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1998 Volume 15 Issue 1
1998, 15(1): 1-4
Abstract:
Hydration of sulfonate in water/AOT/n-heptane (AOT=sodium bis (2-ethylhexyl) sulfosuccinate) microemulsion system has been investigated by means of FT-IR. The results show that the hydration of sulfonate in the system leads to a shift of symmetric sulfonate stretching mode from 1051.39 cm-1 to 1046.15 cm-1 in the infrared spectra with the increase of the molar ratio of water to AOT, W0. The formation of microemulsions weakens the interaction between counterion Na+ and -SO3-, groups, compared with that in the solid state AOT. The splitting of the antisymmetric sulfonate stretching mode in the in-frared spectra reduces from ca. 42 cm-1 to 29 cm-1 upon the addition of water into the sys-tem. The intensity of ~1215 cm-1 increases, while the peak of ~1245 cm-1 decreases corre-spondingly with the increase of W0.
Hydration of sulfonate in water/AOT/n-heptane (AOT=sodium bis (2-ethylhexyl) sulfosuccinate) microemulsion system has been investigated by means of FT-IR. The results show that the hydration of sulfonate in the system leads to a shift of symmetric sulfonate stretching mode from 1051.39 cm-1 to 1046.15 cm-1 in the infrared spectra with the increase of the molar ratio of water to AOT, W0. The formation of microemulsions weakens the interaction between counterion Na+ and -SO3-, groups, compared with that in the solid state AOT. The splitting of the antisymmetric sulfonate stretching mode in the in-frared spectra reduces from ca. 42 cm-1 to 29 cm-1 upon the addition of water into the sys-tem. The intensity of ~1215 cm-1 increases, while the peak of ~1245 cm-1 decreases corre-spondingly with the increase of W0.
1998, 15(1): 5-8
Abstract:
The interaction of RE ions(Ⅲ) with bovine serum albumin(BSA) has been stud-ied by UV spectrometry. It was found that the absorption of BSA at near 280 nm was en-hanced by RE ions. Ultraviolet spectra showed that the coordination atoms of BSA to RE ions are oxygen atoms, RE ions were coordinated with carboxyl groups of amino acids and carbonyl groups of the peptide bonds on the out-shell of BSA.
The interaction of RE ions(Ⅲ) with bovine serum albumin(BSA) has been stud-ied by UV spectrometry. It was found that the absorption of BSA at near 280 nm was en-hanced by RE ions. Ultraviolet spectra showed that the coordination atoms of BSA to RE ions are oxygen atoms, RE ions were coordinated with carboxyl groups of amino acids and carbonyl groups of the peptide bonds on the out-shell of BSA.
1998, 15(1): 9-12
Abstract:
Twenty novel pyrethroid oxime-esters were synthesized. Their structures were confirmed by elemental analysis and 1H NMR. The bioassay indicated that compounds 5a and 5f showed a higher antiviral activity.
Twenty novel pyrethroid oxime-esters were synthesized. Their structures were confirmed by elemental analysis and 1H NMR. The bioassay indicated that compounds 5a and 5f showed a higher antiviral activity.
1998, 15(1): 13-16
Abstract:
Nanometer order bismuth doped chemical manganese dioxide (nm-Bi-CMD) was prepared by sol-gel method. The results of XRD, TEM, ICP measurements and chemical analysis showed that the sample was of γ-type crystal structure, and in nano size. Mixing the nm-Bi-CMD with Bi-EMD(electrolytic maganese dioxide) in optimum weight ratio in-creased the charge/discharge performance of the products. Cycle volrammogram, AC con-ductivity and AC impedance measurements showed that the doping of nm-Bi-CMD, decreas-ing the resistance between crystal grains of the doped samples, raised the surface roughness and improved the stability of the electrode surface.
Nanometer order bismuth doped chemical manganese dioxide (nm-Bi-CMD) was prepared by sol-gel method. The results of XRD, TEM, ICP measurements and chemical analysis showed that the sample was of γ-type crystal structure, and in nano size. Mixing the nm-Bi-CMD with Bi-EMD(electrolytic maganese dioxide) in optimum weight ratio in-creased the charge/discharge performance of the products. Cycle volrammogram, AC con-ductivity and AC impedance measurements showed that the doping of nm-Bi-CMD, decreas-ing the resistance between crystal grains of the doped samples, raised the surface roughness and improved the stability of the electrode surface.
1998, 15(1): 17-21
Abstract:
Zirconium phosphite-polyvinylpyrrolidone (Zr(HPO3)2·H2O-PVP) supporter and corresponding palladium catalysts were prepared and characterized by IR, TG, DTA, BET surface area and XPS measurements, The immobilized PVP on the supporter amounted to 41 to 51 gram per mol Zr(HPO3)2·H2O. The Zr(HPO3)2·H2O-PVP-Pd catalysts exhibit high activities: in hydrogenation of 7 tested substituted olefins and nitrobenzene under atmospher-ic pressure the conversions were above 97.3%. The influences of crystallization time, Pd%, VP unit/Pd ratio, catalyst amount used in the hydrogenation, reaction temperature, sol-vents, pH of the media and substractes on the catalytic activity were examined. The cata-lysts can be used for 15 times without serious loss of the activity. The comparation of the catalyst with Zr(HPO4)2·H2O-PVP-Pd is also described.
Zirconium phosphite-polyvinylpyrrolidone (Zr(HPO3)2·H2O-PVP) supporter and corresponding palladium catalysts were prepared and characterized by IR, TG, DTA, BET surface area and XPS measurements, The immobilized PVP on the supporter amounted to 41 to 51 gram per mol Zr(HPO3)2·H2O. The Zr(HPO3)2·H2O-PVP-Pd catalysts exhibit high activities: in hydrogenation of 7 tested substituted olefins and nitrobenzene under atmospher-ic pressure the conversions were above 97.3%. The influences of crystallization time, Pd%, VP unit/Pd ratio, catalyst amount used in the hydrogenation, reaction temperature, sol-vents, pH of the media and substractes on the catalytic activity were examined. The cata-lysts can be used for 15 times without serious loss of the activity. The comparation of the catalyst with Zr(HPO4)2·H2O-PVP-Pd is also described.
1998, 15(1): 22-24
Abstract:
Phenyl was introduced into hexachlorocyclotriphosphazene by Friedel-Crafts reac-tion and the title compound was synthesized by nucleophilic substitution and hydrogenation reaction. Its structure was characterized by elemental anlaysis, IR, NMR and MS measure-ments.
Phenyl was introduced into hexachlorocyclotriphosphazene by Friedel-Crafts reac-tion and the title compound was synthesized by nucleophilic substitution and hydrogenation reaction. Its structure was characterized by elemental anlaysis, IR, NMR and MS measure-ments.
1998, 15(1): 25-28
Abstract:
Three anthraquinone dyes containing carboxymethylsulfonyl group and relative in-termediates were synthesized. Thermogravimetry was applied to determine the decarboxyla-tion temperatures of the dyes and intermediates. The results show that decarboxylation tem-peratures decreased when carboxymethylsulfonyl groups connected indirectly with benzene ring.
Three anthraquinone dyes containing carboxymethylsulfonyl group and relative in-termediates were synthesized. Thermogravimetry was applied to determine the decarboxyla-tion temperatures of the dyes and intermediates. The results show that decarboxylation tem-peratures decreased when carboxymethylsulfonyl groups connected indirectly with benzene ring.
1998, 15(1): 29-32
Abstract:
The thermochemical characteristics of the inhibiting action of Na2SeO3 on the growth metabolism of four microbes:Escherichia coli, Bacillus subtilis, Aerobacter aerogenes and Rhizopus nigricans has been studied by microcalorimetry. It was found that Na2SeO3 of concentration less than 10 mg/L had promoting action on the growth of the cells, and that of more than this concentration had inhibiting action, which, in addition, varies with the kinds of the microbes.
The thermochemical characteristics of the inhibiting action of Na2SeO3 on the growth metabolism of four microbes:Escherichia coli, Bacillus subtilis, Aerobacter aerogenes and Rhizopus nigricans has been studied by microcalorimetry. It was found that Na2SeO3 of concentration less than 10 mg/L had promoting action on the growth of the cells, and that of more than this concentration had inhibiting action, which, in addition, varies with the kinds of the microbes.
1998, 15(1): 33-36
Abstract:
The surface properties of the segmented ternary copolymers [-PSF-PDMS-PHS-]n have been investigated by XPS, DMA, TEM and SEM techniques, where PSF:polysulfone, PDMS:polydimethylsiloxane, PHS:poly-p-hydroxystyrene. It is shown that for all copolymers of different composition PDMS soft segments were enriched on the surface and the enrichment increased with the increase of the content of PDMS of the copolymer, but decreased with the solubility parameter of the solvents tested. Treating with H2O gave high-er enrichment of PDMS than that of the blank.
The surface properties of the segmented ternary copolymers [-PSF-PDMS-PHS-]n have been investigated by XPS, DMA, TEM and SEM techniques, where PSF:polysulfone, PDMS:polydimethylsiloxane, PHS:poly-p-hydroxystyrene. It is shown that for all copolymers of different composition PDMS soft segments were enriched on the surface and the enrichment increased with the increase of the content of PDMS of the copolymer, but decreased with the solubility parameter of the solvents tested. Treating with H2O gave high-er enrichment of PDMS than that of the blank.
1998, 15(1): 37-40
Abstract:
The highly pure、superfine and monosize-distribution strontium titanate crys-talline particles have been synthesized by fractional precipitation, when titanium tetrachlo-ride and strontium chloride were used as raw materials and urea and sodium hydroxide as precipitation agents. The influences of the precipitation agents on formation of the particles and properties of the powders have been discussed. The results show that urea as the first precipitation agent improves the sphericity of the particles and monosize-distribution. Sodi-um hydroxide as precipitation agent is favarable to the crystallization and yield of strontium titanate. Particle sizes down to 30 nm on average were obtained. The powders show a goodsinterability.
The highly pure、superfine and monosize-distribution strontium titanate crys-talline particles have been synthesized by fractional precipitation, when titanium tetrachlo-ride and strontium chloride were used as raw materials and urea and sodium hydroxide as precipitation agents. The influences of the precipitation agents on formation of the particles and properties of the powders have been discussed. The results show that urea as the first precipitation agent improves the sphericity of the particles and monosize-distribution. Sodi-um hydroxide as precipitation agent is favarable to the crystallization and yield of strontium titanate. Particle sizes down to 30 nm on average were obtained. The powders show a goodsinterability.
1998, 15(1): 41-43
Abstract:
The distribution coefficients of hydrocortisone in some solvent/water systems in-dicate that hydrocortisone has a stronger hydrogen bonds with alcohols and ketones, but comparatively weak hydrogen bonds with esters, ethers and chlorocarbons. Hydrocortisone can hardly form hydrogen bonding interaction with tetrachloromethane, benzene, and cyclo-hexane.
The distribution coefficients of hydrocortisone in some solvent/water systems in-dicate that hydrocortisone has a stronger hydrogen bonds with alcohols and ketones, but comparatively weak hydrogen bonds with esters, ethers and chlorocarbons. Hydrocortisone can hardly form hydrogen bonding interaction with tetrachloromethane, benzene, and cyclo-hexane.
1998, 15(1): 44-46
Abstract:
The correlation distance ac and integration invariant Q of the blends of polystyrene with cis-polybutadiene-g-styrene in melt-mixing have been assessed through small angle light scattering and small angle X-ray scattering investigations. The changes of the phase struc-ture of the blends with blending time have been examined by SEM.
The correlation distance ac and integration invariant Q of the blends of polystyrene with cis-polybutadiene-g-styrene in melt-mixing have been assessed through small angle light scattering and small angle X-ray scattering investigations. The changes of the phase struc-ture of the blends with blending time have been examined by SEM.
1998, 15(1): 47-49
Abstract:
The anti-AFP antibody is immobilized on the surface of PVC-BSA(bovine serum albumin) membrane, which has been activated by NH2OH · HCl solution. The immunosen-sor consists of such a membrane with added AFP and Ag-AgCl internal electrode. It showed linear response over concentration range of 10-300μg/L and potential difference(△E) of 15~20 mV for 300μg/L of AFP. Other common antigens in human serum do not interfere with AFP's determination.
The anti-AFP antibody is immobilized on the surface of PVC-BSA(bovine serum albumin) membrane, which has been activated by NH2OH · HCl solution. The immunosen-sor consists of such a membrane with added AFP and Ag-AgCl internal electrode. It showed linear response over concentration range of 10-300μg/L and potential difference(△E) of 15~20 mV for 300μg/L of AFP. Other common antigens in human serum do not interfere with AFP's determination.
1998, 15(1): 50-52
Abstract:
Six soluble quinone-amine polymers (PAQs) were synthesized from p-benzo-quinone with α, ω-diaminoalkoxypolymethylsiloxa, α, ω-diaminopropylpolymethylsiloxa, isophorone diamine, polyether-ester-amide type diamine and two kinds of disecondary amine, respectively. Their spectral properties and elemental analysis results are reported.
Six soluble quinone-amine polymers (PAQs) were synthesized from p-benzo-quinone with α, ω-diaminoalkoxypolymethylsiloxa, α, ω-diaminopropylpolymethylsiloxa, isophorone diamine, polyether-ester-amide type diamine and two kinds of disecondary amine, respectively. Their spectral properties and elemental analysis results are reported.
1998, 15(1): 53-55
Abstract:
The thiol group of glutathione (GSH) was protected by 2, 4-dinitrochlorobenzene (DNCB). The product GSH-S-DNP was reacted with 2-methyl-1-propanol and 3-methyl-1-butanol respectively to obtain hapten 6 and 7. Their structures were determined by 400 MHz 1H NMR and IR. The two haptens were then covalently crosslinked with bovine serum albu-min(BSA) hy using glutaraldehyde as coupling agent to obtain antigen 6 and 7. The results of gel electrophoresis analysis gave the average molecular weight of 1.27 × 10-22 kg for each antigen. The average connected ratio of BSA to hapten was 1:12. Other UV and fluores-cence spectral properties of the antigens are reported.
The thiol group of glutathione (GSH) was protected by 2, 4-dinitrochlorobenzene (DNCB). The product GSH-S-DNP was reacted with 2-methyl-1-propanol and 3-methyl-1-butanol respectively to obtain hapten 6 and 7. Their structures were determined by 400 MHz 1H NMR and IR. The two haptens were then covalently crosslinked with bovine serum albu-min(BSA) hy using glutaraldehyde as coupling agent to obtain antigen 6 and 7. The results of gel electrophoresis analysis gave the average molecular weight of 1.27 × 10-22 kg for each antigen. The average connected ratio of BSA to hapten was 1:12. Other UV and fluores-cence spectral properties of the antigens are reported.
1998, 15(1): 56-58
Abstract:
Prolamins from thirteen kinds of homemade rice seed have been preliminary stu-dled by capillary zone electrophoresis(CZE). The results showed that CZE can be used as a supplement method for comparing and differentiating the rice cultivars, especially some hy-brids, which are difficult to differentiate by polyacrylamide gel electrophoresis.
Prolamins from thirteen kinds of homemade rice seed have been preliminary stu-dled by capillary zone electrophoresis(CZE). The results showed that CZE can be used as a supplement method for comparing and differentiating the rice cultivars, especially some hy-brids, which are difficult to differentiate by polyacrylamide gel electrophoresis.
1998, 15(1): 59-61
Abstract:
The capillary flow property and processability of the title plastics (PEK-C) have been investigated using capillary rheometer. The dependence of the viscosity on the wall shear rate and temperature were obtained. The swelling of the extrudate was measured and the fracture phenomena of the extrudate were discussed.
The capillary flow property and processability of the title plastics (PEK-C) have been investigated using capillary rheometer. The dependence of the viscosity on the wall shear rate and temperature were obtained. The swelling of the extrudate was measured and the fracture phenomena of the extrudate were discussed.
1998, 15(1): 62-64
Abstract:
Ring-opening polymerization of D,L-lactide has been successfully carried out by (ArO)2Sm(THF)4 (ArO=2, 6-ditertbutyl(4-methylphenoxo-) as catalyst for the first time. The catalyst contentration, monomer concentration and solvent showed a marked effect on the polymerization. The polymerization rate decrease with increase of monomer concentra-tion and decrease of catalyst concentration. The initiation mechanism has been discussed ac-cording to the results of end-group analysis of oligomer by IR. The active species are sup-posed to be a samarium enolate formed from the reaction of (ArO)2Sm(THF)4 with lactide.
Ring-opening polymerization of D,L-lactide has been successfully carried out by (ArO)2Sm(THF)4 (ArO=2, 6-ditertbutyl(4-methylphenoxo-) as catalyst for the first time. The catalyst contentration, monomer concentration and solvent showed a marked effect on the polymerization. The polymerization rate decrease with increase of monomer concentra-tion and decrease of catalyst concentration. The initiation mechanism has been discussed ac-cording to the results of end-group analysis of oligomer by IR. The active species are sup-posed to be a samarium enolate formed from the reaction of (ArO)2Sm(THF)4 with lactide.
1998, 15(1): 65-67
Abstract:
Sodium β/β"-Al2O3 films were prepared by the reaction of spinel-α-Al2O3 compo-site substrate with Li2O and Na2O vapour. The influnences of MgO added to the substrates on the phase composition and electrical conduction property of the films were investigated. The results showed that the addition of MgO to the substrate in weight ≤1% ~2% could en-hance the β"-Al2O3 phase content and there fore improve the ionic conductivity of the film.
Sodium β/β"-Al2O3 films were prepared by the reaction of spinel-α-Al2O3 compo-site substrate with Li2O and Na2O vapour. The influnences of MgO added to the substrates on the phase composition and electrical conduction property of the films were investigated. The results showed that the addition of MgO to the substrate in weight ≤1% ~2% could en-hance the β"-Al2O3 phase content and there fore improve the ionic conductivity of the film.
1998, 15(1): 68-70
Abstract:
The charge transport rate in polyaniline, which was obtained through electropoly-merization by cyclic voltammetry, was evaluated by the square wave voltammetry and the time of scale of voltammetry was defined by AC impedance technique. The results show that the charge transport in polyaniline is controlled by diffusion. The Dapp and k0 of the redox re-action are determined by COOL algorithm by means of the fast scanning and sampling of the square wave voltammetry.
The charge transport rate in polyaniline, which was obtained through electropoly-merization by cyclic voltammetry, was evaluated by the square wave voltammetry and the time of scale of voltammetry was defined by AC impedance technique. The results show that the charge transport in polyaniline is controlled by diffusion. The Dapp and k0 of the redox re-action are determined by COOL algorithm by means of the fast scanning and sampling of the square wave voltammetry.
1998, 15(1): 71-73
Abstract:
The results from dynamic viscoelastomer, TEM and others showed that the ABS/PVC blends are partially compatible system. The morphological structure of the blends is in deep dependence on the segment compatibility. The interface between the phases plays an important role in mechanical property of the blends.
The results from dynamic viscoelastomer, TEM and others showed that the ABS/PVC blends are partially compatible system. The morphological structure of the blends is in deep dependence on the segment compatibility. The interface between the phases plays an important role in mechanical property of the blends.
1998, 15(1): 74-76
Abstract:
Excellent quality ultrathin TiO2 films were obtained from tetrabutyl titanate and arachidic acid by a two-dimensional sol-gel process, followed with thermal decomposition of the complex multilayer Langnuirblodgett films. The UV-vis spectra of the multilayer films showed a blue shift of the absorption band relative to those of bulk TiO2, inlplying the for-mation of nanoparticles of TiO2-based condensates. Their uniformity and rutile type struc-ture were revealed by TEM and XRD results.
Excellent quality ultrathin TiO2 films were obtained from tetrabutyl titanate and arachidic acid by a two-dimensional sol-gel process, followed with thermal decomposition of the complex multilayer Langnuirblodgett films. The UV-vis spectra of the multilayer films showed a blue shift of the absorption band relative to those of bulk TiO2, inlplying the for-mation of nanoparticles of TiO2-based condensates. Their uniformity and rutile type struc-ture were revealed by TEM and XRD results.
1998, 15(1): 77-79
Abstract:
The titanium hydride was prepared in quartz tube reactor. Its formation and de-composition were examined by SEM, XRD and DTA. The results show that in about 350 C, hydrogen and titanium can be fast combined into titanium hydride which mainly in irreg-ular polyhedron particles of 1~40 μm size, and in 680 ℃ the titanium hydride can be decom-posed producing hydrogen. The relationship between the partial pressure of hydrogen and temperature was researched through thermodynamic discussion.
The titanium hydride was prepared in quartz tube reactor. Its formation and de-composition were examined by SEM, XRD and DTA. The results show that in about 350 C, hydrogen and titanium can be fast combined into titanium hydride which mainly in irreg-ular polyhedron particles of 1~40 μm size, and in 680 ℃ the titanium hydride can be decom-posed producing hydrogen. The relationship between the partial pressure of hydrogen and temperature was researched through thermodynamic discussion.
1998, 15(1): 80-82
Abstract:
EDTA was used to complex nickel to make the separation of trace amount of nick-el and cobalt possible by an emulsion liquid membrane containing P507-Span80-liquid paraf-fin-kerosene-HCl. Good results were obtained under conditions:pH=4.6 ~ 5.2, ratio of emulsion to solution=0.1, and separation time ca. 20 min. Separated cobalt and nickel could be easily determined by spectrophotometer. Under these conditions the recoveries of cobalt and nickel were more than 95% and 13%, respectively, the coefficient of separation was over 130. Membrane phase could be reused repeatedly. Among the coexisting ions, only Ca2+ and Cu2+ affect the separation.
EDTA was used to complex nickel to make the separation of trace amount of nick-el and cobalt possible by an emulsion liquid membrane containing P507-Span80-liquid paraf-fin-kerosene-HCl. Good results were obtained under conditions:pH=4.6 ~ 5.2, ratio of emulsion to solution=0.1, and separation time ca. 20 min. Separated cobalt and nickel could be easily determined by spectrophotometer. Under these conditions the recoveries of cobalt and nickel were more than 95% and 13%, respectively, the coefficient of separation was over 130. Membrane phase could be reused repeatedly. Among the coexisting ions, only Ca2+ and Cu2+ affect the separation.
1998, 15(1): 83-85
Abstract:
The trace manganese in APM has been determined by graphite probe furnace atomic absorption spectrometry after it was directly collected with graphite probe filters. The characteristic mass and detection limit(3σ) were 9.96 pg and 11.69 pg, respectively.
The trace manganese in APM has been determined by graphite probe furnace atomic absorption spectrometry after it was directly collected with graphite probe filters. The characteristic mass and detection limit(3σ) were 9.96 pg and 11.69 pg, respectively.
1998, 15(1): 86-88
Abstract:
1-Naphthalene acetic acid was synthesized from 1-chloromethyl naphthalene by octacarbonyl dicobalt under phase transfer catalytic conditions. Conversion was 99% and yield 83%. The effects of reaction temperatures, ratios of reactants, solvents, contents of catalyst and concentration of alkali on conversion have been investigated. Among the phase transfer catalysts tested, the most effective was hexadecyltrimethylammonium chloride.
1-Naphthalene acetic acid was synthesized from 1-chloromethyl naphthalene by octacarbonyl dicobalt under phase transfer catalytic conditions. Conversion was 99% and yield 83%. The effects of reaction temperatures, ratios of reactants, solvents, contents of catalyst and concentration of alkali on conversion have been investigated. Among the phase transfer catalysts tested, the most effective was hexadecyltrimethylammonium chloride.
1998, 15(1): 89-91
Abstract:
The extraction mechanism of Sr(Ⅱ) from HNO3 medium with HEH/EHP in n-oc-tane has been investigated by a two-phase titration method and the extracted complex has been determined to be SrA2 · 3.9HA. The extraction equilibrium constant calculated was logKex=-5.42.
The extraction mechanism of Sr(Ⅱ) from HNO3 medium with HEH/EHP in n-oc-tane has been investigated by a two-phase titration method and the extracted complex has been determined to be SrA2 · 3.9HA. The extraction equilibrium constant calculated was logKex=-5.42.
1998, 15(1): 92-94
Abstract:
The effective preparation of rare-earth metallofullerenes is described. Graphite rod blended with rare earth oxide was used as starting material. The method consists of dou-ble are discharge, extraction with toluene in Soxhlet extractor and extraction with pyridine at high temperature and pressure. The laser desorption time-of-flight mass spectrometry (LD-TOF MS) results showed that the more important factors influencing the formation of rare earth metallofullerenes appeared the conditions of their preparation and extraction and va-lence states of rare earth elements themselves.
The effective preparation of rare-earth metallofullerenes is described. Graphite rod blended with rare earth oxide was used as starting material. The method consists of dou-ble are discharge, extraction with toluene in Soxhlet extractor and extraction with pyridine at high temperature and pressure. The laser desorption time-of-flight mass spectrometry (LD-TOF MS) results showed that the more important factors influencing the formation of rare earth metallofullerenes appeared the conditions of their preparation and extraction and va-lence states of rare earth elements themselves.
1998, 15(1): 95-97
Abstract:
Ten N-phenylacetyl-N'-arylthioureas were synthesized using phase transfer cata-lyst PEG-400 under ultrasonic irradiation. Their structures were characterized by IR, 1H NMR and elemental analysis. The method has advantages of good yield, short reaction time, easy operation and mild reaction conditions.
Ten N-phenylacetyl-N'-arylthioureas were synthesized using phase transfer cata-lyst PEG-400 under ultrasonic irradiation. Their structures were characterized by IR, 1H NMR and elemental analysis. The method has advantages of good yield, short reaction time, easy operation and mild reaction conditions.
1998, 15(1): 98-100
Abstract:
A series of sulfonated polydioxolane were prepared from dioxolane using cis 2-butene-1, 4-diol and BF3 · O(C2H5)2 as monofer and initiator and characterized by FT-IR, 1H NMR, GPC and elemental analysis. A simple method is described for seperation of highly ionized polyether from the products of the addition reaction.
A series of sulfonated polydioxolane were prepared from dioxolane using cis 2-butene-1, 4-diol and BF3 · O(C2H5)2 as monofer and initiator and characterized by FT-IR, 1H NMR, GPC and elemental analysis. A simple method is described for seperation of highly ionized polyether from the products of the addition reaction.
1998, 15(1): 101-103
Abstract:
Core/shell type acrylic-polyurethane hybrid microemulsions in which polyurethane as the shell and acrylic polymer as the core were prepared successfully. Different cross-link-ing structures between core and shell can be formed by introducing hydroethyl acrylate and adipoyl dihydrazine at the ends of the polyurethane chains. The photon correlation spec-troscopy studies revealed that the mean particle size of the emulsions were smaller than 200 nm. The particle morphology results revealed the core/shell structure of the uncross-linking type microemulsions and interpenetrating networks of the cross-linking type microemulsions.
Core/shell type acrylic-polyurethane hybrid microemulsions in which polyurethane as the shell and acrylic polymer as the core were prepared successfully. Different cross-link-ing structures between core and shell can be formed by introducing hydroethyl acrylate and adipoyl dihydrazine at the ends of the polyurethane chains. The photon correlation spec-troscopy studies revealed that the mean particle size of the emulsions were smaller than 200 nm. The particle morphology results revealed the core/shell structure of the uncross-linking type microemulsions and interpenetrating networks of the cross-linking type microemulsions.
1998, 15(1): 104-106
Abstract:
Trace amount of cobalt in molecular sieve was determined by simple differential oscillographic voltammtry in Co-PAR system (PAR=4-(2-pyridylazo) resorcinol). Results showed that in a solution of 0.2 mol/L HAc-0.2 mol/L NaAc-2.5 × 10-5 mol/L PAR (pH=4.7) cobalt was able to cause a sharp incision on the cathodeic branch of the oscillogram at -1.68 V(vs. SCE). The method is simple, rapid and has less interferences than spectropho-tometry.
Trace amount of cobalt in molecular sieve was determined by simple differential oscillographic voltammtry in Co-PAR system (PAR=4-(2-pyridylazo) resorcinol). Results showed that in a solution of 0.2 mol/L HAc-0.2 mol/L NaAc-2.5 × 10-5 mol/L PAR (pH=4.7) cobalt was able to cause a sharp incision on the cathodeic branch of the oscillogram at -1.68 V(vs. SCE). The method is simple, rapid and has less interferences than spectropho-tometry.
1998, 15(1): 107-109
Abstract:
Tetraacetyl glucosyl ester of o-carboxybenzoylferrocene was synthesized and char-acterized by IR, 1H NMR, MS measurements and elemental analysis. Its antianemia proper-ty has been tested.
Tetraacetyl glucosyl ester of o-carboxybenzoylferrocene was synthesized and char-acterized by IR, 1H NMR, MS measurements and elemental analysis. Its antianemia proper-ty has been tested.
1998, 15(1): 110-112
Abstract:
Six isochromano [4,3-c]pyrazole derivatives were synthesized from isochroman-4-one as starting compound. Some of the products show a significant anti-inflammatory activi-ty.
Six isochromano [4,3-c]pyrazole derivatives were synthesized from isochroman-4-one as starting compound. Some of the products show a significant anti-inflammatory activi-ty.
1998, 15(1): 113-115
Abstract:
Graft copolymerization of acrylonitrile onto ramie fibers has been carried out with chromic acid as initiator. The effects of the concentrations of chromic acid, AN and H+ as well as temperature an a time of polymerlzation on the graft ratio, yield of homopolymer have been examined. The optimum conditions of grafting are:concentration of chromic acid 6 × 10-3 mol/L, of AN 2.0 mol/L, of H+ 0.8 mol/L, temperature 40 ℃ and time 20 h.
Graft copolymerization of acrylonitrile onto ramie fibers has been carried out with chromic acid as initiator. The effects of the concentrations of chromic acid, AN and H+ as well as temperature an a time of polymerlzation on the graft ratio, yield of homopolymer have been examined. The optimum conditions of grafting are:concentration of chromic acid 6 × 10-3 mol/L, of AN 2.0 mol/L, of H+ 0.8 mol/L, temperature 40 ℃ and time 20 h.
1998, 15(1): 116-118
Abstract:
Sodium tetracarbonyl cobaltate was prepared by reaction of CO with CoCl2 in CH3OH, using Urushibara-Cobalt (U-Co) as activator and characterized by IR spectrometry. The optimum conditions were: Co(from U-Co)/CoCl2=0.6; 30 ℃; 0.1 MPa of CO. The convertion of CoCl2 in 3 h of reaction was 96%. The convertion of benzyl chloride to pheny-lacetic acid using the Na[Co(CO)4] as catalyst was about 90% at 50℃ and 0.1 MPa of CO.
Sodium tetracarbonyl cobaltate was prepared by reaction of CO with CoCl2 in CH3OH, using Urushibara-Cobalt (U-Co) as activator and characterized by IR spectrometry. The optimum conditions were: Co(from U-Co)/CoCl2=0.6; 30 ℃; 0.1 MPa of CO. The convertion of CoCl2 in 3 h of reaction was 96%. The convertion of benzyl chloride to pheny-lacetic acid using the Na[Co(CO)4] as catalyst was about 90% at 50℃ and 0.1 MPa of CO.
