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1992 Volume 9 Issue 5
1992, 9(5): 1-5
Abstract:
A new series of monoalkyl t-butylphosphonates (MAtBP) with highly steric hindrance, t-C4H9P(O)(OR)OH, where R represents n-C5H17,-CH2CH(C2H5)C4H9,-CH(CH3)C6H13,-CH2CH2CH(CH3)CH2C(CH3)3 and n-C12H25, respectively, were synthesized and the relationship between their structure and extraction behaviour on Yb(Ⅲ), Lu(Ⅲ)Was investigated. Their extraction ability markedly decreases with the increase of the steric hindrance from ester alkyl group. There is an approximate linear correlation between pH1/2 values and Charton steric parameter v of the ester alkyl groups. The stripping behaviour of Yb, Lu with MAtBP is superior to that with mono-2-ethylhexyl 2-ethylhexylphosphonate (P-507).
A new series of monoalkyl t-butylphosphonates (MAtBP) with highly steric hindrance, t-C4H9P(O)(OR)OH, where R represents n-C5H17,-CH2CH(C2H5)C4H9,-CH(CH3)C6H13,-CH2CH2CH(CH3)CH2C(CH3)3 and n-C12H25, respectively, were synthesized and the relationship between their structure and extraction behaviour on Yb(Ⅲ), Lu(Ⅲ)Was investigated. Their extraction ability markedly decreases with the increase of the steric hindrance from ester alkyl group. There is an approximate linear correlation between pH1/2 values and Charton steric parameter v of the ester alkyl groups. The stripping behaviour of Yb, Lu with MAtBP is superior to that with mono-2-ethylhexyl 2-ethylhexylphosphonate (P-507).
1992, 9(5): 6-10
Abstract:
The adsorption and desorption of cyclohexylamine, as a cross linking agent, on different zeolites were studied by temperature programmed desorption (TPD) technique. It is shown that cyclohexylamine can be strongly adsorbed on the surface of zeolites and the adsorpbilities are dependent on the acid charater of the zeolite's surface. The effective sites of the adsorption are the sites of weak ehemical adsorption. The desorption of cyclohexylamine on the surface of zeolites is related to its diffusion in the crystal of zeolites. The apparent activation energy of the desorption is 63.6, 68.6, 20.1, 46.9 and 47.3 kJ/mol for zeolites 5A, 13X, natural zeolite, NaY, and ZSM-5 respecxively.
The adsorption and desorption of cyclohexylamine, as a cross linking agent, on different zeolites were studied by temperature programmed desorption (TPD) technique. It is shown that cyclohexylamine can be strongly adsorbed on the surface of zeolites and the adsorpbilities are dependent on the acid charater of the zeolite's surface. The effective sites of the adsorption are the sites of weak ehemical adsorption. The desorption of cyclohexylamine on the surface of zeolites is related to its diffusion in the crystal of zeolites. The apparent activation energy of the desorption is 63.6, 68.6, 20.1, 46.9 and 47.3 kJ/mol for zeolites 5A, 13X, natural zeolite, NaY, and ZSM-5 respecxively.
1992, 9(5): 11-15
Abstract:
A copolymer without homopolymer has been prepared form methyl mcthacrylate, butylacrylate, acrylie acid and β-hydroxyethyl metacrylate. The molecular weight and the molecular weight distribution of the copolymer were determined by GPC.The water-solubilized acrylics was obtained by neutralizing 60% of the carboxyl groups of the copolymer, and its rheological behavior, dependence of apparent viscosity on the shear rate as well as on the solid content have been studied. The paint obtained by mixing the water-solubilized acrylics with solidifying agent hexamethoxymethyl melamine (20%) and acidic catalyst PTSA (0.5%) has a well-qualified property.
A copolymer without homopolymer has been prepared form methyl mcthacrylate, butylacrylate, acrylie acid and β-hydroxyethyl metacrylate. The molecular weight and the molecular weight distribution of the copolymer were determined by GPC.The water-solubilized acrylics was obtained by neutralizing 60% of the carboxyl groups of the copolymer, and its rheological behavior, dependence of apparent viscosity on the shear rate as well as on the solid content have been studied. The paint obtained by mixing the water-solubilized acrylics with solidifying agent hexamethoxymethyl melamine (20%) and acidic catalyst PTSA (0.5%) has a well-qualified property.
1992, 9(5): 16-20
Abstract:
A novel trivacant heteropoly comolex α-Na9[GaW9O34H2]xH2O was prepared and characterized by elemental analyses, anion charge determination, IR, UV, polarographic and thermal analyses.Trivacant heteropolyanion[GaW9O34H2]9- can react with some transition metal cations to form trisubstituted heteropolyanions with Keggin structure.
A novel trivacant heteropoly comolex α-Na9[GaW9O34H2]xH2O was prepared and characterized by elemental analyses, anion charge determination, IR, UV, polarographic and thermal analyses.Trivacant heteropolyanion[GaW9O34H2]9- can react with some transition metal cations to form trisubstituted heteropolyanions with Keggin structure.
1992, 9(5): 21-24
Abstract:
The effect of gamma-irradiation on the state of aggregation of nylon 1010 was studied by using WAXD and DSC techniques. The results showed that the crystal damage and amorphotization induced by gamma-irradiation are closely related to the chemical reaction of atoms on the interface between crystalline and non-crystalline region of the polymer. The damaging started from the surface of the crystal and proceeded gradually into the crystal, which became completely amorphous when radiation dose was extremely high.
The effect of gamma-irradiation on the state of aggregation of nylon 1010 was studied by using WAXD and DSC techniques. The results showed that the crystal damage and amorphotization induced by gamma-irradiation are closely related to the chemical reaction of atoms on the interface between crystalline and non-crystalline region of the polymer. The damaging started from the surface of the crystal and proceeded gradually into the crystal, which became completely amorphous when radiation dose was extremely high.
1992, 9(5): 25-28
Abstract:
Fourier transform infrared spectroscopy was used to study solid-solid phase transitions of laurylammonium chloride (LAC) in the temperature range from 290 to 365K. Two structural Phase transitions were observed at 327K and 339K, respectively. In the temperature below 327K, the packing of the hydrocarbon chains is considered to be intercalated with TT conformations. In the temperature between 327 and 339K, the TG defects occured and reached a maximum value at 339K. In this intermediate phase, the nonintercalated packing was found to be coexistent, with the intercalated packing in the intermediate phase. In the temperature above 339K, the packing of the chains is nonintercalated with GT and a few GTG' defects in hexagonal lattice.
Fourier transform infrared spectroscopy was used to study solid-solid phase transitions of laurylammonium chloride (LAC) in the temperature range from 290 to 365K. Two structural Phase transitions were observed at 327K and 339K, respectively. In the temperature below 327K, the packing of the hydrocarbon chains is considered to be intercalated with TT conformations. In the temperature between 327 and 339K, the TG defects occured and reached a maximum value at 339K. In this intermediate phase, the nonintercalated packing was found to be coexistent, with the intercalated packing in the intermediate phase. In the temperature above 339K, the packing of the chains is nonintercalated with GT and a few GTG' defects in hexagonal lattice.
1992, 9(5): 29-33
Abstract:
Pervaporation of dilute aqueous binary mixtures of four organic compounds (acetone A,butanone B,ethanol E and isopropanol P) through silicone rubber (PDMS) and its modifications was investigated. The experimental results showed that an increase in temperature increased the flux exponentially but it had little effect on the selectivity of membrane,Flux and selectivity has the order of A > B > E > P and A > B > P > E respectively.Both properties were increasingly improved when the(CH3)2SiO content in the membrane raised from 70% to 100%.
Pervaporation of dilute aqueous binary mixtures of four organic compounds (acetone A,butanone B,ethanol E and isopropanol P) through silicone rubber (PDMS) and its modifications was investigated. The experimental results showed that an increase in temperature increased the flux exponentially but it had little effect on the selectivity of membrane,Flux and selectivity has the order of A > B > E > P and A > B > P > E respectively.Both properties were increasingly improved when the(CH3)2SiO content in the membrane raised from 70% to 100%.
1992, 9(5): 34-38
Abstract:
The morphology, crystalline state, composition elements and their depth, profile and valence state were studied by scannfing electron microscopy (SEMi), x-ray diffractometry (XRD) and electron spectrometry (XPS and AES). The result showed that the low phosphorous electroless nickel coating has a smooth lamellar structure, composed of Ni and Ni2P of low crystalline state, but they were transformed into Ni and Ni3P of complete crystalline state after heat treatment at 350℃ for 1h.The phosphorous and nickel in low phosphorous eleetroless nickel coating were in zero valance state, with binding energy being 129.1 eV and 852.3 eV respectively. The compositions(A.C.%) of the Ni-P coating were Ni 85.4%, P 10.1%, O 4.5% as obtained after the constant composition region of the AES depth profile curves of the Ni-P coating.
The morphology, crystalline state, composition elements and their depth, profile and valence state were studied by scannfing electron microscopy (SEMi), x-ray diffractometry (XRD) and electron spectrometry (XPS and AES). The result showed that the low phosphorous electroless nickel coating has a smooth lamellar structure, composed of Ni and Ni2P of low crystalline state, but they were transformed into Ni and Ni3P of complete crystalline state after heat treatment at 350℃ for 1h.The phosphorous and nickel in low phosphorous eleetroless nickel coating were in zero valance state, with binding energy being 129.1 eV and 852.3 eV respectively. The compositions(A.C.%) of the Ni-P coating were Ni 85.4%, P 10.1%, O 4.5% as obtained after the constant composition region of the AES depth profile curves of the Ni-P coating.
1992, 9(5): 39-43
Abstract:
The crystal of the title complex, is monoclinic with space group Pc. cell parameters a=0.9361(2),b=1.0519(3),c=1.2028(2)nm,β=91.01(2)°,V=1.1843(4)nm3. Z=4.final R=0.061.Zinc atom is coordinated in a tetrahedron arrangement to four non-esterified oxygen atoms.Two adjacent zinc atoms are connected by "O-P-O" bridge groups, forming an infinite one-dimensional chain coordinated polymer.The infrared spectra indicates formation of the O-P-S groups some important infrared bands have been interpreted.
The crystal of the title complex, is monoclinic with space group Pc. cell parameters a=0.9361(2),b=1.0519(3),c=1.2028(2)nm,β=91.01(2)°,V=1.1843(4)nm3. Z=4.final R=0.061.Zinc atom is coordinated in a tetrahedron arrangement to four non-esterified oxygen atoms.Two adjacent zinc atoms are connected by "O-P-O" bridge groups, forming an infinite one-dimensional chain coordinated polymer.The infrared spectra indicates formation of the O-P-S groups some important infrared bands have been interpreted.
1992, 9(5): 44-49
Abstract:
Some platinum complexes PtA2X2 have been synthesed (A ammonia, isopropylamine; X2H2 aspartic, thiodiglycollic and N-alkyl substituted iminodiaeetic acid). The complexes were characterized by 1H NMR, 13C NMR and IR spectra. The results show that thiodiglycolic acid coordinates to Pt through S, O, O atoms, aspartic acid coordinates to Pt through N, O atoms. For N-alkyl substituted iminodiacetic acid two stable complexes were formed; at pH>5.5 this acid coordinates to Pt through N,O atoms and at pH<4 through N, O, O atoms.The stabilities of the complexes in aqueous solution were also investigated.
Some platinum complexes PtA2X2 have been synthesed (A ammonia, isopropylamine; X2H2 aspartic, thiodiglycollic and N-alkyl substituted iminodiaeetic acid). The complexes were characterized by 1H NMR, 13C NMR and IR spectra. The results show that thiodiglycolic acid coordinates to Pt through S, O, O atoms, aspartic acid coordinates to Pt through N, O atoms. For N-alkyl substituted iminodiacetic acid two stable complexes were formed; at pH>5.5 this acid coordinates to Pt through N,O atoms and at pH<4 through N, O, O atoms.The stabilities of the complexes in aqueous solution were also investigated.
1992, 9(5): 50-55
Abstract:
The magnetisms of both the common nickel catalyst system, Ni(naph)2-Al(i-Bu)3-BF3OEt2-C4H6, and modified nickel catalystlsystems, Ni(naph)2-AI(i-Bu)2(OR)-BF3OEt2-C4H6(-OR is -OPh, -OPhCH3, -OPhC8H18, and -OC8H17), were measured. The order of the reducibility of the coeatalysts in the nickel catalyst systems as follows:Al(i-Bu)3 > Al(i-Bu)2(OPhC8H17) > Al(i)-Bu)2(OPhCH3) > Al(i-Bu)2(OPh) > Al(i-Bu)2(OC8H17).For Ni(naph)2-Al(i-Bu)2(OC8H17)-BF3OEt2 system, Ni(Ⅱ) was mainly reduced to Ni (Ⅰ), during the pdynierization reation while Ni(Ⅰ) and Ni(0) were round in coexistence for other nickel catalyst systems. The aggregation of Ni(0) in Ni(naph)2-Bd-At(i-Bu)2(OPh) and Ni(naph)2-Bd-Al(i-Bu)2(OPhCH3) systems was ferromagnetic, and it was paramagnetic in other systems.
The magnetisms of both the common nickel catalyst system, Ni(naph)2-Al(i-Bu)3-BF3OEt2-C4H6, and modified nickel catalystlsystems, Ni(naph)2-AI(i-Bu)2(OR)-BF3OEt2-C4H6(-OR is -OPh, -OPhCH3, -OPhC8H18, and -OC8H17), were measured. The order of the reducibility of the coeatalysts in the nickel catalyst systems as follows:Al(i-Bu)3 > Al(i-Bu)2(OPhC8H17) > Al(i)-Bu)2(OPhCH3) > Al(i-Bu)2(OPh) > Al(i-Bu)2(OC8H17).For Ni(naph)2-Al(i-Bu)2(OC8H17)-BF3OEt2 system, Ni(Ⅱ) was mainly reduced to Ni (Ⅰ), during the pdynierization reation while Ni(Ⅰ) and Ni(0) were round in coexistence for other nickel catalyst systems. The aggregation of Ni(0) in Ni(naph)2-Bd-At(i-Bu)2(OPh) and Ni(naph)2-Bd-Al(i-Bu)2(OPhCH3) systems was ferromagnetic, and it was paramagnetic in other systems.
1992, 9(5): 56-59
Abstract:
A series of powder phosphors of CaF2:Ce3+ were prepared by solid state reaction. Three luminous centers were found and the fransformation among them has been examined. The effects of different cation charge-compensators on the spectral charactreristies of CaF2:Ce3+ have been investigated also. It showed that different luminous centers resulted from different charge compensating ways.
A series of powder phosphors of CaF2:Ce3+ were prepared by solid state reaction. Three luminous centers were found and the fransformation among them has been examined. The effects of different cation charge-compensators on the spectral charactreristies of CaF2:Ce3+ have been investigated also. It showed that different luminous centers resulted from different charge compensating ways.
1992, 9(5): 60-64
Abstract:
The two Eu(Ⅲ) sites of the Eu(DMBM)(TPPO)2(NO3)2(DMBM:dimethoxybenzoylmethanate;TPPO;triphenyl phosphine oxide) have been probed high-resolution excltation and emission spectra at 77K on the powdered polycrystaline samples. Detailed study of 3D1-7F1(J=0~2) transitions. indicates the two sites with. C2v, and C1,C2 or C symmetry respectively.The' Eu(l) site with C2v predominates in the complex.
The two Eu(Ⅲ) sites of the Eu(DMBM)(TPPO)2(NO3)2(DMBM:dimethoxybenzoylmethanate;TPPO;triphenyl phosphine oxide) have been probed high-resolution excltation and emission spectra at 77K on the powdered polycrystaline samples. Detailed study of 3D1-7F1(J=0~2) transitions. indicates the two sites with. C2v, and C1,C2 or C symmetry respectively.The' Eu(l) site with C2v predominates in the complex.
1992, 9(5): 65-69
Abstract:
The title complex Na4H[Cu(H2TcO6)2]·17H2O has been obtained from alkaline aqueous solution and its crystal struture was determined by four-cycle X-ray diffractometry. The complex is triclinic and has space group P1 with a=0.5930(2)nm, b=0.8957(3)nm, c=0.12555(3)nm, α=98.49(2)°, β=98.98(2), γ=93.94(2)°, V=0.6495(3)nm3, M=913.7, Dc=2.34g/cm3, Z=1. The copper(Ⅲ) ion is chelated by two groups of distorted octahedral TeO4(OH)2 to configurate CuO4 square planar of quasi-D2k symmetry. The distances of Cu-O is 0.1830 and 0.1844 nm respectively.The UV absorption spectrum of the complex solution shows two bands at 270 nm and 405 nm which are attributed to ligand-metal charge transfer transitions.
The title complex Na4H[Cu(H2TcO6)2]·17H2O has been obtained from alkaline aqueous solution and its crystal struture was determined by four-cycle X-ray diffractometry. The complex is triclinic and has space group P1 with a=0.5930(2)nm, b=0.8957(3)nm, c=0.12555(3)nm, α=98.49(2)°, β=98.98(2), γ=93.94(2)°, V=0.6495(3)nm3, M=913.7, Dc=2.34g/cm3, Z=1. The copper(Ⅲ) ion is chelated by two groups of distorted octahedral TeO4(OH)2 to configurate CuO4 square planar of quasi-D2k symmetry. The distances of Cu-O is 0.1830 and 0.1844 nm respectively.The UV absorption spectrum of the complex solution shows two bands at 270 nm and 405 nm which are attributed to ligand-metal charge transfer transitions.
1992, 9(5): 70-73
Abstract:
A series of PET films with different crystallinity (Xc) have been made through annealing at 110℃. The α-peak of short-circuit thermally stimulated current (corresponding to Tg) shifted to the higher temperature region when Xe increased. With the rise of Xc, the activation energy of dipolar thermal relaxation for main chain segmental motion in amorphous phase decreased linearly and the time constant of dipolar thermal relaxation increased exponentially.Crystallization by annealing leads to the increase of the trap depth, but the ability to trap charge carriers showed a maximum when Xe was 22%.
A series of PET films with different crystallinity (Xc) have been made through annealing at 110℃. The α-peak of short-circuit thermally stimulated current (corresponding to Tg) shifted to the higher temperature region when Xe increased. With the rise of Xc, the activation energy of dipolar thermal relaxation for main chain segmental motion in amorphous phase decreased linearly and the time constant of dipolar thermal relaxation increased exponentially.Crystallization by annealing leads to the increase of the trap depth, but the ability to trap charge carriers showed a maximum when Xe was 22%.
1992, 9(5): 74-76
Abstract:
The anion of tungstotantalate was synthesized for the first time as K9TaW11O40·15H2O by the reaction of soluble potassium tantalate and porous white tungstic acid in aqueous solution. The structure of the anion may be proposed reasonably to be similar to that of dodecameric anion of paratungstate, resulting from substituting of one WO group in paratungstate anion by one TaO group and leading to the formation of tungstotantalate anion according to the extreme similarity of IR and UV spectra as well as chemical behavior of these two different anions.Potassium 11-tungstotantalate is soluble in hot water and unstable in alkaline medium while the structure of anion may be considered to keep unchanged in acidic medium according to the spectrophotometrical results.
The anion of tungstotantalate was synthesized for the first time as K9TaW11O40·15H2O by the reaction of soluble potassium tantalate and porous white tungstic acid in aqueous solution. The structure of the anion may be proposed reasonably to be similar to that of dodecameric anion of paratungstate, resulting from substituting of one WO group in paratungstate anion by one TaO group and leading to the formation of tungstotantalate anion according to the extreme similarity of IR and UV spectra as well as chemical behavior of these two different anions.Potassium 11-tungstotantalate is soluble in hot water and unstable in alkaline medium while the structure of anion may be considered to keep unchanged in acidic medium according to the spectrophotometrical results.
1992, 9(5): 77-79
Abstract:
Poly (acrylic acid) (PAA) and its sodium salt of low molecular weight were synthesized by using some redox initiator systems in which (NH4)2S2O8 was a main component. It was found that in acid solutions the resulted polymers were not crosslinked when FeSO4, CuSO4, or Na2S2O3 was present. In neutral solutions the (NH4)2S2O8-FeSO4-NaHSO3 ternary redox system was proved to be preferential for synthesizing low molecular weight PAA and conveniently controlling its molecular weight.
Poly (acrylic acid) (PAA) and its sodium salt of low molecular weight were synthesized by using some redox initiator systems in which (NH4)2S2O8 was a main component. It was found that in acid solutions the resulted polymers were not crosslinked when FeSO4, CuSO4, or Na2S2O3 was present. In neutral solutions the (NH4)2S2O8-FeSO4-NaHSO3 ternary redox system was proved to be preferential for synthesizing low molecular weight PAA and conveniently controlling its molecular weight.
1992, 9(5): 80-83
Abstract:
Vanadium bronze rich in lithium(Li6V5O15)was prepared from Li2CO3 and V2O5 at 680℃. The charge-discharge behaviour of the bronze electrode was investigated in LiAsF6-PC electrolyte at various current densities.Li/bronze cell showed a high specific capacity, and more than 340Ah/kg was obtained at 0.2mA/cm2 and 1.0V cut-off voltage. The X-ray diffraction results showed that the structure of the new bronze was stable for lithium insertion.AC impedance data of Li/bronze cell showed that the cathodic process was mainly controlled by diffusion of Li in the bronze.
Vanadium bronze rich in lithium(Li6V5O15)was prepared from Li2CO3 and V2O5 at 680℃. The charge-discharge behaviour of the bronze electrode was investigated in LiAsF6-PC electrolyte at various current densities.Li/bronze cell showed a high specific capacity, and more than 340Ah/kg was obtained at 0.2mA/cm2 and 1.0V cut-off voltage. The X-ray diffraction results showed that the structure of the new bronze was stable for lithium insertion.AC impedance data of Li/bronze cell showed that the cathodic process was mainly controlled by diffusion of Li in the bronze.
1992, 9(5): 84-86
Abstract:
Some thiourea derivatives were synthesized from corresponding isocyanates and amines:R1NHCSNHR2, where R1=phenyl, α-naphthyl, tertiary butyl; R2=α-phenyl ethyl, substituted benzyl, and substituted phenyl. Some of the compounds in concentration of 100~500 ppm showed a certain effect on the germination of wheat and cucumber.
Some thiourea derivatives were synthesized from corresponding isocyanates and amines:R1NHCSNHR2, where R1=phenyl, α-naphthyl, tertiary butyl; R2=α-phenyl ethyl, substituted benzyl, and substituted phenyl. Some of the compounds in concentration of 100~500 ppm showed a certain effect on the germination of wheat and cucumber.
1992, 9(5): 87-89
Abstract:
It has been introduced in this paper that the network structure of polyacrylamide super water absorbent after absorbing water can be examined under the cryogenic condition by using SEM technique.
It has been introduced in this paper that the network structure of polyacrylamide super water absorbent after absorbing water can be examined under the cryogenic condition by using SEM technique.
1992, 9(5): 90-93
Abstract:
Two biosensors based on banana peel tissue and apple tissue have been developed for oxalate and L-aspartic acid determination respectively. The optimum conditions and the performances of the biosensors have been worked out. The Km and Vm values of oxalate oxidase and L-aspartie decarboxylase were measured by using these biosensors.
Two biosensors based on banana peel tissue and apple tissue have been developed for oxalate and L-aspartic acid determination respectively. The optimum conditions and the performances of the biosensors have been worked out. The Km and Vm values of oxalate oxidase and L-aspartie decarboxylase were measured by using these biosensors.
1992, 9(5): 94-97
Abstract:
The extraction of thallium(Ⅰ) from sulfuric acid medium with some thiophosphates has been studied in various conditions. The relationships between the structure and the property of extractants have been discussed in terms of the calculated results obtained by EHMO method.
The extraction of thallium(Ⅰ) from sulfuric acid medium with some thiophosphates has been studied in various conditions. The relationships between the structure and the property of extractants have been discussed in terms of the calculated results obtained by EHMO method.
1992, 9(5): 98-100
Abstract:
An organolauminium-titanium polymer has been synthesized by the reaction of aluminium ethylacetoacetate diisopropoxide[A] with titanium diethylacetoacetate di(2-hydroxyethoxy) ethoxide[B]. Its structure was characterized by molecular weight determination,IR and 1H NMR. Its solubility in organic solvents and heat-stability were reported.
An organolauminium-titanium polymer has been synthesized by the reaction of aluminium ethylacetoacetate diisopropoxide[A] with titanium diethylacetoacetate di(2-hydroxyethoxy) ethoxide[B]. Its structure was characterized by molecular weight determination,IR and 1H NMR. Its solubility in organic solvents and heat-stability were reported.
1992, 9(5): 101-103
Abstract:
The technological process of textured FTO(SnO2doped with F) film by CVD technique is reported. The optimum conditions for the preparation of textured FTO films of 30×30cm2 with Rsq~10Ω/sq,T~85%, film unevenness<±5% are:Tg=450~50℃, flow rate of ethylene fluoride:0.15~0.30L/min.
The technological process of textured FTO(SnO2doped with F) film by CVD technique is reported. The optimum conditions for the preparation of textured FTO films of 30×30cm2 with Rsq~10Ω/sq,T~85%, film unevenness<±5% are:Tg=450~50℃, flow rate of ethylene fluoride:0.15~0.30L/min.
1992, 9(5): 104-106
Abstract:
The ultrafine LaAlO3 with particle size of 10~50nm was prepared by sol-gel method, The firing temperature was as low as 750℃. The diameter of the ultrafine powder increases gradually with prolonging firing time and increases significantly with increasing firing temperature.
The ultrafine LaAlO3 with particle size of 10~50nm was prepared by sol-gel method, The firing temperature was as low as 750℃. The diameter of the ultrafine powder increases gradually with prolonging firing time and increases significantly with increasing firing temperature.
1992, 9(5): 107-109
Abstract:
Five chiral ternary complexes have been prepared from bidentate ligands contaning N-N coordinating sites and chiral oxy-acids with copper(Ⅱ). Their properties as chiral catalysts in the asymmetric synthesis of chrysanthemic acid have been examined.
Five chiral ternary complexes have been prepared from bidentate ligands contaning N-N coordinating sites and chiral oxy-acids with copper(Ⅱ). Their properties as chiral catalysts in the asymmetric synthesis of chrysanthemic acid have been examined.
1992, 9(5): 110-112
Abstract:
Nicotine and benzene have been determined satisfactorily by derivative UV-spectrop-hotometrie method.The method is accurate, simple and rapid.
Nicotine and benzene have been determined satisfactorily by derivative UV-spectrop-hotometrie method.The method is accurate, simple and rapid.
1992, 9(5): 113-115
Abstract:
The method of coulomctric double-point titration using two polarizing electrodes as indicating electrodes and the formula for calculation and estimation of relative errors are reported.
The method of coulomctric double-point titration using two polarizing electrodes as indicating electrodes and the formula for calculation and estimation of relative errors are reported.
1992, 9(5): 116-119
Abstract:
A series of side-chain liquid crystalline polymers were prepared by polycondensation of the glycidyl ether derivatives of mesomorphic compounds with an aliphatic dicarboxylic acid or anhydride. The polymers were characterized by IR.1H NMR,their liquid crystalline properties were investigatod by DSC and porarized optical microscope.
A series of side-chain liquid crystalline polymers were prepared by polycondensation of the glycidyl ether derivatives of mesomorphic compounds with an aliphatic dicarboxylic acid or anhydride. The polymers were characterized by IR.1H NMR,their liquid crystalline properties were investigatod by DSC and porarized optical microscope.
