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1999 Volume 16 Issue 6
1999, 16(6): 1-4
Abstract:
Epoxy resin of bisphenol A type(ER)/polycarbonate(PC) blends cured with 4, 4'-diaminodiphenyl sulfone(DDS) were prepared.Dynamic mechanical analysis showed that the DDS-cured ER/PC blends had only single Tg, indicating the cured blend system is of single-phase.SEM also revealed the homogeneity of the blends.An interesterification reaction between ER and PC in the blends could be concluded from the observations of the shift to low frequencies of the streching vibration bands of carbonyl group of the blends.Addition of PC had little influence on the modulus, tensile strength, tensile elongation and fracture toughness of the blends, which could be ascribed to the phase structure and interesterification occurred during the preparation of the blends.
Epoxy resin of bisphenol A type(ER)/polycarbonate(PC) blends cured with 4, 4'-diaminodiphenyl sulfone(DDS) were prepared.Dynamic mechanical analysis showed that the DDS-cured ER/PC blends had only single Tg, indicating the cured blend system is of single-phase.SEM also revealed the homogeneity of the blends.An interesterification reaction between ER and PC in the blends could be concluded from the observations of the shift to low frequencies of the streching vibration bands of carbonyl group of the blends.Addition of PC had little influence on the modulus, tensile strength, tensile elongation and fracture toughness of the blends, which could be ascribed to the phase structure and interesterification occurred during the preparation of the blends.
1999, 16(6): 5-8
Abstract:
The carbonized resin support has been prepared.The Ni catalysts have been prepared by isometric impregnation of Ni(NO3)2 solution with carbonized resin support using ethylenediamine as solvent.Their superficial structures have been characterized by BET, SEM, XRD and TEM techniques.The reaction behavior of Ni supported on the carbonized resin in hydrodechlorination of 1, 2-dichloropropane to propene have been evaluated in a microreactor.The results show that the carbonized resin after activation has a specific area of 611 m2/g, the nickel supported on the resin has an average crystal size of 30 um and distributes uniformly.Over the activated carbonized resin supported nickel catalyst for hydrodechlorination of 1, 2-dichloropropane the latter has conversion more than 68% with the selectivity to propene being 100% under proper reaction conditions.
The carbonized resin support has been prepared.The Ni catalysts have been prepared by isometric impregnation of Ni(NO3)2 solution with carbonized resin support using ethylenediamine as solvent.Their superficial structures have been characterized by BET, SEM, XRD and TEM techniques.The reaction behavior of Ni supported on the carbonized resin in hydrodechlorination of 1, 2-dichloropropane to propene have been evaluated in a microreactor.The results show that the carbonized resin after activation has a specific area of 611 m2/g, the nickel supported on the resin has an average crystal size of 30 um and distributes uniformly.Over the activated carbonized resin supported nickel catalyst for hydrodechlorination of 1, 2-dichloropropane the latter has conversion more than 68% with the selectivity to propene being 100% under proper reaction conditions.
1999, 16(6): 9-12
Abstract:
Monodisperse nanocrystalline Y2O3 in size 30 um was prepared in "microreactors" of reverse micelles and microemulsions, formed from cetyltrimethyl ammonium bromide, butanol and Y(NO3)3 in cyclohexane.The mechanism of the crystalline formation has been discussed based on the results of TG-DTA, XRD and TEM measurements.The addition of butanol showed a great influence on the stability of the microreactor membrane.The optimum content of butanol was found.The size of Y2O3 depended on the calcination temperature: the higher the temperature, the larger the nanocrystalline.
Monodisperse nanocrystalline Y2O3 in size 30 um was prepared in "microreactors" of reverse micelles and microemulsions, formed from cetyltrimethyl ammonium bromide, butanol and Y(NO3)3 in cyclohexane.The mechanism of the crystalline formation has been discussed based on the results of TG-DTA, XRD and TEM measurements.The addition of butanol showed a great influence on the stability of the microreactor membrane.The optimum content of butanol was found.The size of Y2O3 depended on the calcination temperature: the higher the temperature, the larger the nanocrystalline.
1999, 16(6): 13-16
Abstract:
A series of transition metal substituted β-alumina oxides, BaMAl11O19-δ(M=Fe, Co,Ni, Mn, Cu) were prepared.The structures and characteristics of the catalysts were investigated by XRD, XPS and TPR techniques.The catalysts were identified to have almost the same β-alumina crystal structure, but exhibited different reducibility and catalytic activities for CO2 reforming of methane to syngas in close relation to the crystal structure and characteristics of the transition metal in β-alumina oxides lattices.Among the β-alumina oxides, BaMAl11O19-δ showed significant catalytic activity and stability without sintering and deactivation.When reforming was carried out at 780℃ for 2 h the conversion of CH4 and CO2 reached 96.6% and 94.8%,respectively.The catalytic activities of other catalysts were much lower than that of BaNiAl11O19-δ.The activity order of the catalysts in view of transition metals was Ni >> Co > Fe > Mn > Cu.
A series of transition metal substituted β-alumina oxides, BaMAl11O19-δ(M=Fe, Co,Ni, Mn, Cu) were prepared.The structures and characteristics of the catalysts were investigated by XRD, XPS and TPR techniques.The catalysts were identified to have almost the same β-alumina crystal structure, but exhibited different reducibility and catalytic activities for CO2 reforming of methane to syngas in close relation to the crystal structure and characteristics of the transition metal in β-alumina oxides lattices.Among the β-alumina oxides, BaMAl11O19-δ showed significant catalytic activity and stability without sintering and deactivation.When reforming was carried out at 780℃ for 2 h the conversion of CH4 and CO2 reached 96.6% and 94.8%,respectively.The catalytic activities of other catalysts were much lower than that of BaNiAl11O19-δ.The activity order of the catalysts in view of transition metals was Ni >> Co > Fe > Mn > Cu.
1999, 16(6): 17-20
Abstract:
The quantum-chemical descriptors and topological indices have been used in QSAR study of pyrones and the algorithms of "Stepwise regression" and "Leaps and bounds regression" are performed for selection of the variables.The results obtained by using the quasi-Newton neural networks are better than that obtained by multiregression.
The quantum-chemical descriptors and topological indices have been used in QSAR study of pyrones and the algorithms of "Stepwise regression" and "Leaps and bounds regression" are performed for selection of the variables.The results obtained by using the quasi-Newton neural networks are better than that obtained by multiregression.
1999, 16(6): 21-24
Abstract:
The complex support of V2O5-SiO2(VSiO)wasprepared by a surface reaction.VsiO supported Cu-Ni catalyst was prepared by anisovolumic impregnation method.The adsorption states and sites of CO2 on the catalyst have been investigated by IR and TPD techniques.Results showed that there are three types of cmemical states of CO2 on the surface of the catalyst: linear,shearing and horizontal.The horizontal adsorption state M-(CO)-O→Vn+ is formed by shearingly adsorbed CO2 on the metal site(M) in coorperation with the adjacent Lewis acid site(Vn+) and can be dissociated into M-CO and V-O- at temperature about 138℃.
The complex support of V2O5-SiO2(VSiO)wasprepared by a surface reaction.VsiO supported Cu-Ni catalyst was prepared by anisovolumic impregnation method.The adsorption states and sites of CO2 on the catalyst have been investigated by IR and TPD techniques.Results showed that there are three types of cmemical states of CO2 on the surface of the catalyst: linear,shearing and horizontal.The horizontal adsorption state M-(CO)-O→Vn+ is formed by shearingly adsorbed CO2 on the metal site(M) in coorperation with the adjacent Lewis acid site(Vn+) and can be dissociated into M-CO and V-O- at temperature about 138℃.
1999, 16(6): 25-28
Abstract:
Ultrafine particles of poly(methyl methacrylate) with diameter of about 21 um and average DP of 340(by GPC) were prepared from the oil-in-water microemulsion of methyl-methyl-metha-cylate-cyclohexane/cetyltrimethylammonium bromide/water system.The factors infiuencing the shapes and sizes of the Polymer particles have been investigated.
Ultrafine particles of poly(methyl methacrylate) with diameter of about 21 um and average DP of 340(by GPC) were prepared from the oil-in-water microemulsion of methyl-methyl-metha-cylate-cyclohexane/cetyltrimethylammonium bromide/water system.The factors infiuencing the shapes and sizes of the Polymer particles have been investigated.
1999, 16(6): 29-32
Abstract:
A novel β-diketone diamine, 1-(4-aminophenyl)-3-(3-aminophenyl)-1, 3-propanedione (1) was prepared by reduction of the corresponding dinitro compound with hydrogen over 10% Pd/C.Five polyimides containing β-dike-tone units in main chain were prepared from the β-diketone diamine and aromatic dianhydrides.The intermediate poly(amic acid)s(3) had inherent viscosities of 0.31-1.00dL/g.The polyimides obtained had glass-transition temperatures between 296℃ and 304℃ (by DSC) and 10% weight loss temperatures above 428℃ in both air and nitrogen atmospheres.
A novel β-diketone diamine, 1-(4-aminophenyl)-3-(3-aminophenyl)-1, 3-propanedione (1) was prepared by reduction of the corresponding dinitro compound with hydrogen over 10% Pd/C.Five polyimides containing β-dike-tone units in main chain were prepared from the β-diketone diamine and aromatic dianhydrides.The intermediate poly(amic acid)s(3) had inherent viscosities of 0.31-1.00dL/g.The polyimides obtained had glass-transition temperatures between 296℃ and 304℃ (by DSC) and 10% weight loss temperatures above 428℃ in both air and nitrogen atmospheres.
1999, 16(6): 33-36
Abstract:
Four complexes: Tb(Ⅲ)-octa-4-n-nonyloxyphthalocyanine (A),Eu(Ⅲ)-ocat-4-tetrehydrofurfuroxyphthalocyanine(B),Tb(Ⅲ)isphthalocyanine(C),Tb(Ⅲ)-ocia-4-nitrophthalocyanine(D) were synthesized and characterized by elemental analysis, IR, MS and UV-Vis spectra.The π-A isotherm data of B Indicates its good film-forming ability.The LB films of B formed on quarz by Y-type technique have good lumlnescence property, which is better with the thickness of the film. The films doped with o-phenanthroline(phen) show a great relative fluorescence in-tensity than purel,B films.Complex B with phen in molar ratio of 1：10 has best fluores-cence behavior.
Four complexes: Tb(Ⅲ)-octa-4-n-nonyloxyphthalocyanine (A),Eu(Ⅲ)-ocat-4-tetrehydrofurfuroxyphthalocyanine(B),Tb(Ⅲ)isphthalocyanine(C),Tb(Ⅲ)-ocia-4-nitrophthalocyanine(D) were synthesized and characterized by elemental analysis, IR, MS and UV-Vis spectra.The π-A isotherm data of B Indicates its good film-forming ability.The LB films of B formed on quarz by Y-type technique have good lumlnescence property, which is better with the thickness of the film. The films doped with o-phenanthroline(phen) show a great relative fluorescence in-tensity than purel,B films.Complex B with phen in molar ratio of 1：10 has best fluores-cence behavior.
1999, 16(6): 37-41
Abstract:
Title compound, a novel ligand, has been synthesized.Its thirteen rare earth complexes have been prepared by reacting the ligand with RE(OH)3 in ethanol-water(1:1) solution.The compositions of the complexes have been determied as REL3·nH2O(RE=La, Pr, Nd, Sm,Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; n=4~6).The compounds have been characterized by elemental analysis, molar conductivity, IR, UV, 1H NMR and DTA-TG measurements.The ligand and complexes have been evaluated for bacteriostatic activity against Escherichia Coil,Staphpococcus aureus and Bacillus subtilis.
Title compound, a novel ligand, has been synthesized.Its thirteen rare earth complexes have been prepared by reacting the ligand with RE(OH)3 in ethanol-water(1:1) solution.The compositions of the complexes have been determied as REL3·nH2O(RE=La, Pr, Nd, Sm,Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu; n=4~6).The compounds have been characterized by elemental analysis, molar conductivity, IR, UV, 1H NMR and DTA-TG measurements.The ligand and complexes have been evaluated for bacteriostatic activity against Escherichia Coil,Staphpococcus aureus and Bacillus subtilis.
1999, 16(6): 42-45
Abstract:
Two kinds of retinyl Schiff base salts and their iron complexes were synthesized and characterized by elemental analysis, IR, 1H NMR and ESR measurements.Both complexes showed microwave absorbability.
Two kinds of retinyl Schiff base salts and their iron complexes were synthesized and characterized by elemental analysis, IR, 1H NMR and ESR measurements.Both complexes showed microwave absorbability.
1999, 16(6): 46-49
Abstract:
The reactive magnetic microspheres with magnetic core and aldehyde groups on surface were prepared by copolymerization of styrene(St) and acrolein(Ac) in an alcohol/water dispersion medium in the presence of magnetite(Fe3O4) particles wrapped up in polyethylene glycol.The composite microspheres have diameters of 1-5μm, with surface aldehyde groups of 0.9-1.52 mmol/g and Fe3O4 content of 0.9-10.0 mg/g.They showed better magnetic responsibility and excellent monodispersity.The effects of the content of magnetite particle, comonomer, initiator and V(EtOH)/V(H2O) ratio, molar ratio of Ac to St on the preparation have been investigated.
The reactive magnetic microspheres with magnetic core and aldehyde groups on surface were prepared by copolymerization of styrene(St) and acrolein(Ac) in an alcohol/water dispersion medium in the presence of magnetite(Fe3O4) particles wrapped up in polyethylene glycol.The composite microspheres have diameters of 1-5μm, with surface aldehyde groups of 0.9-1.52 mmol/g and Fe3O4 content of 0.9-10.0 mg/g.They showed better magnetic responsibility and excellent monodispersity.The effects of the content of magnetite particle, comonomer, initiator and V(EtOH)/V(H2O) ratio, molar ratio of Ac to St on the preparation have been investigated.
1999, 16(6): 50-52
Abstract:
The solvent extraction of butanol has been studied with complexing agents: diisooctyl phosphate, hexanoic acid, octanoic acid and tributyl phophate.The results showed that the distribution ratio of butanol was greatly affected by the concentration of the complexing agents, but slightly by that of butanol.The extraction mechanism has been discussed.
The solvent extraction of butanol has been studied with complexing agents: diisooctyl phosphate, hexanoic acid, octanoic acid and tributyl phophate.The results showed that the distribution ratio of butanol was greatly affected by the concentration of the complexing agents, but slightly by that of butanol.The extraction mechanism has been discussed.
1999, 16(6): 53-55
Abstract:
4A Zeolite has been prepared from Kaolin under low-temperature hydrothermal conditions.The analysis results on the concentration changes of NaOH, SiO2 and Al2O3 in liquid phases as well as the texture, morphology and structure changes of solid phases show that the crystallization process of 4A zeolite roughly comprises three periods: induction of crystal nucleus, crystal growth and steady state transformation.
4A Zeolite has been prepared from Kaolin under low-temperature hydrothermal conditions.The analysis results on the concentration changes of NaOH, SiO2 and Al2O3 in liquid phases as well as the texture, morphology and structure changes of solid phases show that the crystallization process of 4A zeolite roughly comprises three periods: induction of crystal nucleus, crystal growth and steady state transformation.
1999, 16(6): 56-58
Abstract:
The influences of sodium dodecylbenzene sulfonate(SDBS) on the viscosity and surface tension of the copolymer of acrylamide, sodium acrylate and octadecyl dimethylallyl ammonium chloride have been examined.The results showed that the viscosity of the polymer solution increased with addition of SDBS and reached to a maximum value, then decreased with further addition of SDBS.The surface tension of the mixture solution decreased with the increase of SDBS concentration.The results have been discussed.
The influences of sodium dodecylbenzene sulfonate(SDBS) on the viscosity and surface tension of the copolymer of acrylamide, sodium acrylate and octadecyl dimethylallyl ammonium chloride have been examined.The results showed that the viscosity of the polymer solution increased with addition of SDBS and reached to a maximum value, then decreased with further addition of SDBS.The surface tension of the mixture solution decreased with the increase of SDBS concentration.The results have been discussed.
1999, 16(6): 59-61
Abstract:
A series of lanthanide(Ⅲ) complexes of 6-methylpicolinic acid N-oxide(HL) have been synthesized and characterized by elemental analysis, molar conductance, IR, UV spectra and fluorescence spectrum measurements.The compositions of the complexes have been determined as Ln2L6·nH2O(Ln=La, Sm, Eu, Gd, Tb, Dy, n=6; Ln=Lu, n=9).The complexes with Sm, Eu, and Tb have characteristic line fluorescence emission spectra.
A series of lanthanide(Ⅲ) complexes of 6-methylpicolinic acid N-oxide(HL) have been synthesized and characterized by elemental analysis, molar conductance, IR, UV spectra and fluorescence spectrum measurements.The compositions of the complexes have been determined as Ln2L6·nH2O(Ln=La, Sm, Eu, Gd, Tb, Dy, n=6; Ln=Lu, n=9).The complexes with Sm, Eu, and Tb have characteristic line fluorescence emission spectra.
1999, 16(6): 62-64
Abstract:
The hydrogenation of carbon dioxide over Cu-Mo/HZSM-5 composite catalysts prepared by an impregnation method has been studied.The reduction property and adsorption ability of the catalyst towards hydrogen and carbon dioxide have been investigated by TPR and TPD-MS techniques.The results indicated that the addition of Mo increased the activity and dimethyl ether selectivity of Cu/HZSM-5 catalyst, the most active and selective for dimethyl ether was the catalyst with n(Cu)/n(Mo)=5:1.The addition of Mo caused the TPR peaks of Cu/HZSM-5 to move to higher temperatures.CO2-TPD results revealed the raise of the adsorbability of the catalyst toward CO2.
The hydrogenation of carbon dioxide over Cu-Mo/HZSM-5 composite catalysts prepared by an impregnation method has been studied.The reduction property and adsorption ability of the catalyst towards hydrogen and carbon dioxide have been investigated by TPR and TPD-MS techniques.The results indicated that the addition of Mo increased the activity and dimethyl ether selectivity of Cu/HZSM-5 catalyst, the most active and selective for dimethyl ether was the catalyst with n(Cu)/n(Mo)=5:1.The addition of Mo caused the TPR peaks of Cu/HZSM-5 to move to higher temperatures.CO2-TPD results revealed the raise of the adsorbability of the catalyst toward CO2.
1999, 16(6): 65-67
Abstract:
The electrodeposition of Ni-La-P alloy from aqueous solutions of citric acid,phosphorous acid and ammonium chloride has been studied by linear sweep voltammetry.The electroplating potentials of the metallic ions were found shifted to positive region in the presence of complexing agent and phosphorous acid and the Ni2+ ions were favorable for induction of deposition.XPS records indicated the alloy's composition mass fraction as Ni 92, La 2.15, and P 5.85.
The electrodeposition of Ni-La-P alloy from aqueous solutions of citric acid,phosphorous acid and ammonium chloride has been studied by linear sweep voltammetry.The electroplating potentials of the metallic ions were found shifted to positive region in the presence of complexing agent and phosphorous acid and the Ni2+ ions were favorable for induction of deposition.XPS records indicated the alloy's composition mass fraction as Ni 92, La 2.15, and P 5.85.
1999, 16(6): 68-70
Abstract:
An improved model is described to simulate the viscous fingering phenomenon occurred in oil recovery.The random complicated branch-sheeped pattern has been treated on the principles of fractal geometry and the influences of the viscocities of the oil phase and water phase,displacing flow rate, spacing between plate glasses and temperature on the viscous fingering phenomenon have been investigated.The results indicate that the mobility ratio of the aqueous polyacrylamide (PAA) solution to oil is the key to controll the viscous fingering phenomenon, and when the mobility ratio is equal to one or less, the phenomenon occurs little.
An improved model is described to simulate the viscous fingering phenomenon occurred in oil recovery.The random complicated branch-sheeped pattern has been treated on the principles of fractal geometry and the influences of the viscocities of the oil phase and water phase,displacing flow rate, spacing between plate glasses and temperature on the viscous fingering phenomenon have been investigated.The results indicate that the mobility ratio of the aqueous polyacrylamide (PAA) solution to oil is the key to controll the viscous fingering phenomenon, and when the mobility ratio is equal to one or less, the phenomenon occurs little.
1999, 16(6): 71-73
Abstract:
A hydrophobically associating water-soluble viscosifier AOC, a graft copolymer of sodium carboxymethyl cellulose(NaCMC) with acrylamide(AM) and methacryloxyethyldimethyloctyl ammonium bromide (ADMOAB) was synthesized using potassium persulfate and tetramethylethylene diamine as initiators.The composition of the copolymers were analyzed by elemental analysis, and the molecular weight was determined by gel permeation chromatography.Investigations of the viscosity of the copolymers in aqueous solution indicated that AOC has excellent synergistic viscosification properties in relation of salt, temperature and shear rate.
A hydrophobically associating water-soluble viscosifier AOC, a graft copolymer of sodium carboxymethyl cellulose(NaCMC) with acrylamide(AM) and methacryloxyethyldimethyloctyl ammonium bromide (ADMOAB) was synthesized using potassium persulfate and tetramethylethylene diamine as initiators.The composition of the copolymers were analyzed by elemental analysis, and the molecular weight was determined by gel permeation chromatography.Investigations of the viscosity of the copolymers in aqueous solution indicated that AOC has excellent synergistic viscosification properties in relation of salt, temperature and shear rate.
1999, 16(6): 74-76
Abstract:
The dispersion copolmerization fo styrene and glycidyl methacrylate(GMA) in methanol-ethanol mixutre has been studied.The monodisperse particles prepared have sizes ranged in 1.4 to 6.5 μm.The effects of solubility parameter of solvents,reaction temperature and monomer ratio on the copolymer particle formation have been examined.It is found that the greater the solubility parameter difference of the solvent and polymer and the greater the content of GMA,the smaller the size of copolymer particle.When polymerization was carried out at low temperature, small particles were obtained.
The dispersion copolmerization fo styrene and glycidyl methacrylate(GMA) in methanol-ethanol mixutre has been studied.The monodisperse particles prepared have sizes ranged in 1.4 to 6.5 μm.The effects of solubility parameter of solvents,reaction temperature and monomer ratio on the copolymer particle formation have been examined.It is found that the greater the solubility parameter difference of the solvent and polymer and the greater the content of GMA,the smaller the size of copolymer particle.When polymerization was carried out at low temperature, small particles were obtained.
1999, 16(6): 77-79
Abstract:
Eight acetals of 3-trimethylsilylcyclohexanone were synthesized.The structures were determined by 1H NMR、MS and GC.Their characteristic odors were evaluated and found better than that of acetals of 4-trimethylsilylcyclohexanone.
Eight acetals of 3-trimethylsilylcyclohexanone were synthesized.The structures were determined by 1H NMR、MS and GC.Their characteristic odors were evaluated and found better than that of acetals of 4-trimethylsilylcyclohexanone.
1999, 16(6): 80-82
Abstract:
The aluminosiloxane sol was prepared by the reaction of mixture of 2-methylacrylic acid with soldium silicate and aluminium nitrate.A soap-free emulsion polymerization of the methyl methacrylate-K2S2O2-H2O system was carried out using aluminoxane sol to prepare aluminosilox-ane-PMMA.The products were characterized by IR, TGA, DSC, DTA and SEM.The resultis revealed that the surface of aluminosiloxane was chemically bound to the polymer.
The aluminosiloxane sol was prepared by the reaction of mixture of 2-methylacrylic acid with soldium silicate and aluminium nitrate.A soap-free emulsion polymerization of the methyl methacrylate-K2S2O2-H2O system was carried out using aluminoxane sol to prepare aluminosilox-ane-PMMA.The products were characterized by IR, TGA, DSC, DTA and SEM.The resultis revealed that the surface of aluminosiloxane was chemically bound to the polymer.
1999, 16(6): 83-85
Abstract:
A novel cyan coupler, 2-(4-cyanophenyl) ureido-5-{4-[4-(2, 4-ditert-pentyl-phenoxy) butyryl amido] benzene acetamido} phenol (Cp-DY), was prepared from 2-amino-5-nitrophenol.The structure of the cyan coupler was determined by IR, UV, 1H NMR, MS and elemental analysis.Some basic photographic properties of the coupler were examined.
A novel cyan coupler, 2-(4-cyanophenyl) ureido-5-{4-[4-(2, 4-ditert-pentyl-phenoxy) butyryl amido] benzene acetamido} phenol (Cp-DY), was prepared from 2-amino-5-nitrophenol.The structure of the cyan coupler was determined by IR, UV, 1H NMR, MS and elemental analysis.Some basic photographic properties of the coupler were examined.
1999, 16(6): 86-88
Abstract:
Polyphenyl phosphates(PPP) were synthesized by solution polycondensation of phenylphosphate dichloride with biphenol in the presence of pyridine at room temperature.The optimum molar ratio for synthesis was n(-OH);n(-Cl);n(Py)=1.4:1.0:2.4.The structures of PPPs were confirmed by IR and 1HMR.The PPPs with DP of 43~45 possessed good flame retardance(LOI 25.5).The flame retardant property of PPP towards epoxide resin E-44 has been discussed in relation to the DP of the polymers.
Polyphenyl phosphates(PPP) were synthesized by solution polycondensation of phenylphosphate dichloride with biphenol in the presence of pyridine at room temperature.The optimum molar ratio for synthesis was n(-OH);n(-Cl);n(Py)=1.4:1.0:2.4.The structures of PPPs were confirmed by IR and 1HMR.The PPPs with DP of 43~45 possessed good flame retardance(LOI 25.5).The flame retardant property of PPP towards epoxide resin E-44 has been discussed in relation to the DP of the polymers.
1999, 16(6): 89-91
Abstract:
An oligo(polyethylene oxide) of hard segments(HP) was obtained from polyethylene glycol(PEO), 4,4'-diphenylmethanediisocyanate(MDI) and 1,4-butane diol(BD).Aserials of solid polyurethane electrolyte complexes were successfully prepared from the blends of solid polyurethane electrolytes and HP.The solid polyurethane electrolytes included polypropylene oxide polyurethane/NaClO4 electrolyte(PPO-PU/NaClO4), and polyurethane electrolyte with ionized polyethylene oxide segments.FT-IR was used to characterize the samples.Studies on the ionic conductive properties of the samples showed that the ionic conductivities of the polyurethane electrolyte complexes were all much higher than those of their counterparts without HP, and their temperature-conductivity dependence could not be well expressed by Arrhenlus equation.
An oligo(polyethylene oxide) of hard segments(HP) was obtained from polyethylene glycol(PEO), 4,4'-diphenylmethanediisocyanate(MDI) and 1,4-butane diol(BD).Aserials of solid polyurethane electrolyte complexes were successfully prepared from the blends of solid polyurethane electrolytes and HP.The solid polyurethane electrolytes included polypropylene oxide polyurethane/NaClO4 electrolyte(PPO-PU/NaClO4), and polyurethane electrolyte with ionized polyethylene oxide segments.FT-IR was used to characterize the samples.Studies on the ionic conductive properties of the samples showed that the ionic conductivities of the polyurethane electrolyte complexes were all much higher than those of their counterparts without HP, and their temperature-conductivity dependence could not be well expressed by Arrhenlus equation.
1999, 16(6): 92-94
Abstract:
An ultrasonic decomposition of synthetic wastewater containing methanidophos is reported.The effects of power intensity, irradiation time, solution temperature, initial PH, Fe2+ and H2O2 concentrations on the decomposition of methamidophos have been examined.Under the conditions of initial concentration of methamidophos 0.5-5.0×10-4mol/L, PH=2.5-10.8, 30℃, power intensity 80W/cm2, Fe2+ concentration 50 mg/L in 2 h from the oxygen saturated sample solution 99.2% of methamidophos were decomposed according to the COD measurement results.
An ultrasonic decomposition of synthetic wastewater containing methanidophos is reported.The effects of power intensity, irradiation time, solution temperature, initial PH, Fe2+ and H2O2 concentrations on the decomposition of methamidophos have been examined.Under the conditions of initial concentration of methamidophos 0.5-5.0×10-4mol/L, PH=2.5-10.8, 30℃, power intensity 80W/cm2, Fe2+ concentration 50 mg/L in 2 h from the oxygen saturated sample solution 99.2% of methamidophos were decomposed according to the COD measurement results.
1999, 16(6): 95-97
Abstract:
The complexes of Cu with 2-methyl-3-butyn-2-ol(HL) and triphenylphosphine(pph3) or bis (diphenylphophine) methane (dppm) were prepared by an electrochemical method in nonaqueous solutions.The products were characterized by elemental analysis, IR, 1H and 13C NMR measurements as CuL, CuL·pph and CuL.dppm respectively.
The complexes of Cu with 2-methyl-3-butyn-2-ol(HL) and triphenylphosphine(pph3) or bis (diphenylphophine) methane (dppm) were prepared by an electrochemical method in nonaqueous solutions.The products were characterized by elemental analysis, IR, 1H and 13C NMR measurements as CuL, CuL·pph and CuL.dppm respectively.
1999, 16(6): 98-99
Abstract:
Racemic α-(isopropanyl)-p-chloro(fluoro) phenylacetic acids were resolved with a precipitation method using α-methylbenzylamine as precipitant.The process is easy to handle and less time-consuming.The yields were about 38% with 98% optical purity.
Racemic α-(isopropanyl)-p-chloro(fluoro) phenylacetic acids were resolved with a precipitation method using α-methylbenzylamine as precipitant.The process is easy to handle and less time-consuming.The yields were about 38% with 98% optical purity.
1999, 16(6): 100-101
Abstract:
A new route for the synthesis of the title compound from phthalic anhydride and monoethanolamine is reported.The N-hydroxyethylphthalimide(2) could be reacted directly with HBr without being isolated to give N-bromoethylphylphalimide(3), which reacting with guaiacol by phase transfer catalysis gave O-methoxyphenoxyethyl phthalimide(4).The title compound was then obtained after its hydrolysis.
A new route for the synthesis of the title compound from phthalic anhydride and monoethanolamine is reported.The N-hydroxyethylphthalimide(2) could be reacted directly with HBr without being isolated to give N-bromoethylphylphalimide(3), which reacting with guaiacol by phase transfer catalysis gave O-methoxyphenoxyethyl phthalimide(4).The title compound was then obtained after its hydrolysis.
1999, 16(6): 102-103
Abstract:
The concentration-dependence of the reduced viscosity of dilute polymer solution is interpreted in the light of the self-association concept of polymer chain in solution.The molar selfassociation constant (Ka) is directly proportional to the effective hydrodynamic volume of the polymer chain in solution.In the sense of self-association or cluster formation of polymer chain in solution, there is no difference between branched and linear polymers.
The concentration-dependence of the reduced viscosity of dilute polymer solution is interpreted in the light of the self-association concept of polymer chain in solution.The molar selfassociation constant (Ka) is directly proportional to the effective hydrodynamic volume of the polymer chain in solution.In the sense of self-association or cluster formation of polymer chain in solution, there is no difference between branched and linear polymers.
