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2001 Volume 18 Issue 12
2001, 18(12): 939-943
Abstract:
The linear poly(ether urethane)(PEG-PU) was synthesized by solution polymerization and a series of solid polymer electrolytes based on the complexes of poly(ether urethane) with sodium perchlorate (NaClO4) were prepared. Fourier transform-Infrared spectroscopy (FT-IR), Fourier transform-Raman spectroscopy(FT-Raman) and complex impedance analysis were used to investigate the polymer-ion interaction and ionic conductive property of the products. The results showed that the oxygen atoms of the carbonyl and ether oxygen groups have different coordination abilities for sodium cation. Both carbonyl and ether oxygen group participate in the ionic transport process in PU-based electrolytes. The ionic conductivity of the complex membrane increases with the increase of temperature. In a certain range of temperature (25~100℃), ionic conductivity of PEG-PU/NaClO4 complex membrane follows the Arrhenius equation. It has been also found that, when the mole ratio of the ether oxygen to sodium cation is about 12, the PEG-PU/NaClO4 complex exhibits a maximum ionic conductivity.
The linear poly(ether urethane)(PEG-PU) was synthesized by solution polymerization and a series of solid polymer electrolytes based on the complexes of poly(ether urethane) with sodium perchlorate (NaClO4) were prepared. Fourier transform-Infrared spectroscopy (FT-IR), Fourier transform-Raman spectroscopy(FT-Raman) and complex impedance analysis were used to investigate the polymer-ion interaction and ionic conductive property of the products. The results showed that the oxygen atoms of the carbonyl and ether oxygen groups have different coordination abilities for sodium cation. Both carbonyl and ether oxygen group participate in the ionic transport process in PU-based electrolytes. The ionic conductivity of the complex membrane increases with the increase of temperature. In a certain range of temperature (25~100℃), ionic conductivity of PEG-PU/NaClO4 complex membrane follows the Arrhenius equation. It has been also found that, when the mole ratio of the ether oxygen to sodium cation is about 12, the PEG-PU/NaClO4 complex exhibits a maximum ionic conductivity.
2001, 18(12): 944-947
Abstract:
The low melting point derivatives and the hydrophilic derivatives of niclosamide were designed and prepared to enhance the transdemal rate of niclosamide. Lowering the melting point of niclosamide by esterification with fatty acid did not have much effect on increasing the transdermal flux of niclosamide. However, the trend was evident that the lower the melting point, the greater the transdermal flux. Drugs with suitable octanol/water partition coefficient had great transdermal rate. The transdermal therapeutic system of complexing niclosamide with ethanolamine showed a more promising future than that of niclosamide for schistosomiasis control.
The low melting point derivatives and the hydrophilic derivatives of niclosamide were designed and prepared to enhance the transdemal rate of niclosamide. Lowering the melting point of niclosamide by esterification with fatty acid did not have much effect on increasing the transdermal flux of niclosamide. However, the trend was evident that the lower the melting point, the greater the transdermal flux. Drugs with suitable octanol/water partition coefficient had great transdermal rate. The transdermal therapeutic system of complexing niclosamide with ethanolamine showed a more promising future than that of niclosamide for schistosomiasis control.
2001, 18(12): 948-952
Abstract:
Poly(2,2'-diaminophenyloxydisulfide)(PDAPO) has been prepared by consecutive cyclic voltammetry. The polymer is characterized by FT-IR, FT-Raman spectra, X-ray photoelectron spectroscopy(XPS), and elemental analysis. In comparison of the shape and response of the cyclic voltammogram of the polymer with those of its monomer, it become clear that the redox process of the PDAPO is more reversible than the other oganodisulfide polymers owing to the intramolecular electrocatalytic effect of polyaniline and the strong electron-donating effect of -O-S-S-O- bonds in the polymer structure. The electric conductivity, thermal stability and surface morphology also have been investigated. The results show that PDAPO is a highly electroactive and electroconducting polymer which could be used as a novel positive material for lithium battery or lithium secondary battery.
Poly(2,2'-diaminophenyloxydisulfide)(PDAPO) has been prepared by consecutive cyclic voltammetry. The polymer is characterized by FT-IR, FT-Raman spectra, X-ray photoelectron spectroscopy(XPS), and elemental analysis. In comparison of the shape and response of the cyclic voltammogram of the polymer with those of its monomer, it become clear that the redox process of the PDAPO is more reversible than the other oganodisulfide polymers owing to the intramolecular electrocatalytic effect of polyaniline and the strong electron-donating effect of -O-S-S-O- bonds in the polymer structure. The electric conductivity, thermal stability and surface morphology also have been investigated. The results show that PDAPO is a highly electroactive and electroconducting polymer which could be used as a novel positive material for lithium battery or lithium secondary battery.
2001, 18(12): 953-957
Abstract:
The electrochemical behavior of nanosized α-PbO doped MnO2 electrodes have been investigated by means of cyclic voltammetry. The results indicated that the nanosized α-PbO samples have better electrochemical activity than the conventional α-PbO samples. The charge-discharge mechanism of the modified MnO2 changed because of the formation of stable complexes from Pb(X)(X=0,Ⅱ) with Mn(Y)(Y=Ⅳ,Ⅲ,Ⅱ) atoms. These complexes could be cooxided and coreduced, and thus restrained the formation of poorly electrochemical active Mn3O4, as a results the reversibility of MnO2 electrode were improved. The discharge mechanism of MnO2 doped with nanosized α-PbO sample was similar to that of doped with conventional α-PbO sample. But the nanosized α-PbO have a better electrochemical activity than the conventional α-PbO doped MnO2 electrodes
The electrochemical behavior of nanosized α-PbO doped MnO2 electrodes have been investigated by means of cyclic voltammetry. The results indicated that the nanosized α-PbO samples have better electrochemical activity than the conventional α-PbO samples. The charge-discharge mechanism of the modified MnO2 changed because of the formation of stable complexes from Pb(X)(X=0,Ⅱ) with Mn(Y)(Y=Ⅳ,Ⅲ,Ⅱ) atoms. These complexes could be cooxided and coreduced, and thus restrained the formation of poorly electrochemical active Mn3O4, as a results the reversibility of MnO2 electrode were improved. The discharge mechanism of MnO2 doped with nanosized α-PbO sample was similar to that of doped with conventional α-PbO sample. But the nanosized α-PbO have a better electrochemical activity than the conventional α-PbO doped MnO2 electrodes
2001, 18(12): 958-961
Abstract:
The transparent TiO2 thin films deposited on glass substrates were prepared by a sol-gel method. The effects of heat-treatment temperature, coating thickness and Fe2O3-doping were studied. Methyl violet was found to be easily photodegraded using by TiO2 film coated on glass as a photocatalyst in an aqueous solution. The Fe2O3-doped TiO2 film could enhance the degradation significantly.
The transparent TiO2 thin films deposited on glass substrates were prepared by a sol-gel method. The effects of heat-treatment temperature, coating thickness and Fe2O3-doping were studied. Methyl violet was found to be easily photodegraded using by TiO2 film coated on glass as a photocatalyst in an aqueous solution. The Fe2O3-doped TiO2 film could enhance the degradation significantly.
2001, 18(12): 962-966
Abstract:
Solvent extraction of aurocyanide from alkaline cyanide solution with five extractants:amide(N503), secondary amine(7203), tri-alkylguanidine(Lix7825), quaternary ammonium chloride(N263) and tributyl phosphate(TBP) has been studied. The factors that could effect the extraction of the metal such as equilibrium time, aqueous pH, saturation capacity, separation factors of gold and silver(Ⅰ), ferrous(Ⅱ), copper(Ⅰ), nickel(Ⅱ), zine(Ⅱ) are discussed and determined. The order of extraction ability of the five extraction systems for aurocyanide from alkaline cyanide solution as follows: N263> Lix7825> 7203> N503> TBP, same as the alkalinity order of the extractants, but in a reverse order to the selectivity and saturation capacity for aurocyanide. The above results have been proved in the case of synthetic solution in a single extraction and leach liquors of a gold concentrate in three stages contiuous extraction.
Solvent extraction of aurocyanide from alkaline cyanide solution with five extractants:amide(N503), secondary amine(7203), tri-alkylguanidine(Lix7825), quaternary ammonium chloride(N263) and tributyl phosphate(TBP) has been studied. The factors that could effect the extraction of the metal such as equilibrium time, aqueous pH, saturation capacity, separation factors of gold and silver(Ⅰ), ferrous(Ⅱ), copper(Ⅰ), nickel(Ⅱ), zine(Ⅱ) are discussed and determined. The order of extraction ability of the five extraction systems for aurocyanide from alkaline cyanide solution as follows: N263> Lix7825> 7203> N503> TBP, same as the alkalinity order of the extractants, but in a reverse order to the selectivity and saturation capacity for aurocyanide. The above results have been proved in the case of synthetic solution in a single extraction and leach liquors of a gold concentrate in three stages contiuous extraction.
2001, 18(12): 967-970
Abstract:
Condensation of ethylferrocne with methyl levulinate was carried out in cyclohexane and catalyzed by PPA-H2SO4-CH3OH to give methyl 4,4-bis(ethylferrocenyl) pentanate with conversion of 73% and the yield of 84%. The suitable reagent compositions obtained through orthogonal factorization method were 55 mmol ethyferrocene, 75 mmol methyl levulinate, 3.0 mL concentrated H2SO4, 20 mL cyclohexane and 11 mL of methanol. The structures of the compounds have been characterized by elemental analysis, IR, 1H NMR and 13C NMR.
Condensation of ethylferrocne with methyl levulinate was carried out in cyclohexane and catalyzed by PPA-H2SO4-CH3OH to give methyl 4,4-bis(ethylferrocenyl) pentanate with conversion of 73% and the yield of 84%. The suitable reagent compositions obtained through orthogonal factorization method were 55 mmol ethyferrocene, 75 mmol methyl levulinate, 3.0 mL concentrated H2SO4, 20 mL cyclohexane and 11 mL of methanol. The structures of the compounds have been characterized by elemental analysis, IR, 1H NMR and 13C NMR.
2001, 18(12): 971-974
Abstract:
The total synthesis of 3,7-dimethyl-2-tridecanyl acetate, the active component of the sex pheromone of Diprion pini has been investigated. A new synthesis method of rac-3,7-dimethyl-2-tridecanyl acetate was proposed. 1-Bromo-2-methyl-octan-1-yl lithium was obtained from n-octanol for the first time, and 3,4-dimethyl-Ⅴ-butyrolactone was obtained from diethyl malonate and 2,3-epoxybutane. 2-Methyl-octan-1-yl lithium reacted with 3,4-dimethyl-Ⅴ-butyrolactone to give the ketoalcohol which via Huang-Minlong reaction afforded 3,7-dimethyl-2-tridecanol, and gave 3,7-dimethyl-2-tridecanyl acetate after acylation.
The total synthesis of 3,7-dimethyl-2-tridecanyl acetate, the active component of the sex pheromone of Diprion pini has been investigated. A new synthesis method of rac-3,7-dimethyl-2-tridecanyl acetate was proposed. 1-Bromo-2-methyl-octan-1-yl lithium was obtained from n-octanol for the first time, and 3,4-dimethyl-Ⅴ-butyrolactone was obtained from diethyl malonate and 2,3-epoxybutane. 2-Methyl-octan-1-yl lithium reacted with 3,4-dimethyl-Ⅴ-butyrolactone to give the ketoalcohol which via Huang-Minlong reaction afforded 3,7-dimethyl-2-tridecanol, and gave 3,7-dimethyl-2-tridecanyl acetate after acylation.
2001, 18(12): 975-978
Abstract:
The effects of 60Co-γ irradiation on N,N'-methylenebisacrylamide were studied. The fragments having double bond under irradiation were measured. Effects of radiation on the structure of the solid N,N'-methylenebisacrylamide and its aqueous solution had been discussed. Experiment results show that N,N'-MBAA is easily polymerized at relative high temperature, so that radiation-induced crosslinking of PVA in the presence of irradiated N,N'-MBAA should be carried out at room temperature.
The effects of 60Co-γ irradiation on N,N'-methylenebisacrylamide were studied. The fragments having double bond under irradiation were measured. Effects of radiation on the structure of the solid N,N'-methylenebisacrylamide and its aqueous solution had been discussed. Experiment results show that N,N'-MBAA is easily polymerized at relative high temperature, so that radiation-induced crosslinking of PVA in the presence of irradiated N,N'-MBAA should be carried out at room temperature.
2001, 18(12): 979-982
Abstract:
The anode powder from waste MH/Ni batteries was regenerated by chemical and melting methods. The structure of the regenerated alloy was examined by XRD. The experimental results showed that the alloy structure is of CaCu5 type. The constant-current charge/discharge test was carried out for the original alloy and the regenerated alloy, both showed almost the same discharging capacities of 295 mA·h/g at 0.2 C rate, but the discharge potential of the regenerated alloy was about 20 mV higher than that of the original alloy. The results of the cyclic tests at 1 C rate showed that the capacity reduction of the regenerated alloy was only 27% less than that of the original alloy.
The anode powder from waste MH/Ni batteries was regenerated by chemical and melting methods. The structure of the regenerated alloy was examined by XRD. The experimental results showed that the alloy structure is of CaCu5 type. The constant-current charge/discharge test was carried out for the original alloy and the regenerated alloy, both showed almost the same discharging capacities of 295 mA·h/g at 0.2 C rate, but the discharge potential of the regenerated alloy was about 20 mV higher than that of the original alloy. The results of the cyclic tests at 1 C rate showed that the capacity reduction of the regenerated alloy was only 27% less than that of the original alloy.
2001, 18(12): 983-986
Abstract:
A simulated occlusion cell is used in studying the effect of halide anions on the activation of Al-alloy anodes. Halide anions in solution could transfer into the occluded sections with different rate, and change the potential of zero charge of Al anode in different level. The active order of Al-alloy anode in halide solutions were found to be I-> Cl-> Br-.
A simulated occlusion cell is used in studying the effect of halide anions on the activation of Al-alloy anodes. Halide anions in solution could transfer into the occluded sections with different rate, and change the potential of zero charge of Al anode in different level. The active order of Al-alloy anode in halide solutions were found to be I-> Cl-> Br-.
2001, 18(12): 987-990
Abstract:
The electrochemical behavior of V2O3, V2O5 and NH4VO3 at carbon paste electrode(CPE) in H2SO4 solution were investigated by cyclic voltammetry. The results showed that for vanadium(Ⅲ) compound there appeared two reduction peaks but three oxidation peaks in cyclic voltammograms in different H2SO4 concentration solutions, while for two vanadium(Ⅴ) compounds there were four reduction peaks and four oxidation peaks, quite close to each other. The corresponding redox peaks were reasonably analyzed and the reaction mechanism has been discussed briefly.
The electrochemical behavior of V2O3, V2O5 and NH4VO3 at carbon paste electrode(CPE) in H2SO4 solution were investigated by cyclic voltammetry. The results showed that for vanadium(Ⅲ) compound there appeared two reduction peaks but three oxidation peaks in cyclic voltammograms in different H2SO4 concentration solutions, while for two vanadium(Ⅴ) compounds there were four reduction peaks and four oxidation peaks, quite close to each other. The corresponding redox peaks were reasonably analyzed and the reaction mechanism has been discussed briefly.
2001, 18(12): 991-993
Abstract:
The copolymerization of tert-butyl-3-isopropenylcumylperoxide(D120) with vinyl acetate has been studied.The copolymer with pendant peroxide groups was obtained by the free radical poly-merization. The Mn of the copolymers were about 12 000~14 000 and did not changed with the D120 content in the comonomers. It was found that the decomposition temperature of the peroxide group in the copolymers decreased with the increase in content of D120 units in the copolymer. The reactivity ratio based on Kelen-Tudos method was measured to be: rD120=0.0126,rVAC=2.39. The effect of the amount of D120 units in copolymers on tensile strength of copolymer film were investigated also.
The copolymerization of tert-butyl-3-isopropenylcumylperoxide(D120) with vinyl acetate has been studied.The copolymer with pendant peroxide groups was obtained by the free radical poly-merization. The Mn of the copolymers were about 12 000~14 000 and did not changed with the D120 content in the comonomers. It was found that the decomposition temperature of the peroxide group in the copolymers decreased with the increase in content of D120 units in the copolymer. The reactivity ratio based on Kelen-Tudos method was measured to be: rD120=0.0126,rVAC=2.39. The effect of the amount of D120 units in copolymers on tensile strength of copolymer film were investigated also.
2001, 18(12): 994-997
Abstract:
The electrochemical method is used to study the interactions between neutral Red and CT-DNA. It was found that it is intercalation binding between neutral red and CT-DNA, when the pH of the solution is 7.0; and it is electrostatic binding between neutral red and CT-DNA, when the pH of the solution is 6.0. The UV-visible spectroscopic study further demonstrate the above results.
The electrochemical method is used to study the interactions between neutral Red and CT-DNA. It was found that it is intercalation binding between neutral red and CT-DNA, when the pH of the solution is 7.0; and it is electrostatic binding between neutral red and CT-DNA, when the pH of the solution is 6.0. The UV-visible spectroscopic study further demonstrate the above results.
2001, 18(12): 998-1000
Abstract:
(Z)-3-dodecen-1-yl(E)-2-butenoate was synthesized starting from acetylene. The key feature of this approach is use of ethylene diamine in the reaction of acetylene and sodium amide for synthesizing 1-decyne. This reaction allowed a convenient preparation of terminal alkyne with a long chain from cheap and common chemicals. The title sex pheromone synthesized showed highly attractant activity in the field to cylas formicarius fabricius.
(Z)-3-dodecen-1-yl(E)-2-butenoate was synthesized starting from acetylene. The key feature of this approach is use of ethylene diamine in the reaction of acetylene and sodium amide for synthesizing 1-decyne. This reaction allowed a convenient preparation of terminal alkyne with a long chain from cheap and common chemicals. The title sex pheromone synthesized showed highly attractant activity in the field to cylas formicarius fabricius.
2001, 18(12): 1001-1003
Abstract:
p-Chlorophenylhydrazine hydrochloride was synthesized from p-chloroaniline through diazotization followed by Na2SO3 reduction. The p-chloroaniline is at first diazotized in dilute hydrochloride acid and PEG-600, and then the solution of diazonium hydrochloride was reduced by droping into Na2SO3 solution at 70℃, and acided in 20%~25% of hydrochloride acid. The yield was above 84.5%(with purity≥99.5% by HPLC). The following reagent ratios were used in synthesis: n(p-chlorlaniline):n(sodium nitrite):n(hydrochloride acid):n(sodium sulfite)=1.0: 1.02: 3.0: 2.5.
p-Chlorophenylhydrazine hydrochloride was synthesized from p-chloroaniline through diazotization followed by Na2SO3 reduction. The p-chloroaniline is at first diazotized in dilute hydrochloride acid and PEG-600, and then the solution of diazonium hydrochloride was reduced by droping into Na2SO3 solution at 70℃, and acided in 20%~25% of hydrochloride acid. The yield was above 84.5%(with purity≥99.5% by HPLC). The following reagent ratios were used in synthesis: n(p-chlorlaniline):n(sodium nitrite):n(hydrochloride acid):n(sodium sulfite)=1.0: 1.02: 3.0: 2.5.
2001, 18(12): 1004-1006
Abstract:
A series of poly(aryl ether ketone ketone)(PEKK) copolymers of high molecular weight have been synthesized at -15~25℃ by solution polycondensation of diphenyl ether(DPE), tetraphthaloyl chloride(TPC) and dibenzo-p-dioxin(ODP) using AlCl3 as a catalyst, 1,2-dichloroethane and NMP as solvents. The copolymers have been characterrized by DSC and WAXD. The results showed that the Tg of the copolymers increase, the Tm and crytallinity decrease with increase in dibenzo-p-dioxin fragments. The copolymers still have excellent heat and solvent-resistance as pure PEKK.
A series of poly(aryl ether ketone ketone)(PEKK) copolymers of high molecular weight have been synthesized at -15~25℃ by solution polycondensation of diphenyl ether(DPE), tetraphthaloyl chloride(TPC) and dibenzo-p-dioxin(ODP) using AlCl3 as a catalyst, 1,2-dichloroethane and NMP as solvents. The copolymers have been characterrized by DSC and WAXD. The results showed that the Tg of the copolymers increase, the Tm and crytallinity decrease with increase in dibenzo-p-dioxin fragments. The copolymers still have excellent heat and solvent-resistance as pure PEKK.
2001, 18(12): 1007-1008
Abstract:
Effects of aqueous salt solutions on the absorbency of superabsorbents synthesized by inverse suspension copolymerization of acrylic acid with acrylamide were studied. The results showed that the water absorbency of superabsorbents in the salt solutions decreased with increase in the ionic strength of the salt. For the same ionic strength of chloride salt solutions, the water absorbency had the following tendency: Na+> Ca2+> Fe3+,Li+> Na+> K+, and Mg2+> Ca2+> Ba2+. The influences of anion valency of salts with a common cationic ion(Na+) on the water absorbency were the order of mononalent< divalent< trivalent anions.
Effects of aqueous salt solutions on the absorbency of superabsorbents synthesized by inverse suspension copolymerization of acrylic acid with acrylamide were studied. The results showed that the water absorbency of superabsorbents in the salt solutions decreased with increase in the ionic strength of the salt. For the same ionic strength of chloride salt solutions, the water absorbency had the following tendency: Na+> Ca2+> Fe3+,Li+> Na+> K+, and Mg2+> Ca2+> Ba2+. The influences of anion valency of salts with a common cationic ion(Na+) on the water absorbency were the order of mononalent< divalent< trivalent anions.
2001, 18(12): 1009-1011
Abstract:
Five quinolone antibiotics were determined by oscillographic chronopotentiometry, using a buffer solution of 0.20 mol/L KH2PO4-NaOH(pH=6.8). The sensitivity incisions for enoxacin(ENX), ciprofloxacin(CPLX), ofloxacin(OFLX), fleroxacin(FLRX) and sparfloxacin(SPLX) in result of redox reaction on the hang-Hg electrode were observed on the oscillograms at -1.31 V、-1.44 V、 -1.36 V、 -1.28 V、 -1.62 V, respectively. The incision heights were linearly proportional to the drug concentration respectively in the range of 7.35~64.2, 16.0~80.7, 4.00~36 7, 12.6~200.0, 9.8~83.4 mg/L with relative standard deviations of 0.7%~1.6%. The experiment results showed that quinolone antibiotics exhibited electrochemical activity. The method has advantages of simplicity, convenience and avoiding from interferences.
Five quinolone antibiotics were determined by oscillographic chronopotentiometry, using a buffer solution of 0.20 mol/L KH2PO4-NaOH(pH=6.8). The sensitivity incisions for enoxacin(ENX), ciprofloxacin(CPLX), ofloxacin(OFLX), fleroxacin(FLRX) and sparfloxacin(SPLX) in result of redox reaction on the hang-Hg electrode were observed on the oscillograms at -1.31 V、-1.44 V、 -1.36 V、 -1.28 V、 -1.62 V, respectively. The incision heights were linearly proportional to the drug concentration respectively in the range of 7.35~64.2, 16.0~80.7, 4.00~36 7, 12.6~200.0, 9.8~83.4 mg/L with relative standard deviations of 0.7%~1.6%. The experiment results showed that quinolone antibiotics exhibited electrochemical activity. The method has advantages of simplicity, convenience and avoiding from interferences.
2001, 18(12): 1012-1013
Abstract:
The ultrafiltration membrane was prepared from an aromatic polyamide containing 1,2-dihydro-4-phenyl(2H)phthalazinone moiety it is soluble in DMAc, DMF, NMP, DMSO and m-cresol. The effects of solvents, polymer concentration, additive, and temperature of gel bath on the membrane performance were studied. While DMAc was used as solvent and ethylene glycol methylether or diethyl ether was used as additive, the rejection against PEG12000 was up to 100% under 0.1 MPa.
The ultrafiltration membrane was prepared from an aromatic polyamide containing 1,2-dihydro-4-phenyl(2H)phthalazinone moiety it is soluble in DMAc, DMF, NMP, DMSO and m-cresol. The effects of solvents, polymer concentration, additive, and temperature of gel bath on the membrane performance were studied. While DMAc was used as solvent and ethylene glycol methylether or diethyl ether was used as additive, the rejection against PEG12000 was up to 100% under 0.1 MPa.
2001, 18(12): 1014-1016
Abstract:
Four di(phenyl sulphinyl) alkane were synthesized by oxidation of corresponding sulfide with nitric acid and characterized by elemental analysis, IR and NMR spectroscopy. The method has the advantages of high purity of the intermediates and high yield of the end products.
Four di(phenyl sulphinyl) alkane were synthesized by oxidation of corresponding sulfide with nitric acid and characterized by elemental analysis, IR and NMR spectroscopy. The method has the advantages of high purity of the intermediates and high yield of the end products.
2001, 18(12): 1017-1018
Abstract:
The terpene resin was subjected to hydrosilylation with trichlorosilane and dichloro-methylsilane to give a product with 42.6% silicone repeating units. It could be used to modify the surface of wollastonite and carbon black in the coatings for road marking and amino coatings.
The terpene resin was subjected to hydrosilylation with trichlorosilane and dichloro-methylsilane to give a product with 42.6% silicone repeating units. It could be used to modify the surface of wollastonite and carbon black in the coatings for road marking and amino coatings.
2001, 18(12): 1019-1021
Abstract:
The competitive adsorption of phenol and p-chlorophenol on polystyrene-based resin NKA has been studied using a bottle point isotherm procedure. The mathematical models of Ideal Adsorbed Solution(IAS) and Langmuir Competitive Adsorption(LCA) have been tested for predicting the competitive adsorption behavior of phenol and p-chlorophenol in aqueous solution. The results obtained appeared satisfactory.
The competitive adsorption of phenol and p-chlorophenol on polystyrene-based resin NKA has been studied using a bottle point isotherm procedure. The mathematical models of Ideal Adsorbed Solution(IAS) and Langmuir Competitive Adsorption(LCA) have been tested for predicting the competitive adsorption behavior of phenol and p-chlorophenol in aqueous solution. The results obtained appeared satisfactory.
2001, 18(12): 1022-1024
Abstract:
The perturbations of ATP on oscillatory reactions of monose (fructose or glucose)-acetone-Mn2+-BrO3--H2SO4 systems were investigated. The experimental results show that the induced times and periods of the oscillating reactions are increased with ATP concentration. The kinetics behaviour of the pertubation is explained by FKN mechanism.
The perturbations of ATP on oscillatory reactions of monose (fructose or glucose)-acetone-Mn2+-BrO3--H2SO4 systems were investigated. The experimental results show that the induced times and periods of the oscillating reactions are increased with ATP concentration. The kinetics behaviour of the pertubation is explained by FKN mechanism.
