Login In
1998 Volume 15 Issue 2
1998, 15(2): 4-8
Abstract:
The Pt/YSZ(yttria stabilized zirconia) solid electrolyte systems both in three and two electrode configurations have been studied by AC impedance technique at 700~950℃. At open circuit potential, only one semicircular arc in the complex impedance plot was found, correspoding to the electrochemical activation step of the oxygen transfer reaction at the Pt/YSZ. The apparent electrochemical activation energy was measured to be 171.5 kJ/mol and the interface capacitance was found to be about 300 μF/cm2, which is exceptionally large and can not be explained by the classic double layer theory. When the Pt/YSZ system was anodically polarized, the electrochemical resistance was profoundly reduced, but an increase in the electrochemical resistance and the concentration limitation in the impedance diagram were observed when the system was cathodically polarized.
The Pt/YSZ(yttria stabilized zirconia) solid electrolyte systems both in three and two electrode configurations have been studied by AC impedance technique at 700~950℃. At open circuit potential, only one semicircular arc in the complex impedance plot was found, correspoding to the electrochemical activation step of the oxygen transfer reaction at the Pt/YSZ. The apparent electrochemical activation energy was measured to be 171.5 kJ/mol and the interface capacitance was found to be about 300 μF/cm2, which is exceptionally large and can not be explained by the classic double layer theory. When the Pt/YSZ system was anodically polarized, the electrochemical resistance was profoundly reduced, but an increase in the electrochemical resistance and the concentration limitation in the impedance diagram were observed when the system was cathodically polarized.
1998, 15(2): 9-13
Abstract:
The electron transfer occured between the excited fluorane leuco dye and diaryliodonium salt upon UV irradiation resulted in the formation of ring opening colorant and photolysis of iodonium salt, yielding active radical species. Such a system was found to be not only able to initiate the polymerization of epoxy acrylic acid, but also induce the color formation with high color density. Several diaryl iodonium salts with different chain length have been examined. Effects of chain length and counterions in diaryliodonium salts on color formation have been investigated. The colorant formed from fluorane and iodonium salt in photocrosslinked film possessed good thermal and solvent stability.
The electron transfer occured between the excited fluorane leuco dye and diaryliodonium salt upon UV irradiation resulted in the formation of ring opening colorant and photolysis of iodonium salt, yielding active radical species. Such a system was found to be not only able to initiate the polymerization of epoxy acrylic acid, but also induce the color formation with high color density. Several diaryl iodonium salts with different chain length have been examined. Effects of chain length and counterions in diaryliodonium salts on color formation have been investigated. The colorant formed from fluorane and iodonium salt in photocrosslinked film possessed good thermal and solvent stability.
1998, 15(2): 14-17
Abstract:
The hydrotalcite-like compounds CoMAlCO3(HTLc,M=Cu2+, Ni2+,Mn2+,Cr3+,Fe3+) were synthesized by coprecipitation method and characterized by XRD and IR measurements. The results showed that the interlayer H2O and OH- and CO32- in the compounds were lost with the increase of the calcination temperature, with the structure of the compounds being changed into spinel structure. The CO2 TPD results showed that the calcination temperature and Co/Cu ratio of the compounds had an obvious effects on the surface area and the alkalinity of the products.
The hydrotalcite-like compounds CoMAlCO3(HTLc,M=Cu2+, Ni2+,Mn2+,Cr3+,Fe3+) were synthesized by coprecipitation method and characterized by XRD and IR measurements. The results showed that the interlayer H2O and OH- and CO32- in the compounds were lost with the increase of the calcination temperature, with the structure of the compounds being changed into spinel structure. The CO2 TPD results showed that the calcination temperature and Co/Cu ratio of the compounds had an obvious effects on the surface area and the alkalinity of the products.
1998, 15(2): 18-22
Abstract:
The oxidation of p-cresol using CoCuAl hydrotalcite like compounds(HTLc) has been investigated. The calcinated HTLcs were found to have a higher activity than the uncalcinated ones, as well as the simple mixed oxides. The products from calcination at 450℃ with Co:Cu:Al=3:1:1 showed an optimum activity, giving 98.4% yield of p-hydroxy benzaldehyde. A possible mechanism has been proposed, assuming that both Co2+ and Co3+ in the catalysts with spinel structure act as an active center in the reaction.
The oxidation of p-cresol using CoCuAl hydrotalcite like compounds(HTLc) has been investigated. The calcinated HTLcs were found to have a higher activity than the uncalcinated ones, as well as the simple mixed oxides. The products from calcination at 450℃ with Co:Cu:Al=3:1:1 showed an optimum activity, giving 98.4% yield of p-hydroxy benzaldehyde. A possible mechanism has been proposed, assuming that both Co2+ and Co3+ in the catalysts with spinel structure act as an active center in the reaction.
1998, 15(2): 23-26
Abstract:
The title complex TNTBPCo(Ⅱ) was synthesized and characterized by elemental analysis, UV-vis, spectrum, IR photoacoustic spectrum, H NMR and molar conductance measurements. Its electrochemical behavior has been investigated by cyclic voltammetry in DMSO. The half wave potential of [TNTBPCo(Ⅲ)]+ /TNTBPCo(Ⅱ) was -0.255 V and that of TNTBPCo(Ⅱ)/[TNTBPCo(Ⅰ)]-1 was -1.175 V. The half wave potential of redox of porphyrin ring [TNTBPCo(Ⅰ)]-1 /[TNTBPCo(Ⅰ)]-2 was -1.850 V.
The title complex TNTBPCo(Ⅱ) was synthesized and characterized by elemental analysis, UV-vis, spectrum, IR photoacoustic spectrum, H NMR and molar conductance measurements. Its electrochemical behavior has been investigated by cyclic voltammetry in DMSO. The half wave potential of [TNTBPCo(Ⅲ)]+ /TNTBPCo(Ⅱ) was -0.255 V and that of TNTBPCo(Ⅱ)/[TNTBPCo(Ⅰ)]-1 was -1.175 V. The half wave potential of redox of porphyrin ring [TNTBPCo(Ⅰ)]-1 /[TNTBPCo(Ⅰ)]-2 was -1.850 V.
1998, 15(2): 27-30
Abstract:
Poly(2-methoxy-5-dodecyloxy-1,4-phenylenevinylene)(PMDPV) was prepared via dehydrochlorination process, induced by potassium tert-butoxide in tetrahydrofuran. It showed a better solubility and film forming property than poly(2,5-didodecyloxy-1,4-phenylenevinylene). The peak wavelength value of EL cell based on PMDPV was 605 nm. The structure of the polymer was characterized by IR, UV-Vis, 1H NMR, TGA and GPC.
Poly(2-methoxy-5-dodecyloxy-1,4-phenylenevinylene)(PMDPV) was prepared via dehydrochlorination process, induced by potassium tert-butoxide in tetrahydrofuran. It showed a better solubility and film forming property than poly(2,5-didodecyloxy-1,4-phenylenevinylene). The peak wavelength value of EL cell based on PMDPV was 605 nm. The structure of the polymer was characterized by IR, UV-Vis, 1H NMR, TGA and GPC.
1998, 15(2): 31-34
Abstract:
Drug releasing process has been studied by small angle laser scattering. The le-vonorgestrel releasing process was followed with ultraviolet spectrometer. The effects of chain motions and the density fluctuations of the polymer on drug releasing process have been discussed.
Drug releasing process has been studied by small angle laser scattering. The le-vonorgestrel releasing process was followed with ultraviolet spectrometer. The effects of chain motions and the density fluctuations of the polymer on drug releasing process have been discussed.
1998, 15(2): 35-38
Abstract:
Eighteen substituted cyclopentanones containing cyclopentenyl were synthesized. Their chemical structures were confirmed by elemental analysis, IR and 1H NMR measurements. The anticancer activities of the compounds have been examined. Compounds 2l, 2e and 2r were found to be active against KB, HCT, A2780, and A549 tumors in vitro. Compounds 2b and 2d showed activity only against HCT tumor. Compound 2e showed some fungistatic activity against plant pathogens in vitro.
Eighteen substituted cyclopentanones containing cyclopentenyl were synthesized. Their chemical structures were confirmed by elemental analysis, IR and 1H NMR measurements. The anticancer activities of the compounds have been examined. Compounds 2l, 2e and 2r were found to be active against KB, HCT, A2780, and A549 tumors in vitro. Compounds 2b and 2d showed activity only against HCT tumor. Compound 2e showed some fungistatic activity against plant pathogens in vitro.
1998, 15(2): 39-42
Abstract:
Six novel type extractant dialkylphosphoamidate(see Tab. 1) were synthesized. A series of extraction experiments were carried out for separation of acetic acid from dilute solution by the title compounds in the mixture of 1-octanol and kerosene. The mechanism of the extraction has been studied by IR and NMR spectrometry.
Six novel type extractant dialkylphosphoamidate(see Tab. 1) were synthesized. A series of extraction experiments were carried out for separation of acetic acid from dilute solution by the title compounds in the mixture of 1-octanol and kerosene. The mechanism of the extraction has been studied by IR and NMR spectrometry.
1998, 15(2): 43-46
Abstract:
Ultrafine nickel hydroxide was prepared from NiC2O4 ° 2H2O and NaOH in the presence of surfactant and its electrochemical behavior were compared with the micronsized spherical nickel hydroxide by CV and EIS techniques. The ultrafine nickel hydroxide prepared showed a better electrochemical property.
Ultrafine nickel hydroxide was prepared from NiC2O4 ° 2H2O and NaOH in the presence of surfactant and its electrochemical behavior were compared with the micronsized spherical nickel hydroxide by CV and EIS techniques. The ultrafine nickel hydroxide prepared showed a better electrochemical property.
1998, 15(2): 47-50
Abstract:
Cyclic voltammetry and in-situ UV-Visible spectroelectrochemical behavior of (TbPc)Fe(Ⅲ)Cl, (TbPc)Fe(Ⅲ)ClO4 and (TbPc)Zn(Ⅱ) are reported. Five redox steps of Fe(Ⅳ)/radical cation, Fe(Ⅳ)/Fe(Ⅲ), Fe(Ⅲ)/Fe(Ⅱ), Fe(Ⅱ)/Fe(Ⅰ) and Fe(Ⅰ)/radical anion in THF were observed. The existence of un usual oxidation state of Fe(Ⅳ) is attributed to the axial coordination of Cl- anion. A mechanism for the redox reactions has been proposed.
Cyclic voltammetry and in-situ UV-Visible spectroelectrochemical behavior of (TbPc)Fe(Ⅲ)Cl, (TbPc)Fe(Ⅲ)ClO4 and (TbPc)Zn(Ⅱ) are reported. Five redox steps of Fe(Ⅳ)/radical cation, Fe(Ⅳ)/Fe(Ⅲ), Fe(Ⅲ)/Fe(Ⅱ), Fe(Ⅱ)/Fe(Ⅰ) and Fe(Ⅰ)/radical anion in THF were observed. The existence of un usual oxidation state of Fe(Ⅳ) is attributed to the axial coordination of Cl- anion. A mechanism for the redox reactions has been proposed.
1998, 15(2): 51-54
Abstract:
A novel ion exchange resin supported amorphous Ni-B alloy catalyst was prepared. Three kinds of resins were used as supporter:weakly acidic cation exchanger D152, strong acidic cation exchanger D72 and strong basic anion exchanger D261. XPS, TEM and ICP were used to characterize the catalysts. The results showed that the nickel on the catalysts has a strong interaction with the support resins and the interaction varies with the functional group of the resin. Catalyst Ni-B/D261 gave the most oxide peak of Ni 2p3/2 level in XPS spectrum and catalyst Ni-B/D152 the least. The activity experiments of the liquid phase dehydrogenation of 2-propanol confirmed the results.
A novel ion exchange resin supported amorphous Ni-B alloy catalyst was prepared. Three kinds of resins were used as supporter:weakly acidic cation exchanger D152, strong acidic cation exchanger D72 and strong basic anion exchanger D261. XPS, TEM and ICP were used to characterize the catalysts. The results showed that the nickel on the catalysts has a strong interaction with the support resins and the interaction varies with the functional group of the resin. Catalyst Ni-B/D261 gave the most oxide peak of Ni 2p3/2 level in XPS spectrum and catalyst Ni-B/D152 the least. The activity experiments of the liquid phase dehydrogenation of 2-propanol confirmed the results.
1998, 15(2): 55-58
Abstract:
The complexes of meso tetra(4-N-R pyridyl)porphyrin(R=CH3, PhCH2) with Cu(Ⅱ) (CuTMPyP and CuTBPyP) were synthesized by heterogeneous metal insertion reaction. The improved method is advangeous in simplicity and having good yield. Both complexes showed a distinct O2-° scavenging effect and some protective effects on hemoglobin of human erythrocyte in the system of O2-° generating riboflavin on irradiation.
The complexes of meso tetra(4-N-R pyridyl)porphyrin(R=CH3, PhCH2) with Cu(Ⅱ) (CuTMPyP and CuTBPyP) were synthesized by heterogeneous metal insertion reaction. The improved method is advangeous in simplicity and having good yield. Both complexes showed a distinct O2-° scavenging effect and some protective effects on hemoglobin of human erythrocyte in the system of O2-° generating riboflavin on irradiation.
1998, 15(2): 59-62
Abstract:
The effects of As(Ⅴ), Sb(Ⅲ) and Bi(Ⅲ) on the kinetics of the cathodic copper deposition reaction in acidified CuSO4 have been investigated by linear potential sweep method, XPS and XRD. The results indicated that As(Ⅴ) ions increased the density of exchange current of copper deposition reaction and had done an action of unpolarization on the process of copper deposition. Sb(Ⅲ) and Bi(Ⅲ) ions, on the contrary, decreased the density of exchange current and had an action of polarization on the process of copper deposition. As, Sb and Bi ions showed no influence on the reaction mechanism of copper deposition. They did not deposite on the cathode when electrolysis was at 200 A/m2, they also did not effect on the copper deposition predominant crystal orientation(220). As and Bi co deposited on the cathode with Cu when electrolysis was at 1500 A/m2, with copper deposition predominant crystal orientation being changed into (111). Copper deposited in the form of metal Cu and few in Cu2O. Bismuth was in the form of Bi2O3.
The effects of As(Ⅴ), Sb(Ⅲ) and Bi(Ⅲ) on the kinetics of the cathodic copper deposition reaction in acidified CuSO4 have been investigated by linear potential sweep method, XPS and XRD. The results indicated that As(Ⅴ) ions increased the density of exchange current of copper deposition reaction and had done an action of unpolarization on the process of copper deposition. Sb(Ⅲ) and Bi(Ⅲ) ions, on the contrary, decreased the density of exchange current and had an action of polarization on the process of copper deposition. As, Sb and Bi ions showed no influence on the reaction mechanism of copper deposition. They did not deposite on the cathode when electrolysis was at 200 A/m2, they also did not effect on the copper deposition predominant crystal orientation(220). As and Bi co deposited on the cathode with Cu when electrolysis was at 1500 A/m2, with copper deposition predominant crystal orientation being changed into (111). Copper deposited in the form of metal Cu and few in Cu2O. Bismuth was in the form of Bi2O3.
1998, 15(2): 63-66
Abstract:
Sb-doped CdSnO3 solid solution powder was prepared by chemical coprecipitation in accordance with the formula CdSbxSn1-xO3. XRD results indicated the 0< x<0.3. The electric resistance of the samples markedly decreased at first and then increased gradually with the doped Sb content. Samples with x=0.02 and 0.25 showed the lowest value of resistance. The mechanisms of solid solubility and conductivity of the system have been discussed.
Sb-doped CdSnO3 solid solution powder was prepared by chemical coprecipitation in accordance with the formula CdSbxSn1-xO3. XRD results indicated the 0< x<0.3. The electric resistance of the samples markedly decreased at first and then increased gradually with the doped Sb content. Samples with x=0.02 and 0.25 showed the lowest value of resistance. The mechanisms of solid solubility and conductivity of the system have been discussed.
1998, 15(2): 67-70
Abstract:
The chemical manganese dioxide(CMD) for alkaline zinc manganese battery was prepared through direct oxidation or V-MnO2 by chlorine gas in sulfuric acid medium at 85-90 ℃ with addition of MgO as pH regulator, followed by protonation with KMnO4 solution. The CMD obtained was an n-type semiconductor and showed an improved electrochemical property. The sample battery LR03 showed a good discharge behavior.
The chemical manganese dioxide(CMD) for alkaline zinc manganese battery was prepared through direct oxidation or V-MnO2 by chlorine gas in sulfuric acid medium at 85-90 ℃ with addition of MgO as pH regulator, followed by protonation with KMnO4 solution. The CMD obtained was an n-type semiconductor and showed an improved electrochemical property. The sample battery LR03 showed a good discharge behavior.
1998, 15(2): 71-74
Abstract:
The graphite-AS(acrylonitrile styrene copolymer) composite electrodes were prepared and characterized by IR and cyclic voltammetry. The electrodes were applied in determination of trace amount of Ag+ in waste water and showed a higher stability, reproductivity and selectivity. Owing to the presence of the abundant polar groups from AS, the electrodes showed an advantages of being further modification with NH2OH ° HCl, giving an additional property.
The graphite-AS(acrylonitrile styrene copolymer) composite electrodes were prepared and characterized by IR and cyclic voltammetry. The electrodes were applied in determination of trace amount of Ag+ in waste water and showed a higher stability, reproductivity and selectivity. Owing to the presence of the abundant polar groups from AS, the electrodes showed an advantages of being further modification with NH2OH ° HCl, giving an additional property.
1998, 15(2): 75-78
Abstract:
Twelve aryl ethanoneoxime derivatives containing 1H-1,2,4-triazole group were synthesized and characterized by 1H NMR, MS spectra and elemental analysis. Preliminary bioassays showed that the compounds exhibited some fungicid activity and plant growth regulating activity.
Twelve aryl ethanoneoxime derivatives containing 1H-1,2,4-triazole group were synthesized and characterized by 1H NMR, MS spectra and elemental analysis. Preliminary bioassays showed that the compounds exhibited some fungicid activity and plant growth regulating activity.
1998, 15(2): 79-81
Abstract:
Ten tribenzyltin dithiocarbamates (PhCH2)3SnS2CR (R:(CH2)5N-, (CH3)2N-, (C2H5)2N-, (n C4H9)2N-, (HOCH2CH2)2N-, (C6H5)(COCH3)N-, (C6H5)CH3N-, (C6H5)2N-, C4H4N-, (CH2)2(CO)2N-) were synthesized by reacting tribenzyltin chloride with potassium salts of dithiocarbamic acid. All the compounds were characterized by elemental analysis, IR and 1H NMR spectra.
Ten tribenzyltin dithiocarbamates (PhCH2)3SnS2CR (R:(CH2)5N-, (CH3)2N-, (C2H5)2N-, (n C4H9)2N-, (HOCH2CH2)2N-, (C6H5)(COCH3)N-, (C6H5)CH3N-, (C6H5)2N-, C4H4N-, (CH2)2(CO)2N-) were synthesized by reacting tribenzyltin chloride with potassium salts of dithiocarbamic acid. All the compounds were characterized by elemental analysis, IR and 1H NMR spectra.
1998, 15(2): 82-84
Abstract:
(2S,3R)-Sitophilate, the major component of the aggregation pheromone of the granary weevil (Sitophilus granarius) was stereoselectively synthesized by a four-step sequence, using N-bornane-2,10-sultam as a chiral auxiliary. The key step was the asymmetric syn-aldolization of N-bropionyl bornane-2,10-sultam with propylaldehyde. The enantiometric excess of (2S,3R)-sitophilate was about 95% ee.
(2S,3R)-Sitophilate, the major component of the aggregation pheromone of the granary weevil (Sitophilus granarius) was stereoselectively synthesized by a four-step sequence, using N-bornane-2,10-sultam as a chiral auxiliary. The key step was the asymmetric syn-aldolization of N-bropionyl bornane-2,10-sultam with propylaldehyde. The enantiometric excess of (2S,3R)-sitophilate was about 95% ee.
1998, 15(2): 85-87
Abstract:
The soap-free hydrosol, which was crosslinked by Zn(NH3)42+ to form coating film, has been prepared from acrylate copolymer from (methyl metacrylate/butyl acrylate/acrylic acid/styrene (or divinylbenzene). The coating films have better water resistance due to the presence of benzene ring in the copolymer, which has been characterized by 13C NMR, IR and GPC for molecular weight determination.
The soap-free hydrosol, which was crosslinked by Zn(NH3)42+ to form coating film, has been prepared from acrylate copolymer from (methyl metacrylate/butyl acrylate/acrylic acid/styrene (or divinylbenzene). The coating films have better water resistance due to the presence of benzene ring in the copolymer, which has been characterized by 13C NMR, IR and GPC for molecular weight determination.
1998, 15(2): 88-90
Abstract:
The rheological behavior, heat resistance, lustre and hardness of the acrylate copolymer soap-free coating with Zn(NH3)42+4 as crosslinking agent have been studied. The water-borne coating shows satisfactory properties.
The rheological behavior, heat resistance, lustre and hardness of the acrylate copolymer soap-free coating with Zn(NH3)42+4 as crosslinking agent have been studied. The water-borne coating shows satisfactory properties.
1998, 15(2): 91-93
Abstract:
The static state contact angle technique has been used in study the properties of the CF4/CH4 plasma modified PET surface. The surface free energy, polar component and dispersion component before and after plasma treatment and water impregnation were calculated by Keable method. The hydrophobic property of the modified PET surface was improved and the CF4/CH4 plasma exhibited a stronger effect than the CF4 plasma.
The static state contact angle technique has been used in study the properties of the CF4/CH4 plasma modified PET surface. The surface free energy, polar component and dispersion component before and after plasma treatment and water impregnation were calculated by Keable method. The hydrophobic property of the modified PET surface was improved and the CF4/CH4 plasma exhibited a stronger effect than the CF4 plasma.
1998, 15(2): 94-96
Abstract:
The stability constants (logKPbLAPb) of the mixed ligand complexes, PbLA[L=2,2'-bipyridyl(bipy)、1,10-phenanthroline(phen)、5-nitro-1,10-phenanthroline(Nphe), A=malonic acid(mal2-)、benzyl malonic acid(pmal2-)、phenylethylmalonic acid radicals(pmal2-)] have been determined at 25 ℃ in 10% ethanol with ionic strength I=0.1(KNO3) mol/L by potentrometric titration. It is found that the △logK、logX values of the mixed ligand complexes are obviously higher than the △logK(s)、logX(s). The stability caused by the complexes has been discussed.
The stability constants (logKPbLAPb) of the mixed ligand complexes, PbLA[L=2,2'-bipyridyl(bipy)、1,10-phenanthroline(phen)、5-nitro-1,10-phenanthroline(Nphe), A=malonic acid(mal2-)、benzyl malonic acid(pmal2-)、phenylethylmalonic acid radicals(pmal2-)] have been determined at 25 ℃ in 10% ethanol with ionic strength I=0.1(KNO3) mol/L by potentrometric titration. It is found that the △logK、logX values of the mixed ligand complexes are obviously higher than the △logK(s)、logX(s). The stability caused by the complexes has been discussed.
1998, 15(2): 97-99
Abstract:
The indirect electrolytic oxidative coupling reaction of some activated methylene compounds was studied by using KI-NaI as the indirect electrolyte and acetone as solvent. The results showed that this oxidative system was suitable for U-dicarbonyl compounds having acidity of pK=9~13 under proper conditions to give symmetric multifunctional products in satisfactory yields.
The indirect electrolytic oxidative coupling reaction of some activated methylene compounds was studied by using KI-NaI as the indirect electrolyte and acetone as solvent. The results showed that this oxidative system was suitable for U-dicarbonyl compounds having acidity of pK=9~13 under proper conditions to give symmetric multifunctional products in satisfactory yields.
1998, 15(2): 100-102
Abstract:
The equilibrium constants and oxygenation constants of ethylenediamine-Co complex (en-Co(Ⅱ)) were determined by potentiometry method. The oxygenation species and their formation conditions have been investigated as well. Two oxygenation species:(Coen3)2O2 and (Coen2)O2(Coen3) found in potentiometry were verified by spectrophotometry and oxygen electrode titration.
The equilibrium constants and oxygenation constants of ethylenediamine-Co complex (en-Co(Ⅱ)) were determined by potentiometry method. The oxygenation species and their formation conditions have been investigated as well. Two oxygenation species:(Coen3)2O2 and (Coen2)O2(Coen3) found in potentiometry were verified by spectrophotometry and oxygen electrode titration.
1998, 15(2): 103-105
Abstract:
A novel ion-type photosensitive polyimide(PSPI) with thiophen acrylic acid as photosensitizer was prepared. It has a sensitivity of 2500 J/m2 and resolution of 1~2 μm under irradiation with Hg lamp of 365 nm wavelength. The catalytic influence of tertiary amine on the imidization of poly(amic acid) during PSPI preparation has been discussed as well.
A novel ion-type photosensitive polyimide(PSPI) with thiophen acrylic acid as photosensitizer was prepared. It has a sensitivity of 2500 J/m2 and resolution of 1~2 μm under irradiation with Hg lamp of 365 nm wavelength. The catalytic influence of tertiary amine on the imidization of poly(amic acid) during PSPI preparation has been discussed as well.
1998, 15(2): 106-108
Abstract:
Using toluene solution of linear polystyrene as porofor, the macroporous microbeads of poly(styrene-co-divinylbenzene) were prepared by suspension polymerization. Their pore volume and pore size distributions were measured by mercury porosimetry and bead textures were observed by scanning electron microscope. The influences of porofor composition, porofor amount and DVB content upon pore volume and pore size distribution have been investigated. The presence of the residual double bonds in the microbeads was confirmed by FT Infred-red spectra. It is concluded that about 40% of the secondary double bonds were remained active after polymerization.
Using toluene solution of linear polystyrene as porofor, the macroporous microbeads of poly(styrene-co-divinylbenzene) were prepared by suspension polymerization. Their pore volume and pore size distributions were measured by mercury porosimetry and bead textures were observed by scanning electron microscope. The influences of porofor composition, porofor amount and DVB content upon pore volume and pore size distribution have been investigated. The presence of the residual double bonds in the microbeads was confirmed by FT Infred-red spectra. It is concluded that about 40% of the secondary double bonds were remained active after polymerization.
1998, 15(2): 109-111
Abstract:
Two indolinospirobenzopyrans bearing monoaza benzo-15-C-5 at the 1' position were prepared, and their structures were determined by IR, 1H NMR and MS measurements. Their photochromic and cation induced photochromic properties have been investigated.
Two indolinospirobenzopyrans bearing monoaza benzo-15-C-5 at the 1' position were prepared, and their structures were determined by IR, 1H NMR and MS measurements. Their photochromic and cation induced photochromic properties have been investigated.
1998, 15(2): 112-114
Abstract:
Diastereomers of 2-oxo-2 substituted phenoxy-4-phenyl-5,5-dimethyl-1,3,2-dioxaphosphorin were synthesized. The synthetic methods, solvents and salts appeared to exhibit significant influences on the cis/trans ratio of the products. The isomerization between cis and trans cyclic phosphates was investigated. The preliminary bioassay indicated that some isomers have herbicidal and plant growth activity.
Diastereomers of 2-oxo-2 substituted phenoxy-4-phenyl-5,5-dimethyl-1,3,2-dioxaphosphorin were synthesized. The synthetic methods, solvents and salts appeared to exhibit significant influences on the cis/trans ratio of the products. The isomerization between cis and trans cyclic phosphates was investigated. The preliminary bioassay indicated that some isomers have herbicidal and plant growth activity.
1998, 15(2): 115-117
Abstract:
The optimum technology conditions of preparation of the high density spherical Ni(OH)2 particles used as active material are reported. The size of the porous particles and crystal grain can be controlled by adjusting the micro crystal growth in order to get a tap density in 1.6 to 2.6 g/mL. Addition of a proper dopant could make the utilization ratio of Ni(OH)2 close to 100% in the pasted nickel positive electrode.
The optimum technology conditions of preparation of the high density spherical Ni(OH)2 particles used as active material are reported. The size of the porous particles and crystal grain can be controlled by adjusting the micro crystal growth in order to get a tap density in 1.6 to 2.6 g/mL. Addition of a proper dopant could make the utilization ratio of Ni(OH)2 close to 100% in the pasted nickel positive electrode.
1998, 15(2): 118-119
Abstract:
A series of sintered complex oxides were prepared from T-Fe2O3 and K2CO3 (in molar ratio of 95:5) with addition of TiO2. The XRD results showed that addition of TiO2 increased the porosity of the mixed oxides and eliminated the formation of U-K2O and KFe11O17 phases, which usually cause the hysteresis of such a material.
A series of sintered complex oxides were prepared from T-Fe2O3 and K2CO3 (in molar ratio of 95:5) with addition of TiO2. The XRD results showed that addition of TiO2 increased the porosity of the mixed oxides and eliminated the formation of U-K2O and KFe11O17 phases, which usually cause the hysteresis of such a material.
1998, 15(2): 120-121
Abstract:
Some heteropoly acids were used as catalyst for epoxidation of soybean oil and corn oil by hydrogen peroxide and formic acid. Among them the CPW, i.e. [(C5H5)N-(CH2)15CH3]3PW12O40 was found to be the most active one. The epoxidized soybean oil and corn oil have epoxy value of 6.6% and 6.4%, respectively, with iodine value less than 6 g(I2)/100 g.
Some heteropoly acids were used as catalyst for epoxidation of soybean oil and corn oil by hydrogen peroxide and formic acid. Among them the CPW, i.e. [(C5H5)N-(CH2)15CH3]3PW12O40 was found to be the most active one. The epoxidized soybean oil and corn oil have epoxy value of 6.6% and 6.4%, respectively, with iodine value less than 6 g(I2)/100 g.
