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1995 Volume 12 Issue 1
1995, 12(1): 1-4
Abstract:
Conjugated diene solution polymerization catalyzed by polynuclear ND-Al bimetal-lic complex was further studied.Results indicate that the activity of the active species was imporved by appropriate sliaking time.The purity of the polymerization system and the sta-bility of the active species were examined by additional AlEt3.The type of solvent had obvi-ously influence on the activity of the active species and the molecular weight of polymers ob-tained,the order of activity being toluene≥cyclohexane>n-hexane,and conversely,the or-der of[η]being toluene《 cyclohexane<n-hexane.Difference monomers had different fea-tures of stereospecific polymerization;cis-1,4 microstructure content of polybutadiene was lower and varied more obviously with the experimental conditions than that of polyisoprene.The results aid in deepgoing understanding of the stereospecific polymerization initiated by rare earthcatalyst.
Conjugated diene solution polymerization catalyzed by polynuclear ND-Al bimetal-lic complex was further studied.Results indicate that the activity of the active species was imporved by appropriate sliaking time.The purity of the polymerization system and the sta-bility of the active species were examined by additional AlEt3.The type of solvent had obvi-ously influence on the activity of the active species and the molecular weight of polymers ob-tained,the order of activity being toluene≥cyclohexane>n-hexane,and conversely,the or-der of[η]being toluene《 cyclohexane<n-hexane.Difference monomers had different fea-tures of stereospecific polymerization;cis-1,4 microstructure content of polybutadiene was lower and varied more obviously with the experimental conditions than that of polyisoprene.The results aid in deepgoing understanding of the stereospecific polymerization initiated by rare earthcatalyst.
1995, 12(1): 5-8
Abstract:
lmplantation of Li+ ions into hydrogenated amorphous silicon (a-Si:H) film under inducement of electric field has been investigated by photoelectrochemical teehnique and sur-face photovoltaic spectroscopy (SPS).The results show that implantation could take place under less than-0.60V(vs.SCE)in a-Si:Hfilm.The photovoItaic response of the implant-ed film increases by about 60% compared with that of the non-implanted film.
lmplantation of Li+ ions into hydrogenated amorphous silicon (a-Si:H) film under inducement of electric field has been investigated by photoelectrochemical teehnique and sur-face photovoltaic spectroscopy (SPS).The results show that implantation could take place under less than-0.60V(vs.SCE)in a-Si:Hfilm.The photovoItaic response of the implant-ed film increases by about 60% compared with that of the non-implanted film.
1995, 12(1): 9-12
Abstract:
Fifteen ω-azolylalkenes have been synthesized via phase transfer catalyzed Wittig redction from ω-bromoalkenes,which were obtained from 1,4-dibromobutane and triphenyl phosphine.The compounds have been characterized by IR,1H NMR and MS.Some com-pounds were examined on their fungicidal activities.
Fifteen ω-azolylalkenes have been synthesized via phase transfer catalyzed Wittig redction from ω-bromoalkenes,which were obtained from 1,4-dibromobutane and triphenyl phosphine.The compounds have been characterized by IR,1H NMR and MS.Some com-pounds were examined on their fungicidal activities.
1995, 12(1): 13-17
Abstract:
Four complexes of Mn(Ⅲ)with dianion of bis(benzoylacetone)diimine(abbrev.bzacen2-)and organic bases:Mn(bzacen)LClO4,where L is pyrazine,pyridine,γ-methyl pyridIne and acetonitrile, have been synthesized.The crystal structure of [Mn(bzacen)(CH3CN)ClO4]has been determined by X-ray diffraction method.The crystal is orthohom-bic with a=0.9077(1)nm,b=1.5563(1)nm,c=1.7205(2)nm,V=2.4305nm3,Z=4,Dc=1.48g/cm3,Dm=1.49g/cm3;space group Pnma.The compound has an elongated octahedral structure.The electronic spectra and infrared spectra of the compounds have been assigned.
Four complexes of Mn(Ⅲ)with dianion of bis(benzoylacetone)diimine(abbrev.bzacen2-)and organic bases:Mn(bzacen)LClO4,where L is pyrazine,pyridine,γ-methyl pyridIne and acetonitrile, have been synthesized.The crystal structure of [Mn(bzacen)(CH3CN)ClO4]has been determined by X-ray diffraction method.The crystal is orthohom-bic with a=0.9077(1)nm,b=1.5563(1)nm,c=1.7205(2)nm,V=2.4305nm3,Z=4,Dc=1.48g/cm3,Dm=1.49g/cm3;space group Pnma.The compound has an elongated octahedral structure.The electronic spectra and infrared spectra of the compounds have been assigned.
1995, 12(1): 18-20
Abstract:
The Microstructures of polyoxymethylene/polyamide 12 blends(POM/PA12) were analyzed by SEM,FT-IR,DSC and WAXD techniques and mechanical property mea-surement.The results showed the existence of hydrogen bonds in the blends.Addition of PA12 caused the decrease of Tm of POM and increases of the crystallite size L110 and the cell parameters of the blend.Crystallite size L110 between 10.87nm and 14.89nm led to an in-creased thoughness of the blends.
The Microstructures of polyoxymethylene/polyamide 12 blends(POM/PA12) were analyzed by SEM,FT-IR,DSC and WAXD techniques and mechanical property mea-surement.The results showed the existence of hydrogen bonds in the blends.Addition of PA12 caused the decrease of Tm of POM and increases of the crystallite size L110 and the cell parameters of the blend.Crystallite size L110 between 10.87nm and 14.89nm led to an in-creased thoughness of the blends.
1995, 12(1): 21-24
Abstract:
Polypyrrole film doped with indigo carmine was synthesized.This kind of func-tionalized polypyrrole film modified electrode has excellent electrochromic properties,It has shrp color change, short response time and excellent stability.It can be found potential use in fabrication of electrochromic devices.
Polypyrrole film doped with indigo carmine was synthesized.This kind of func-tionalized polypyrrole film modified electrode has excellent electrochromic properties,It has shrp color change, short response time and excellent stability.It can be found potential use in fabrication of electrochromic devices.
1995, 12(1): 25-29
Abstract:
The complexes A-β-M'xHy-[GeW9M3(H2O)3O37·nH2O(M=Cr3+,Mn2+,Co2+,Bu4N+,K+) were prepared stereospecifically.Their IR and UV-vis spec-tra,polarograms and cyclic voltammetric grams, magnetic moment and susceptibility,as well as XPS and ESR spectra were recorded and their catalytic property was studied.
The complexes A-β-M'xHy-[GeW9M3(H2O)3O37·nH2O(M=Cr3+,Mn2+,Co2+,Bu4N+,K+) were prepared stereospecifically.Their IR and UV-vis spec-tra,polarograms and cyclic voltammetric grams, magnetic moment and susceptibility,as well as XPS and ESR spectra were recorded and their catalytic property was studied.
1995, 12(1): 30-33
Abstract:
Four kinds of fluorescent films of regenerated cellulose were prepared by mixing cellulose cuoxam solution and fluorescent powders including Y(PV)O4: Eu, BaMg2Al16O27:Eu,(Zn,Cd)S: Cu and Zn2SiO4:Mn,respectively.The fluorescence spectra, fluores-cence intensity,degree of crystallinity and mechanical property of these films have been stud-ied.The resuIts showed that the peak of crystallinity of fluorescent powder remained un-changed when the film had 5wt%of fluorescent powder of Y(PV)O4: Eu,BaMg2Al16O27:Eu and(Cd,Zn)S:Cu under inradiation of ultraviolet light these films emitted strong red,blue,and yellow light with the fluorescence intensities being 81%,79% and 74%,respec-tively.However, film containing 5%Zn2SiO4: Mn only emitted slightly green light and the structure of crystal of the fluorescent powder in the film was brocken and the degree of crys-tallinity and mechanical preperty of this film increased significantly.
Four kinds of fluorescent films of regenerated cellulose were prepared by mixing cellulose cuoxam solution and fluorescent powders including Y(PV)O4: Eu, BaMg2Al16O27:Eu,(Zn,Cd)S: Cu and Zn2SiO4:Mn,respectively.The fluorescence spectra, fluores-cence intensity,degree of crystallinity and mechanical property of these films have been stud-ied.The resuIts showed that the peak of crystallinity of fluorescent powder remained un-changed when the film had 5wt%of fluorescent powder of Y(PV)O4: Eu,BaMg2Al16O27:Eu and(Cd,Zn)S:Cu under inradiation of ultraviolet light these films emitted strong red,blue,and yellow light with the fluorescence intensities being 81%,79% and 74%,respec-tively.However, film containing 5%Zn2SiO4: Mn only emitted slightly green light and the structure of crystal of the fluorescent powder in the film was brocken and the degree of crys-tallinity and mechanical preperty of this film increased significantly.
1995, 12(1): 34-37
Abstract:
Polystyrene(PS)has been blended with chlorinated polyethylene(CPE)or its graft copolymer(CPE-g-St).The dependence of mechanical properties of the blends on the CPE content,chlorine content in CPE and grafting ratio has been investigated.The resultsshowed that with the CPE(38%Cl)content of 25%, the impact strength of PS/CPE-g-St blend reached 18.5kJ·m-2,(2.1) times to that of PS/CPE blend and higher than that of the commercial HIPS.The tensile strength of PS/CPE-g-St blend was more than 34MPa.Dy-namic mechanical analysis and SEM results showed a better compatibility between CPE and PSt in PS/CPE-g-St blend.
Polystyrene(PS)has been blended with chlorinated polyethylene(CPE)or its graft copolymer(CPE-g-St).The dependence of mechanical properties of the blends on the CPE content,chlorine content in CPE and grafting ratio has been investigated.The resultsshowed that with the CPE(38%Cl)content of 25%, the impact strength of PS/CPE-g-St blend reached 18.5kJ·m-2,(2.1) times to that of PS/CPE blend and higher than that of the commercial HIPS.The tensile strength of PS/CPE-g-St blend was more than 34MPa.Dy-namic mechanical analysis and SEM results showed a better compatibility between CPE and PSt in PS/CPE-g-St blend.
1995, 12(1): 38-42
Abstract:
The alkyl-molybdenum compounds were synthesized via reactions of tricar-bonylpentamethyldisilanyicyclopentadienyl molybdenum anion saIt with alkyl halide(ethyl-chloroacetate,benzyl chloride,ethyliodide,1,4-diiodobutane).The hexamethyltrisiloxyl-bridged-bis(tricarbonylcyclopentadienyl molybdenum anion salt)was treated with glacial acetic acid and followed reacted with ferric sulfate to produce the oxidative coupling molybd-num-molybdenum dinuclear compound.HexamethyItrisiloxyl-bridged bis(tricarbonyl-cyclopentadienyliodo-molybdenum)compound was formed by cleavage of molybdenum-molybdenum bond with iodine.The structures of title compounds were characterized by ele-mental analysis,IR and 1H NMR measurements.
The alkyl-molybdenum compounds were synthesized via reactions of tricar-bonylpentamethyldisilanyicyclopentadienyl molybdenum anion saIt with alkyl halide(ethyl-chloroacetate,benzyl chloride,ethyliodide,1,4-diiodobutane).The hexamethyltrisiloxyl-bridged-bis(tricarbonylcyclopentadienyl molybdenum anion salt)was treated with glacial acetic acid and followed reacted with ferric sulfate to produce the oxidative coupling molybd-num-molybdenum dinuclear compound.HexamethyItrisiloxyl-bridged bis(tricarbonyl-cyclopentadienyliodo-molybdenum)compound was formed by cleavage of molybdenum-molybdenum bond with iodine.The structures of title compounds were characterized by ele-mental analysis,IR and 1H NMR measurements.
1995, 12(1): 43-46
Abstract:
It was found by gas chramatography that nitration of n-dedecylbenzene in mixed acid of HNO3-H2SO4 or HNO3-H3PP4 gave a mixture of mononitrated products containing 60% of p-isomer.It was found by NMR measurement that the mixture of mononitratedproducts from indtistrial dodecylbenzene contained 80% of p-isomer.
It was found by gas chramatography that nitration of n-dedecylbenzene in mixed acid of HNO3-H2SO4 or HNO3-H3PP4 gave a mixture of mononitrated products containing 60% of p-isomer.It was found by NMR measurement that the mixture of mononitratedproducts from indtistrial dodecylbenzene contained 80% of p-isomer.
1995, 12(1): 47-50
Abstract:
The title complexes with n=7~12,16 have been studied by Raman spectroscopy.The assignments of the main bands have been made.The halogens in the anion layer influ-ence indirectly on the internal vibrations of R-NH3+ ions in the cation layer.The C-H stretching, CH2 bending,C-C stretching and NH3 rocking vibrations as well as LAM are sensitive to the effect of halogens.They present obvious differences in frequency value, rela-tive intensity ratio and splitting pattern.The structure of the cation layer closely interrelatesto the structure of anion layer.
The title complexes with n=7~12,16 have been studied by Raman spectroscopy.The assignments of the main bands have been made.The halogens in the anion layer influ-ence indirectly on the internal vibrations of R-NH3+ ions in the cation layer.The C-H stretching, CH2 bending,C-C stretching and NH3 rocking vibrations as well as LAM are sensitive to the effect of halogens.They present obvious differences in frequency value, rela-tive intensity ratio and splitting pattern.The structure of the cation layer closely interrelatesto the structure of anion layer.
1995, 12(1): 51-54
Abstract:
The reactions of dimethoxynaphthelenes with ClSO3SiMe3 were studied in CH2Cl2 at room temperature and examined hy 1H NMR spectroscopy.The influences of the kind and amount of sulfonating agents on the reaction have been examined.The kinetics of formation of 2,4-disubstituted sulfonates has been studied.An anhydride was proved to be formed dur-ing reaction
The reactions of dimethoxynaphthelenes with ClSO3SiMe3 were studied in CH2Cl2 at room temperature and examined hy 1H NMR spectroscopy.The influences of the kind and amount of sulfonating agents on the reaction have been examined.The kinetics of formation of 2,4-disubstituted sulfonates has been studied.An anhydride was proved to be formed dur-ing reaction
1995, 12(1): 55-58
Abstract:
Extraction of catechol and 1,3,5-trihydroxybenzene hy tri-n-octylamine(in ben-zene or octanol)lias been studied.The effects of organic diluents, pH and concentration of Na2SO4 on the distribution coefficient D have been investigated.FTIR analysis of the organic phase shows that trioctylamine forms complexes with phenols through hydrogenbond or ionic association.The compositions of complexes have been determined.
Extraction of catechol and 1,3,5-trihydroxybenzene hy tri-n-octylamine(in ben-zene or octanol)lias been studied.The effects of organic diluents, pH and concentration of Na2SO4 on the distribution coefficient D have been investigated.FTIR analysis of the organic phase shows that trioctylamine forms complexes with phenols through hydrogenbond or ionic association.The compositions of complexes have been determined.
1995, 12(1): 59-62
Abstract:
The molecular mechnics calculation has been performed for conformation analysis of steroids, The results reveal that there are two factors which importantly influence the ac-tivity of the steroids,namely the specific substitution sites(R1 and R2) and the steric posi-tion and energy of oxygen atoms in the compounds.
The molecular mechnics calculation has been performed for conformation analysis of steroids, The results reveal that there are two factors which importantly influence the ac-tivity of the steroids,namely the specific substitution sites(R1 and R2) and the steric posi-tion and energy of oxygen atoms in the compounds.
1995, 12(1): 63-67
Abstract:
Twenty azole compounds containing silicon were synthesized.Their structures were confirmed by IR,MS,1H NMR and elemental analysis.Their fungicidal activities were tested.Several compounds show good activities against Fusarium oxysporum f.sp.vasinfec-tum,etc.Some compounds exhibit good activities against Botrytis cinerea.It is found that the activities were associated with the kind and position of substituent groups as well as with the azole rings.
Twenty azole compounds containing silicon were synthesized.Their structures were confirmed by IR,MS,1H NMR and elemental analysis.Their fungicidal activities were tested.Several compounds show good activities against Fusarium oxysporum f.sp.vasinfec-tum,etc.Some compounds exhibit good activities against Botrytis cinerea.It is found that the activities were associated with the kind and position of substituent groups as well as with the azole rings.
1995, 12(1): 68-72
Abstract:
The polyaniline film electrodes incorporated with platinum microparticles by cyclic potential sweep were prepared and the electrocatalytic activity and stability were studied on oxidation of formaldehyde in 0.5mol/L H2SO4.The electrodes which combine both electroac-tivity and catalytic activity exhibit a very high electrocatalytic activity for oxidation of formaldehyde in aqueous acidic solution.The catalytic currents at the platinum microparticle modified polyaniline electrode were ten times larger than those at naked platinum electrode.The catalytic activity depends strongly on the size,distribution and amount of the loaded platinum microparticles, as well as on the concentration of formaldehyde and the electrode material.
The polyaniline film electrodes incorporated with platinum microparticles by cyclic potential sweep were prepared and the electrocatalytic activity and stability were studied on oxidation of formaldehyde in 0.5mol/L H2SO4.The electrodes which combine both electroac-tivity and catalytic activity exhibit a very high electrocatalytic activity for oxidation of formaldehyde in aqueous acidic solution.The catalytic currents at the platinum microparticle modified polyaniline electrode were ten times larger than those at naked platinum electrode.The catalytic activity depends strongly on the size,distribution and amount of the loaded platinum microparticles, as well as on the concentration of formaldehyde and the electrode material.
1995, 12(1): 73-76
Abstract:
Two novel solid complexes of 4'-bromobenzo-15-crown-5 with potassium thio-cyanate and potassium picrate respectively, having composition of K(BrB15C5)X(X=NCS-or Pic-),have been synthesized and characterized by elemental analysis, infrared spectra,X-ray powder diffraction, molar conductance and solubility measurements.The results re-vealed the formation of 1:1(M:L)type complexes.
Two novel solid complexes of 4'-bromobenzo-15-crown-5 with potassium thio-cyanate and potassium picrate respectively, having composition of K(BrB15C5)X(X=NCS-or Pic-),have been synthesized and characterized by elemental analysis, infrared spectra,X-ray powder diffraction, molar conductance and solubility measurements.The results re-vealed the formation of 1:1(M:L)type complexes.
1995, 12(1): 77-79
Abstract:
The bilayer film consistetl ofα-Fe2O3 and SnO2 was prepared by the sputtering method.The film showed a better sensitivity and selectivity than the individual layer alone.The effects of heat treatment conditions and thickness of the α-Fe2O3 layer on the gas-sensing property of the product have been studied.
The bilayer film consistetl ofα-Fe2O3 and SnO2 was prepared by the sputtering method.The film showed a better sensitivity and selectivity than the individual layer alone.The effects of heat treatment conditions and thickness of the α-Fe2O3 layer on the gas-sensing property of the product have been studied.
1995, 12(1): 80-82
Abstract:
The degree of oxidation,composition and valence tstate of the reduced copper cata-lyst prepared by the reduction in the aqueous phase were examined by themal analysis,pow-der X-ray diffrection analysis and XPS measurements,The catalytic abilities,i.e,hydration activity of acrylonitrile and selectivity of acrylamide and ethylene cyanohydrin were decreased obviously with increase of the degree of oxidation of the reduced catalyst Cu0 was found to be the active component and Cu2+ and Cu+-the poisoning components.The results showed that a variety of active sites exists in the reduced copper catalyst surface and the oxidation of copper catalyst with dissolved oxygen in water was much more rapid thn tht with oxygen in gaseous phase.
The degree of oxidation,composition and valence tstate of the reduced copper cata-lyst prepared by the reduction in the aqueous phase were examined by themal analysis,pow-der X-ray diffrection analysis and XPS measurements,The catalytic abilities,i.e,hydration activity of acrylonitrile and selectivity of acrylamide and ethylene cyanohydrin were decreased obviously with increase of the degree of oxidation of the reduced catalyst Cu0 was found to be the active component and Cu2+ and Cu+-the poisoning components.The results showed that a variety of active sites exists in the reduced copper catalyst surface and the oxidation of copper catalyst with dissolved oxygen in water was much more rapid thn tht with oxygen in gaseous phase.
1995, 12(1): 83-84
Abstract:
The liquidus of ErC13-MgC12-LiC1 ternary system has been investigated by means of DTA.It was found that there are five surfaces correspending to the primary crystallization of ErC13、Li3ErC16、α、α1、α2 respectively,and six univariant lines related to the secondary crys-tallization in the esystem, The eutectic point is at 446℃(65.0% ErC13,18.5% MgC12,16.5% LiC1)and the peritectic point is at 470℃((56.0%ErC13,23.0%MgC12,21.0%LiC1).
The liquidus of ErC13-MgC12-LiC1 ternary system has been investigated by means of DTA.It was found that there are five surfaces correspending to the primary crystallization of ErC13、Li3ErC16、α、α1、α2 respectively,and six univariant lines related to the secondary crys-tallization in the esystem, The eutectic point is at 446℃(65.0% ErC13,18.5% MgC12,16.5% LiC1)and the peritectic point is at 470℃((56.0%ErC13,23.0%MgC12,21.0%LiC1).
1995, 12(1): 85-87
Abstract:
The effect of sodium dodecyl sulfonate(R12SO3Na)on the viscosity of aqueous so-lutions of copolymer of acrylamide and sodium allylsulfonate(ASA)in the presence of NaC1 and/or n-butyl alcohol(R4OH) has been studied.It is shown that the intrinsic viscosity[η] of PASA decreases with the increase of the concentration of R12SO3Na in the presence of both NaC1 and NaC1-R4OH, but increases,when only R4OH is preserit.The effect of R12SO3Naon the viscosity of polyacrylamide(PAM)solution is similar to that of mineral salts, where-as the viscosity of PASA increases with the R12SO3Na.
The effect of sodium dodecyl sulfonate(R12SO3Na)on the viscosity of aqueous so-lutions of copolymer of acrylamide and sodium allylsulfonate(ASA)in the presence of NaC1 and/or n-butyl alcohol(R4OH) has been studied.It is shown that the intrinsic viscosity[η] of PASA decreases with the increase of the concentration of R12SO3Na in the presence of both NaC1 and NaC1-R4OH, but increases,when only R4OH is preserit.The effect of R12SO3Naon the viscosity of polyacrylamide(PAM)solution is similar to that of mineral salts, where-as the viscosity of PASA increases with the R12SO3Na.
1995, 12(1): 88-90
Abstract:
The heat capacity Cp of EDTA solution used as activator in the Buna-S manufac-ture was measured by using a precision automated adiabatic calorimeter in the temperaturer ange of 278K to 324K as fundamental data for the construction of large compositive appara-tus.
The heat capacity Cp of EDTA solution used as activator in the Buna-S manufac-ture was measured by using a precision automated adiabatic calorimeter in the temperaturer ange of 278K to 324K as fundamental data for the construction of large compositive appara-tus.
1995, 12(1): 91-93
Abstract:
The spectra and spectral parameters of calcium aluminophosphate glass doped with Nd3+ions were studied.The absorption, excitation and emission spectra have been measured at room temperature.By using Judd-Ofelt theory the oscillator strengths,Ωλpa-rameter, radiative transition probability, radiative lifetimes and fluorescent branching ratio of Nd3+ ions have been calculated.
The spectra and spectral parameters of calcium aluminophosphate glass doped with Nd3+ions were studied.The absorption, excitation and emission spectra have been measured at room temperature.By using Judd-Ofelt theory the oscillator strengths,Ωλpa-rameter, radiative transition probability, radiative lifetimes and fluorescent branching ratio of Nd3+ ions have been calculated.
1995, 12(1): 94-95
Abstract:
The low sulfur expansible graphite has been prepared using hydrogen peroxide as oxidant and a mixture of oxalic acid and nitric acid as exchnger,The optimum conditions for preparation were:H2O2(30%):graphite=1:10(by weight),25℃, 60min,H2SO4(98%).The expansible graphite with expanding volume of 200mL/g contains only 0.39% sulfur.
The low sulfur expansible graphite has been prepared using hydrogen peroxide as oxidant and a mixture of oxalic acid and nitric acid as exchnger,The optimum conditions for preparation were:H2O2(30%):graphite=1:10(by weight),25℃, 60min,H2SO4(98%).The expansible graphite with expanding volume of 200mL/g contains only 0.39% sulfur.
1995, 12(1): 96-98
Abstract:
The permeability of five polyaryletherketone membranes to H2,CO2,O2,N2 and CH4 has been examined over a temperature range of 30~100℃.The dependence of the per-meability on the temperature and molecular structure of the polymer has been discussed.The PEK-A membrane exhibits both higher permeability and selectivity than PEK-C membrane,and the PEK-H membrane shwed the most gas selectivity among five polymer membranes studied.
The permeability of five polyaryletherketone membranes to H2,CO2,O2,N2 and CH4 has been examined over a temperature range of 30~100℃.The dependence of the per-meability on the temperature and molecular structure of the polymer has been discussed.The PEK-A membrane exhibits both higher permeability and selectivity than PEK-C membrane,and the PEK-H membrane shwed the most gas selectivity among five polymer membranes studied.
1995, 12(1): 99-100
Abstract:
The life time of oil and water films has been measured using the single drop method.A oil phase and surfactant,kerosene,Span-80, and TBP were used.It is found that water films are very unstable and easily breakable.The occurance of re-emulsification and difficuIt occurance of occlusion swelling have been discussed.Amicrodrop technique is proposed to avoid entrainment swelling in liquid surfactant membrane operation.
The life time of oil and water films has been measured using the single drop method.A oil phase and surfactant,kerosene,Span-80, and TBP were used.It is found that water films are very unstable and easily breakable.The occurance of re-emulsification and difficuIt occurance of occlusion swelling have been discussed.Amicrodrop technique is proposed to avoid entrainment swelling in liquid surfactant membrane operation.
1995, 12(1): 101-102
Abstract:
Xylose has been determined on a 2,4-dinitrophenolate electrode based on the reac-tion between 2,4-dinitrophenolate and xylose in NaOH medium.The optimum conditions of determination are described.The method has been applied to determine the xylose content in hydrolysis solution of hemicellulose in waste residtie of papermaking.
Xylose has been determined on a 2,4-dinitrophenolate electrode based on the reac-tion between 2,4-dinitrophenolate and xylose in NaOH medium.The optimum conditions of determination are described.The method has been applied to determine the xylose content in hydrolysis solution of hemicellulose in waste residtie of papermaking.
1995, 12(1): 103-104
Abstract:
S-methyl-isothiourea sulfate was oxidized by aqueous hydrogen peroxide to give methanesulfonyl chloride in 70% yield in aqueous hydrocmoric acid solution.
S-methyl-isothiourea sulfate was oxidized by aqueous hydrogen peroxide to give methanesulfonyl chloride in 70% yield in aqueous hydrocmoric acid solution.
1995, 12(1): 105-107
Abstract:
The thermograms of four kinds of bacteria: Escherichia coli,Shigella flexmeri serotype 6,Shigella flexmeri serotype x,and Shigella flexmeri serotype y in decoction of cop-tis were recorded by microcalorimetric method.The growth rate constants and generation times of the bacteria were calculated.The critical dosage of coptis decoction for restraining the growth of the bacteria have been obtained.
The thermograms of four kinds of bacteria: Escherichia coli,Shigella flexmeri serotype 6,Shigella flexmeri serotype x,and Shigella flexmeri serotype y in decoction of cop-tis were recorded by microcalorimetric method.The growth rate constants and generation times of the bacteria were calculated.The critical dosage of coptis decoction for restraining the growth of the bacteria have been obtained.
1995, 12(1): 108-110
Abstract:
Three types of glucose oxidase(GOD)electrode were fabricatpd by absorbing and/or cross-linking.It was found that the response properties of the enzyme electrode were mainly determined by the methods of membrane formation.In order to obtain an enzyme electrode having fast response time and large current values,a suitable thickness of enzymemembrane is required.
Three types of glucose oxidase(GOD)electrode were fabricatpd by absorbing and/or cross-linking.It was found that the response properties of the enzyme electrode were mainly determined by the methods of membrane formation.In order to obtain an enzyme electrode having fast response time and large current values,a suitable thickness of enzymemembrane is required.
1995, 12(1): 111-113
Abstract:
By using DSC techniques,the melting behvior of nascent polyamide-66 prepared by solid state polycondensation(SSPPA66)and SSPPA66 film casted from formic acid solu-tion has been investjgated.A single melting peak for nascent SSPPA66 and double melting peaks for SSPPA66 film were observed.It appeared that in the SSPPA66 film there are two kinds of crystal with different crystalline structure.
By using DSC techniques,the melting behvior of nascent polyamide-66 prepared by solid state polycondensation(SSPPA66)and SSPPA66 film casted from formic acid solu-tion has been investjgated.A single melting peak for nascent SSPPA66 and double melting peaks for SSPPA66 film were observed.It appeared that in the SSPPA66 film there are two kinds of crystal with different crystalline structure.
1995, 12(1): 114-116
Abstract:
A kind of crease-proof finishing agent for linen textile lias been prepared fromchitin as raw material.The restilts indicated that the recovery angel of resiliance of the tex-tile was increased by 60%~70%,The agent is non-poisonous and harmlessness.The SEMmicrophotographs revealed a better film-forming compattbility between the agent and linentextile.
A kind of crease-proof finishing agent for linen textile lias been prepared fromchitin as raw material.The restilts indicated that the recovery angel of resiliance of the tex-tile was increased by 60%~70%,The agent is non-poisonous and harmlessness.The SEMmicrophotographs revealed a better film-forming compattbility between the agent and linentextile.
1995, 12(1): 117-118
Abstract:
The super water absorbent resin was prepared by copolymerization of sodium acrylate,acrylamide and hydroxyl acrylate,using N,N'-methyl-bis-acrylamide as crosslink-ing agent.The product obtained shws an increased salt resistance.
The super water absorbent resin was prepared by copolymerization of sodium acrylate,acrylamide and hydroxyl acrylate,using N,N'-methyl-bis-acrylamide as crosslink-ing agent.The product obtained shws an increased salt resistance.
