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1990 Volume 7 Issue 6
1990, 7(6): 1-8
Abstract:
Recent advances of polyaniline in electronic phenomena, conducting mechanism, properties and applications are reviewed.
Recent advances of polyaniline in electronic phenomena, conducting mechanism, properties and applications are reviewed.
1990, 7(6): 9-13
Abstract:
It is found by accelerating tarnish test of cysteine solution that ethylenediamine tetra-methylene phosphoric acid (EDTMP) was an excellent antitarnishing agent for tinplate. The antitarnish mechanism of EDTMP for tinplate has been studied by XPS, AES and laser Raman spectromety. A complicated anticorrosion film was formed on tin surface. The rela-tive atomic percent contents (A. C.%) or the film obtained from the constant element como-sition region of the profile curves were O 48.0%,Sn 10.7%, N7.7%,C 23.1% and P10.5.
It is found by accelerating tarnish test of cysteine solution that ethylenediamine tetra-methylene phosphoric acid (EDTMP) was an excellent antitarnishing agent for tinplate. The antitarnish mechanism of EDTMP for tinplate has been studied by XPS, AES and laser Raman spectromety. A complicated anticorrosion film was formed on tin surface. The rela-tive atomic percent contents (A. C.%) or the film obtained from the constant element como-sition region of the profile curves were O 48.0%,Sn 10.7%, N7.7%,C 23.1% and P10.5.
1990, 7(6): 14-18
Abstract:
A new kind of polymeric electrolyte film with low glass transition temperature and high room temperature conductivity was prepared by plasticizing the complex of poly (ethy-lene oxide-propylene oxide-allyl glycidyl ether) and LiClO4 with dimethoxy poly (ethylen eglycol) (PEGDME). The effect of plasticizer content on the conductivity of electrolyte was studied. The plasticized electrolyte films showed both a good thermal stability and a good mechanical property. A room temperature conductivity as high as 2×10-4Scm-1 was obtained for film with 60%(vol) plasticizer. The mclecular weight of the plasticizer as a function of conductity was discussed as well.
A new kind of polymeric electrolyte film with low glass transition temperature and high room temperature conductivity was prepared by plasticizing the complex of poly (ethy-lene oxide-propylene oxide-allyl glycidyl ether) and LiClO4 with dimethoxy poly (ethylen eglycol) (PEGDME). The effect of plasticizer content on the conductivity of electrolyte was studied. The plasticized electrolyte films showed both a good thermal stability and a good mechanical property. A room temperature conductivity as high as 2×10-4Scm-1 was obtained for film with 60%(vol) plasticizer. The mclecular weight of the plasticizer as a function of conductity was discussed as well.
1990, 7(6): 19-22
Abstract:
An iron-catalyst system FeCl3-Phen-Al(i-Bu)3 for butadiene polymerization has been studied. The results of magnetic susceptibility and UV-Vis spectra measurements indicated that a high-spin complex FeCl3·(EA)2 was formed from FeCl3 and ethyl acetate(EA). The presence of o-phenanthroline(Phen) stabilizes Fe(Ⅱ),markedly reducing the ferromagnetism of the catalyst system.
An iron-catalyst system FeCl3-Phen-Al(i-Bu)3 for butadiene polymerization has been studied. The results of magnetic susceptibility and UV-Vis spectra measurements indicated that a high-spin complex FeCl3·(EA)2 was formed from FeCl3 and ethyl acetate(EA). The presence of o-phenanthroline(Phen) stabilizes Fe(Ⅱ),markedly reducing the ferromagnetism of the catalyst system.
1990, 7(6): 23-27
Abstract:
AlCl3 which was activated by heating with aluminum powder reacts with RECl3 in benzene solution giving two new neutral arene complexes, RE(C6H6) (AlCl4)3C6H6 (RE=La, Nd).The complexes were characterized by elemental analysis and IR spectra measurement. The molecular structure of necdium containing complex has been determined. It's isomor-phous and isostructural with Sm(C6H6) (AlCl4)3C6H6. The Nd-C and Nd-Cl bond lengths are respectively longer than Sm-C and Sm-Cl bond lengths in corresponding Sm-containingcomplex.
AlCl3 which was activated by heating with aluminum powder reacts with RECl3 in benzene solution giving two new neutral arene complexes, RE(C6H6) (AlCl4)3C6H6 (RE=La, Nd).The complexes were characterized by elemental analysis and IR spectra measurement. The molecular structure of necdium containing complex has been determined. It's isomor-phous and isostructural with Sm(C6H6) (AlCl4)3C6H6. The Nd-C and Nd-Cl bond lengths are respectively longer than Sm-C and Sm-Cl bond lengths in corresponding Sm-containingcomplex.
1990, 7(6): 28-32
Abstract:
The aqueous acrylate emulsion paints for wooden furniture capable of chelate-crosslink-ing under room temperature were obtained. The effect of emulsifiers, their compounding,co-polymerization temperature on the yield of the copolymer and the properties of emulsion system have been studied.
The aqueous acrylate emulsion paints for wooden furniture capable of chelate-crosslink-ing under room temperature were obtained. The effect of emulsifiers, their compounding,co-polymerization temperature on the yield of the copolymer and the properties of emulsion system have been studied.
1990, 7(6): 33-36
Abstract:
The application of the PLS method to simultaneous spectrophotometric determination of copper, zinc and manganese in 5-Br-PADAP-OP system has been investigated. The method gave satisfatory results for the determination of these elements in composite samples and in Al-alloy sample without previous separation. The relative errors are 1.3~9.7%.
The application of the PLS method to simultaneous spectrophotometric determination of copper, zinc and manganese in 5-Br-PADAP-OP system has been investigated. The method gave satisfatory results for the determination of these elements in composite samples and in Al-alloy sample without previous separation. The relative errors are 1.3~9.7%.
1990, 7(6): 37-42
Abstract:
in φ-lgi relations steady-state were determined for the O2 evolution on Pt electrode in HClO4 and H2SO4 solutions of concentrations from 0.05-40mol·kg-1. There are three re-gions on the φ-lgi curves. The first is the lower overpotential region with ðφ/ðlgi=2.303 RT/βF (β=0.5), followed by the second potential jump region, and then the third region again with a Tafel slope of approximately to 2.303θRT/βF. The reaction order of O2 evolu-tion with respect to aw was found to be 1 in the first and second regions, while in thethird region the reaction order of O2 evolution with respect to aw·aClO4- or aw·aHSO4- was found to be 1/2. Possible mechanisms for oxygen evolution were proposed. Some of them explain quite satisfactorily the difference in Tafel slope in different region of polarization curves and the various order of reaction with respect to different reactants.
in φ-lgi relations steady-state were determined for the O2 evolution on Pt electrode in HClO4 and H2SO4 solutions of concentrations from 0.05-40mol·kg-1. There are three re-gions on the φ-lgi curves. The first is the lower overpotential region with ðφ/ðlgi=2.303 RT/βF (β=0.5), followed by the second potential jump region, and then the third region again with a Tafel slope of approximately to 2.303θRT/βF. The reaction order of O2 evolu-tion with respect to aw was found to be 1 in the first and second regions, while in thethird region the reaction order of O2 evolution with respect to aw·aClO4- or aw·aHSO4- was found to be 1/2. Possible mechanisms for oxygen evolution were proposed. Some of them explain quite satisfactorily the difference in Tafel slope in different region of polarization curves and the various order of reaction with respect to different reactants.
1990, 7(6): 43-47
Abstract:
The effects of silver on the chalcopyrite leaching have been studied. No catalytic effect was found when FeCl3 and CuCl2 were used as oxidizing agent. In the case of Fe2(SO4)3 and MnO2 the reaction rate constants were found to be increased 200 times as compared with that without silver additives. In the acidic Fe2(SO3)2 leaching of chalcopyrite the reaction rate is controlled by ion diffussion through the elemental sulfur layer. The apparent activation energy is 35.7 kJ/mol. The order of reaction is 1.5 with respect to silver ion concentration and first order with respect to ferric ion concentration. The rate Constant of the diffusion controlled reaction is inversely propotional to the square root of the initial radius of chalcopyrite particles. The overall reaction kinetics equation has been derived.
The effects of silver on the chalcopyrite leaching have been studied. No catalytic effect was found when FeCl3 and CuCl2 were used as oxidizing agent. In the case of Fe2(SO4)3 and MnO2 the reaction rate constants were found to be increased 200 times as compared with that without silver additives. In the acidic Fe2(SO3)2 leaching of chalcopyrite the reaction rate is controlled by ion diffussion through the elemental sulfur layer. The apparent activation energy is 35.7 kJ/mol. The order of reaction is 1.5 with respect to silver ion concentration and first order with respect to ferric ion concentration. The rate Constant of the diffusion controlled reaction is inversely propotional to the square root of the initial radius of chalcopyrite particles. The overall reaction kinetics equation has been derived.
1990, 7(6): 48-53
Abstract:
In this paper, the effects of the extension influence of SEC column on the variables for a polymer with long chain branching were studied and the main coupled equations were drawn out and solved. The solving process is confirmed by computer simulation. The effects of the extension influence,correction parameter and experimental error on the results of determination have been discussed and a method for systematic characterization of the molecular weight distribution of irradiated polymers by SEC-LALLS technology was sug-gested.
In this paper, the effects of the extension influence of SEC column on the variables for a polymer with long chain branching were studied and the main coupled equations were drawn out and solved. The solving process is confirmed by computer simulation. The effects of the extension influence,correction parameter and experimental error on the results of determination have been discussed and a method for systematic characterization of the molecular weight distribution of irradiated polymers by SEC-LALLS technology was sug-gested.
1990, 7(6): 54-57
Abstract:
Amide derivatives containing pyrimidine group have been synthesized with general formula
where R1=H, CH3; R2=CH3, C6H5, CH3C6H5, CH3OC6H4, ClC6H4, FC6H4 The structures of the compounds were confirmed by IR,1H-NMR and elemental analy-sis. Some of the compounds are effective against Musca domestica and fungi.
Amide derivatives containing pyrimidine group have been synthesized with general formula
where R1=H, CH3; R2=CH3, C6H5, CH3C6H5, CH3OC6H4, ClC6H4, FC6H4 The structures of the compounds were confirmed by IR,1H-NMR and elemental analy-sis. Some of the compounds are effective against Musca domestica and fungi.
1990, 7(6): 58-60
Abstract:
The equilibrium constants and coordination numbers for axial reaction of cobalt(Ⅱ) tetrakis (4-trimethylamino phenyl)-porphyrin iodide hydrate (abb. Co(Ⅱ) TMAPPI) with nitrogen containing organic bases were measured by spectral technique. The results show that Co(Ⅱ)TMAPPI forms 1:2 adducts with imidazoline (Im) and benzimidazoline (PhIm),but 1:1 adducts with pyridine(Py) and n-propylaniline (P1NH2). The mechanism of the auxi-liary catalytic effect of nitrogen containing organic bases on the electrocatalytic reduction of CO2 with Co(Ⅱ)TMAPPI was discussed.
The equilibrium constants and coordination numbers for axial reaction of cobalt(Ⅱ) tetrakis (4-trimethylamino phenyl)-porphyrin iodide hydrate (abb. Co(Ⅱ) TMAPPI) with nitrogen containing organic bases were measured by spectral technique. The results show that Co(Ⅱ)TMAPPI forms 1:2 adducts with imidazoline (Im) and benzimidazoline (PhIm),but 1:1 adducts with pyridine(Py) and n-propylaniline (P1NH2). The mechanism of the auxi-liary catalytic effect of nitrogen containing organic bases on the electrocatalytic reduction of CO2 with Co(Ⅱ)TMAPPI was discussed.
1990, 7(6): 61-63
Abstract:
dl-Naproxen (4) were obtained directly from 1-(6-methoxyl-2-naphthyl) propanone (2) via the catalytic aryl 1,2-rearrangement reaction in yield of 72.0%, which were resoluted by D-(-)-BGA (5) giving optical active s-(-)-Naproxen.
dl-Naproxen (4) were obtained directly from 1-(6-methoxyl-2-naphthyl) propanone (2) via the catalytic aryl 1,2-rearrangement reaction in yield of 72.0%, which were resoluted by D-(-)-BGA (5) giving optical active s-(-)-Naproxen.
1990, 7(6): 64-66
Abstract:
The beta-zeolites of various crystal size were synthesized by hydrothermal crystalli-zation. The effects of crystal size on the adsorption and diffusion on zeolite have been evaluated and discussed using cyclohexane,n-hexane and benzene as adsorbate.
The beta-zeolites of various crystal size were synthesized by hydrothermal crystalli-zation. The effects of crystal size on the adsorption and diffusion on zeolite have been evaluated and discussed using cyclohexane,n-hexane and benzene as adsorbate.
1990, 7(6): 67-69
Abstract:
Platinum plate modified with PVC membrane containing promethazine tetraphenylborate is used as an indicator electrode in zero-current oscillo-potentiometric titration of prometha-zine hydrochloride using sodium tetraphenylborate as titrant. The largest shift of the light-spot on the fluorescent screen indicates the end point of titration. This method is accurate,simple, directly visual and rapid.
Platinum plate modified with PVC membrane containing promethazine tetraphenylborate is used as an indicator electrode in zero-current oscillo-potentiometric titration of prometha-zine hydrochloride using sodium tetraphenylborate as titrant. The largest shift of the light-spot on the fluorescent screen indicates the end point of titration. This method is accurate,simple, directly visual and rapid.
1990, 7(6): 70-73
Abstract:
Three lanthanum solid complexes [LaL(NO3)2]NO3 (L represents bis-Schiff bases obtained from o-vanillin with ethylenediamine, o-phenylenediamine, and m-phenylenediamine) were synthesized.Their compositions,structures and properties were studied by elemental analyses,x-ray powder diffraction analyses, x-lay photoelectron spectra, infrared spectra, molar conductance,thermogravimetric (TG) and differential thermal analyses (DTA).
Three lanthanum solid complexes [LaL(NO3)2]NO3 (L represents bis-Schiff bases obtained from o-vanillin with ethylenediamine, o-phenylenediamine, and m-phenylenediamine) were synthesized.Their compositions,structures and properties were studied by elemental analyses,x-ray powder diffraction analyses, x-lay photoelectron spectra, infrared spectra, molar conductance,thermogravimetric (TG) and differential thermal analyses (DTA).
1990, 7(6): 74-76
Abstract:
A novel electrometric titration method-oscillographic coulometric titration is pro-posed,in which the oscillographic indication technique developed previously by one of the authors of this paper is used to indicate the end point of titration. Some examples of titration in redox system are given and briefly discussed.The results show that this method has the advantages of direct visual end point, simple manipulation and high sensitivity.
A novel electrometric titration method-oscillographic coulometric titration is pro-posed,in which the oscillographic indication technique developed previously by one of the authors of this paper is used to indicate the end point of titration. Some examples of titration in redox system are given and briefly discussed.The results show that this method has the advantages of direct visual end point, simple manipulation and high sensitivity.
1990, 7(6): 77-79
Abstract:
The electrochemical reduction of Nd3+ on platinum electrode in equal molar NaCl-KCl melt was found to proceed in two steps. One electron is involved in the first step,at which nothing was deposited on the surface of the electrode through controlled potential electrolysis.The final product of the second step was metallic Nd found by X-ray energy diffraction spectroscopy.
The electrochemical reduction of Nd3+ on platinum electrode in equal molar NaCl-KCl melt was found to proceed in two steps. One electron is involved in the first step,at which nothing was deposited on the surface of the electrode through controlled potential electrolysis.The final product of the second step was metallic Nd found by X-ray energy diffraction spectroscopy.
1990, 7(6): 80-81
Abstract:
The electrochemical corrosion of rare earth metal La and Nd in their molten halides has been investigated by means of weak polarization measurements. The current density of dissolution of La and Nd was 17.4 mA/cm2 and 29.9 mA/cm2 at 800℃, and 26mA/cm2 and 46.9 mA/cm2 at 860℃, respectively.
The electrochemical corrosion of rare earth metal La and Nd in their molten halides has been investigated by means of weak polarization measurements. The current density of dissolution of La and Nd was 17.4 mA/cm2 and 29.9 mA/cm2 at 800℃, and 26mA/cm2 and 46.9 mA/cm2 at 860℃, respectively.
1990, 7(6): 82-84
Abstract:
The surface modification of polytetrafluoroethylene film by exposuring to argon plasma was carried out and the structure of the surface was investigated by x-ray photoelectron spectroscopy (XPS). The broad, overlaping C1s peak in XPS spectrum was considered to be formed from 284.6(CH), 286.6(CO), 287.9(C=O), 289.0(CF) and 292.3 eV(CF2). It is found that, along with oxygen, nitrogen was also introduced into the surface structure of PTFE upon plasma treatment.
The surface modification of polytetrafluoroethylene film by exposuring to argon plasma was carried out and the structure of the surface was investigated by x-ray photoelectron spectroscopy (XPS). The broad, overlaping C1s peak in XPS spectrum was considered to be formed from 284.6(CH), 286.6(CO), 287.9(C=O), 289.0(CF) and 292.3 eV(CF2). It is found that, along with oxygen, nitrogen was also introduced into the surface structure of PTFE upon plasma treatment.
1990, 7(6): 85-87
Abstract:
The substituent effect on the UV and IR spectral properties of indolylchalcones has been studied. A linear Correlation between substituent constants σ and λmax in UV and vc-o in IR has been observed.
The substituent effect on the UV and IR spectral properties of indolylchalcones has been studied. A linear Correlation between substituent constants σ and λmax in UV and vc-o in IR has been observed.
1990, 7(6): 88-90
Abstract:
Eight alkoxy(aryloxy) propionitriles were synthesized by reaction of alcohols with acrylo-nitrile under ultrasonic irradiation in yield of 80~96.8%.
Eight alkoxy(aryloxy) propionitriles were synthesized by reaction of alcohols with acrylo-nitrile under ultrasonic irradiation in yield of 80~96.8%.
1990, 7(6): 91-93
Abstract:
Determination of L-DOPA by anodic stripping voltammetry on Nafion modified glassy carbon electrode has been catalyzed and improved with addition of sodium sulfate. The optimum condition of determination is described. The variation coefficient of six parallel de-terminations was 3.83% and the detection limit was 5.0×1.0-8 mol/L.The mechanism of the electrode reaction is briefiy discussed.
Determination of L-DOPA by anodic stripping voltammetry on Nafion modified glassy carbon electrode has been catalyzed and improved with addition of sodium sulfate. The optimum condition of determination is described. The variation coefficient of six parallel de-terminations was 3.83% and the detection limit was 5.0×1.0-8 mol/L.The mechanism of the electrode reaction is briefiy discussed.
