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大肠杆菌poly(A)化mRNA基因片段的RD-PCR克隆 被引量:1
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作者 胡子有 马文丽 +5 位作者 宋艳斌 张宝 吴清华 郭秋野 彭翼飞 郑文岭 《第一军医大学学报》 CSCD 北大核心 2002年第3期203-205,共3页
目的研究大肠杆菌(E.coli)中哪些基因mRNA3'端存在poly(A)化。方法利用E.colimRNA中可能存在的poly(A)尾,以oligo(dT)-cellulose进行mRNA的纯化,并以oligo(dT)18为引物逆转录合成cDNA,应用限制性显示-聚合酶链反应(RD-PCR)分离不同... 目的研究大肠杆菌(E.coli)中哪些基因mRNA3'端存在poly(A)化。方法利用E.colimRNA中可能存在的poly(A)尾,以oligo(dT)-cellulose进行mRNA的纯化,并以oligo(dT)18为引物逆转录合成cDNA,应用限制性显示-聚合酶链反应(RD-PCR)分离不同组别的基因片段并进行克隆。结果成功克隆100多个基因片段,并对其中30个进行了测序分析。结论细菌mRNA的poly(A)化可能不是偶然和个别的现象。 展开更多
关键词 限制性显示-聚合酶链反应 E.COLI poly(A) 基因克隆 大肠杆菌 PD-PCR
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聚己内酯-碳酸亚乙酯[Poly(CL-EC)]和血管内皮生长因子(VEGF)静电混纺支架的构建及其生物学性能 被引量:1
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作者 史振宇 张祥满 +1 位作者 陈枫 符伟国 《复旦学报(医学版)》 CAS CSCD 北大核心 2015年第1期50-56,共7页
目的以聚己内酯-碳酸亚乙酯[Poly(CL-EC)]共聚物混合血管内皮生长因子(vascular endothelial growth factor,VEGF),采用静电纺的方法构建纳米支架并检测其生物学性能。方法按照EC/CL共聚物比例为1∶9、1∶6、1∶4,Poly(CL-EC)浓度分别... 目的以聚己内酯-碳酸亚乙酯[Poly(CL-EC)]共聚物混合血管内皮生长因子(vascular endothelial growth factor,VEGF),采用静电纺的方法构建纳米支架并检测其生物学性能。方法按照EC/CL共聚物比例为1∶9、1∶6、1∶4,Poly(CL-EC)浓度分别为5%、10%、15%电纺纤维膜,分析电纺纤维膜的表征和力学性能。然后将VEGF按照0ng/g、10ng/g、100ng/g、1μg/g的质量比与Poly(CL-EC)溶液混合,电纺制备纳米支架。对混纺膜进行细胞增殖和黏附试验、乳酸脱氢酶(lactate dehydrogenase,LDH)释放试验、间接溶血试验和皮下植入试验等检测。结果根据Poly(CL-EC)电纺纤维膜的表征和力学性能,我们选用EC/CL比例为1∶6的10%Poly(CL-EC)与VEGF构建混合电纺膜。细胞增殖和黏附试验证实Poly(CL-EC)/VEGF电纺膜具有良好的细胞相容性,尤其是血管内皮细胞;LDH释放试验、接触溶血试验和体内植入试验显示该材料无细胞毒性、有较好的血液相容性和很低的异物反应。结论静电纺构建的Poly(CL-EC)/VEGF具有良好的生物学性能,能够作为组织工程支架材料。 展开更多
关键词 聚己内酯-碳酸亚乙酯[poly(CL-EC)] 血管内皮生长因子(VEGF) 静电纺 生物学性能
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含聚1,3-二氧戊环链段聚合物网络Poly(AA-b-DXL)溶胀度的影响因素研究 被引量:1
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作者 杜鹃 彭宇行 +2 位作者 丁小斌 郑朝晖 张文传 《高分子学报》 SCIE CAS CSCD 北大核心 2002年第2期227-229,共3页
继报道了含聚 1,3 二氧戊环 (PDXL)链段具有pH敏感性的可解体聚合物网络Poly(AA b DXL)的制备后 ,对网络的溶胀性能进行了更为详细和深入的研究 .由PDXL与PAA两种亲水性链段组成的网络不仅具有pH敏感性 ,而且可在水中及有机溶剂中溶胀 ... 继报道了含聚 1,3 二氧戊环 (PDXL)链段具有pH敏感性的可解体聚合物网络Poly(AA b DXL)的制备后 ,对网络的溶胀性能进行了更为详细和深入的研究 .由PDXL与PAA两种亲水性链段组成的网络不仅具有pH敏感性 ,而且可在水中及有机溶剂中溶胀 .研究表明溶剂的溶度参数及网络的结构与组成对网络的溶胀性能有显著的影响 ; 展开更多
关键词 聚1 3-二氧戊环 亲水性网络 PH敏感性 聚合物网络 丙烯酸 poly 溶胀度
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A novel thermoregulated phosphine ligand used for the Rh-catalyzed hydroformylation of mixed C_(11-12) olefins in aqueous/organic biphasic system 被引量:2
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作者 Zhi Jiang Ji,Jing Yang Jiang,Yan Hua Wang State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116012,China 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第5期515-518,共4页
A novel thermoregulated phosphine ligand PhP(CHCHO)CH(n=22) was synthesized and used for the Rh-catalyzed hydroformylation of mixed Colefins in aqueous/organic biphasic system.Under the optimized conditions,pressure =... A novel thermoregulated phosphine ligand PhP(CHCHO)CH(n=22) was synthesized and used for the Rh-catalyzed hydroformylation of mixed Colefins in aqueous/organic biphasic system.Under the optimized conditions,pressure =5 MPa (H:CO=1:1),phosphine/Rh =13(molar ratio),reaction time =6 h and temperature =130℃,the conversion of Colefins and the yield of aldehyde are 99%and 94%,respectively.The catalyst retained in aqueous phase can be easily separated from the product-containing organic phase by simple phase separation and the catalytic activity remains almost constant after four consecutive cycles. 展开更多
关键词 Thermoregulated phosphine ligand Mixed C11-12 olefins HYDROFORMYLATION RHODIUM
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Highly Heat-Resistant Materials for Microelectronics:Hydrodynamic,Optical,and Conformational Properties of Fluorine Containing Poly(Amido-ortho-Hydroxy Amide) 被引量:1
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作者 Irina A Strelina Liudmila I Rudaya +5 位作者 Ol’ga V Okatova Maxim N Bol’shakov Aleksey YuMarfichev Galina K Lebedeva Yuliya V Shagayko Stanislav M Ramsh 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第1期223-230,共8页
The polycondensation of the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline(molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize poly(amido-o-hydrox... The polycondensation of the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline(molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize poly(amido-o-hydroxy amide)(POA-F)-new heat resistant binder of the composites for microelectronics. The copolymer was fractionated, its hydrodynamic, optical, and conformational properties were researched, and molecular masses(ММ) of the fractions were defined. The polydispersity index was estimated. Based on experimental data, calculation of the size of a segment of Kuhn characterizing degree of an intramolecular orientation order and value of coefficients of the equation of Mark-Kuhn-Hauvink for viscometric and diffusion data were performed. It was demonstrated that introducing 20 mol % of the monomer with-CF3-groups does not lead to any changes in conformational properties of the macromolecules and does not change the degree of intramolecular orientational order(the Kuhn segment length). Optical characteristics of POA-F solutions are virtually similar to the corresponding values for POA prepared with the use of single amine-containing component-5,5-methylene bis(2-aminophenol). The received MM distribution for POA-F(prepolymer) provided the solubility of its films in alkaline solutions. The heat resistance(τ5 and τ10-temperatures corresponding to 5% and of 10% PBO-F mass loss of a polymer) of the powders and the films of PBO, PBO-F were determined. The electrophysical parameters-dielectric permittivity(ε) and dielectric loss tangent(tan δ) of the PBO-F films decreased down to 3.30 and 0.017, in comparison 3.40 and 0.025 for PBO respectively. 展开更多
关键词 poly(o-hydroxy amide) 4 4-(hexafluoroisopropylidene) dianiline Kuhn segment Mark-Kuhn-Houwink equations translational diffusion intrinsic viscosity flow birefringence
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Permeation Characteristics of Light Hydrocarbons Through Poly(amide-6-β-ethylene oxide) Multilayer Composite Membranes 被引量:1
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作者 任晓灵 任吉中 +1 位作者 李晖 邓麦村 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第3期232-237,共6页
In this paper, poly(amide-6-β-ethylene oxide) (PEBA1657) copolymer was used to prepare multilayer polyetherimide (PEI)/polydimethylsiloxane (PDMS)/PEBA1657/PDMS composite membranes by dip-coating method. Permeation b... In this paper, poly(amide-6-β-ethylene oxide) (PEBA1657) copolymer was used to prepare multilayer polyetherimide (PEI)/polydimethylsiloxane (PDMS)/PEBA1657/PDMS composite membranes by dip-coating method. Permeation behaviors of ethylene, ethane, propylene, propane, n-butane, methane and nitrogen through the multilayer composite membranes were investigated over a range of operating temperature and pressure. The permeances of light hydrocarbons through PEI/PDMS/PEBA1657/PDMS composite membranes increase with their increasing condensability, and the olefins are more permeable than their corresponding paraffins. For light hydrocarbons, the gas permeances increase significantly as temperature increasing. When the transmembrane pressure difference increases, the gas permeance increases moderately due to plasticization effect, while their apparent activation energies for permeation decrease. 展开更多
关键词 poly(amide-6-β-ethylene oxide) light hydrocarbons multilayer composite membrane TRANSPORT
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SYNTHESIS AND CHARACTERIZATION OF POLY{4-[2-(tert-BUTYLDIMETHYLSILOXY)ETHYL]STYRENE}AND ITS HYDROLYSIS DERIVATIVE 被引量:1
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作者 郭文莉 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2009年第3期399-405,共7页
The living cationic polymerization of 4-[2-(tert-butyldimethylsiloxy)ethyl]styrene (TBDMES) was studied in methylcyclohexane (MeChx)/methylchloride (MeCl) (50/50 V/V) solvent mixture at -80 degrees C. The initiator 1,... The living cationic polymerization of 4-[2-(tert-butyldimethylsiloxy)ethyl]styrene (TBDMES) was studied in methylcyclohexane (MeChx)/methylchloride (MeCl) (50/50 V/V) solvent mixture at -80 degrees C. The initiator 1,1-diphenylethylene (DPE) capped 2-chloro-2,4,4-trimethylpentane (TMPCl) was formed in situ in conjunction with titanium tetrachloride (TiCl(4)). The Lewis acidity of TiCl(4) was decreased by the addition of titanium(IV) isopropoxide (Ti(OiPr)(4)) to accomplish living polymerization of TBDMES. Hydrolysis of poly(TBDMES) in the presence of tetra-butylammonium fluoride yielded poly[4-(2-hydroxyethyl)styrene] (poly(HOES)). FT-IR, NMR and DSC demonstrated the hydrolysis was complete. 展开更多
关键词 Living carbocationic polymerization poly[4-(2-hydroxyethyl)styrene] HYDROLYSIS Pendant hydroxyl groups
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STRUCTURE AND PROPERTIES OF PHOSPHROUS-CONTAINING POLY(ARYLETHER KETONE)WITH BISPHENOL-A MOIETY 被引量:1
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作者 Kai-jun Li Xiao-ting Chen Hao Sun Xu-dong Tang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2007年第6期651-655,共5页
A phosphrous-containing poly(aryl ether ketone) was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide (FPPPO) by nucleophilic substitution reaction. The structure of... A phosphrous-containing poly(aryl ether ketone) was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide (FPPPO) by nucleophilic substitution reaction. The structure of the polymer was characterized by FT-IR, ^1H-NMR and ^31p-NMR. The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature (Tg) of the polymer was 205℃, and the 5% weight loss temperature under nitrogen was 475℃. Good solubility of the polymer in organic solvents, such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide, dimethylsulfoxide and chloroalkanes was observed, flexible film was obtained from the polymer's CH2Cl2 solution. The limiting oxygen index (LOI) of the PAEK was 40, which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer. 展开更多
关键词 poly(aryl ether ketone) Bis[4-(4-fluorobenzoyl)phenyl] phenyl phosphine oxide (FPPPO) Nucleophilic substitution reaction Bisphenol-A.
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Effect of Chemical Doping and Ion Implantation on Cond uctivity of Poly(p-phenylene vinylene) Derivatives 被引量:1
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作者 LI Bao-ming WU Hong-cai LIU Xiao-zeng LI Xiao-qi GAO Chao 《Semiconductor Photonics and Technology》 CAS 2005年第3期188-191,共4页
The surface conductivity of poly [ 2-methoxy-5-(3'-methyl) butoxy]-p-phenylene vinylene (PMOMBOPV) films doped with FeCl3 and H2SO4 by chemical method and implanted by N^+ ions was studied and the comparison of ... The surface conductivity of poly [ 2-methoxy-5-(3'-methyl) butoxy]-p-phenylene vinylene (PMOMBOPV) films doped with FeCl3 and H2SO4 by chemical method and implanted by N^+ ions was studied and the comparison of environmental stability of conductive behavior was also investigated. The energy and dose of N^+ ions were in the rang 15~35 keV and 3. 8×10^15~9. 6×10^16 ions/cm^2, respectively. The conductivity of PMOMBOPV film was enhanced remarkably with the increases of the energy and dose of N^+ ions. For example, the conductivity of PMOMBOPV film was 3. 2×10^-2S/cm when ion implantation was performed with an energy of 35 keV at a dose of 9. 6 × 10^14 ions/cm^2 , which was almost seven orders of magnitude higher than that of film unimplanted. The environmental stability of conductive behavior for ionimplanted film was much better than that of chemical doped films. Moreover, the conductive activation energy of ion-implanted films was measured to be about 0.17 eV. 展开更多
关键词 Ion implantation Chemical doping poly[2-methoxy-5-(3'-methyl)butoxy]-p-phenylene vinylene Surface conductivity Conductive activation energy
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XPS STUDIES ON SURFACE MODIFIED POLY [1-(TRIMETHYLSILYL)-1-PROPYNE] MEMBRANES Ⅱ SURFACE MODIFICATION BY BROMINE VAPOR
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作者 许观藩 孙晓光 +2 位作者 邱雪鹏 张金兰 郑国栋 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1994年第2期180-184,共5页
Surface modification of poly [1-(trimethylsilyl)-1-propyne] (PTMSP) membranes bybromine vapor has been studied. It is shown that Br/C atomic ratio at the surfaces increased withthe time of bromination until about 60 m... Surface modification of poly [1-(trimethylsilyl)-1-propyne] (PTMSP) membranes bybromine vapor has been studied. It is shown that Br/C atomic ratio at the surfaces increased withthe time of bromination until about 60 min, then it reached a plateau. The results of XPS and IRstudies indicated that the addition of bromine to double bonds and the replacement of H on CH_3 bybromine had taken place so that a new peak at 286.0 eV (C--Br)in C_(1s) spectra and some newbands, e. g. at 1220 and 580cm^(-1) in IR spectra were formed. The fact,t Po_2, permeability ofoxygen, decreased and α_(O_2/N_2), separation factor of oxygen relative to nitrogen, increased withbromination time, shows that surface modification of PTMSP by bromine may be an efficient approach to prepare PTMSP membranes used for practical gas separations. 展开更多
关键词 Membrane poly [1-(trimethylsilyl)-1-propyne] Bromination 3 Surface modification XPS
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Self-aggregating behavior of poly(4-vinyl pyridine)and the potential in mitigating sand production based onπ-πstacking interaction
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作者 Jian-Da Li Gui-Cai Zhang +4 位作者 Ji-Jiang Ge Wen-Li Qiao Hong Li Ping Jiang Hai-Hua Pei 《Petroleum Science》 SCIE CAS CSCD 2022年第5期2165-2174,共10页
Unconsolidated sandstone reservoirs are most susceptible to sand production that leads to a dramatic oil production decline.In this study,the poly(4-vinyl pyridine)(P_(4)VP)incorporated with self-aggregating behavior ... Unconsolidated sandstone reservoirs are most susceptible to sand production that leads to a dramatic oil production decline.In this study,the poly(4-vinyl pyridine)(P_(4)VP)incorporated with self-aggregating behavior was proposed for sand migration control.The P_(4)VP could aggregate sand grains spontaneously throughπ-πstacking interactions to withstand the drag forces sufficiently.The influential factors on the self-aggregating behavior of the P_(4)VP were evaluated by adhesion force test.The adsorption as well as desorption behavior of P_(4)VP on sand grains was characterized by scanning electron microscopy and adhesion force test at different pH conditions.The result indicated that the pH altered the forms of surface silanol groups on sand grains,which in turn affected the adsorption process of P_(4)VP.The spontaneous dimerization of P_(4)VP molecules resulting from theπ-πstacking interaction was demonstrated by reduced density gradient analysis,which contributed to the self-aggregating behavior and the thermally reversible characteristic of the P_(4)VP.Dynamic sand stabilization test revealed that the P_(4)VP showed wide pH and temperature ranges of application.The production of sands can be mitigated effectively at 20-130℃ within the pH range of 4-8. 展开更多
关键词 Self-aggregating poly(4-vinyl pyridine) π-πstacking Sand migration control
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STUDIES ON THE REGULAR COPOLYMERS OF POLY (1, 4-PHENYLENETEREPHTHALAMIDE)
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作者 宝净生 王兵 徐朝俦 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1991年第1期48-54,共7页
Two types of the regular copolymer of poly (1, 4-phenyleneterephthalamide) were synthesized by the low temperature solution polycondensation in NMP-CaCl_2 solvent system, using the piperazine or 2,5-dimethylpiperazine... Two types of the regular copolymer of poly (1, 4-phenyleneterephthalamide) were synthesized by the low temperature solution polycondensation in NMP-CaCl_2 solvent system, using the piperazine or 2,5-dimethylpiperazine as the third components introduced in the main chain of poly (1, 4-phenyleneterephthalamide). The properties of copolymers were characterized by IR, SEM, X-RAY diffraction, polarizing microscopy, TGA and solubilities.Experimental results showed that the copolymers had good solubility and thermal stability, the concentrated sulfuric acid (~98% ) solution of regular PPTA copolymers had liquid crystalline proper- 展开更多
关键词 poly ( 1 4- phenyleneterephthalamide ) Aromatic copolyamide PIPERAZINE 2 5-Dimethylpiperazine liquid crystalline polymer
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Preparation of High Molecular Weight Poly(L-lactide-co-caprolactone)(85-15)
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作者 湛雪辉 申雄军 +2 位作者 LI Zhaohui LI Xia CAO Fen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第1期139-143,共5页
Poly(L-lactide-co-caprolactone)(85-15)[P(LLA-CL)(85-15)] was synthesized from high purity L-lactide and e-caprolactone using tin octoate as initiator by ring-opening polymerization, and characterized by infrar... Poly(L-lactide-co-caprolactone)(85-15)[P(LLA-CL)(85-15)] was synthesized from high purity L-lactide and e-caprolactone using tin octoate as initiator by ring-opening polymerization, and characterized by infrared spectrum and IH-NMR spectrum. The synthesized P(LLA-CL)(85-15) is a random copolymer. The influences of polymerization temperature, polymerization time, dosage of initiator and polymerization pressure on the weight average molecular weight and the polydispersity index of P(LLA-CL)(85-15) were investigated. The optimum preparation conditions of P(LLA-CL)(85-15) are: the polymerization pressure is less than 0.5 Pa, the polymerization temperature is 130 ~C, the n(M)/n(I) ratio is 8 000/1, and the polymerization time is 36 h. Under the condition, the weight-average molecular weight of prepared P(LLA-CL)(85-15) is 65.6x 104, and molecular weight distribution coefficient is 1.15. 展开更多
关键词 poly(L-lactide-co-caprolactone)(85-15) COpolyMERIZATION high molecular weight characterization
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Rapid Expansion of Supercritical Solution of Poly (1,1,2,2- Tetrahy-droperfluorodecyl Acrylate)
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作者 董擎之 《Journal of China Textile University(English Edition)》 EI CAS 1999年第2期35-37,共3页
Poly(1,1,2,2- tetrahydroperfluorodecyl acrylate) (poly (TA-N)) was synthesized in laboratory. The resulting morphology of rapid expansion of supercritical solution (RESS) sprays of poly(TA - N) was investigated. At ap... Poly(1,1,2,2- tetrahydroperfluorodecyl acrylate) (poly (TA-N)) was synthesized in laboratory. The resulting morphology of rapid expansion of supercritical solution (RESS) sprays of poly(TA - N) was investigated. At apre - expansion temperature of 45℃), amorphous polymer was formed. At temperature around 60 ℃ to 80 ℃ , fibers were formed. Increase of temperature increasesparticle size slightly. At temperature of 105℃ , most of particles are spheres. The RESS is an attractive process. To apply the polymers desired for coating applications in an organic solvent - free process that is economically viable , and it will have implications for pollution prevention during polymer film 展开更多
关键词 Rapid EXPANSION of SUPERCRITICAL solution ( RESS ) poly( 1 1 2 2 - tetrahydroperfluorodecyl ACRYLATE ) Synthesis POROUS sintered metal plate .
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Poly{[4-(hydroxyl)(tosyloxyl)iodo]styrene} Promoted Halotosyloxylation Reaction of Alkynes
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作者 Jiang Min CHEN Xiang Jin LIN +1 位作者 Lu Ling WU Xian HUANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第3期315-316,共2页
Halotosyloxylation reaction of alkynes with iodine or NBS or NCS was efficiently promoted by the poly{[4-(hydroxyl)(tosoyloxyl)iodo]styrene}.
关键词 poly{[4-(hydroxyl)(tosoyloxyl)iodo]styrene} halotosyloxylation reaction alkynes.
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IONIC CONDUCTIVITY OF POLY (β-ALKOXYCARBONYLETHYLMETHYLSILOXANE)-LiClO_4 CROSSLINKED FILMS
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作者 李永军 吴留仁 +1 位作者 方世璧 江英彦 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1990年第2期127-132,共6页
Poly (β-carboxyethylmethylsiloxane)-LiClO_4 and poly (β-alkoxylethylmethylsiloxane)-LiClO_4 crosslinked fllms have been prepared. The ionic conductivity of the films depends on the polymer species, concentration of ... Poly (β-carboxyethylmethylsiloxane)-LiClO_4 and poly (β-alkoxylethylmethylsiloxane)-LiClO_4 crosslinked fllms have been prepared. The ionic conductivity of the films depends on the polymer species, concentration of lithium perchlorate, temperature and content of crosslinking agent. The effect of high polar organic solvent 1, 4-butyrolactone on the ionic conductivity and mechanical properties of poly (β-carhoxyethylmethylsiloxane )-LiClO_4 system was also investignied. 展开更多
关键词 Ionic conductivity: poly-alkoxycarbonylethylmethylsiloxane)- Lithium Complex 1 4-butyrolactone Crosslinked film.
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Chinese Journal of Polymer Science VOLUME 13 No.1-4 1995
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《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1995年第4期385-389,共5页
关键词 Chinese Journal of polymer Science VOLUME 13 No.1-4 1995 poly
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SYNTHESIS,CHARACTERIZATION AND ANTIMICROBIAL PROPERTIES OF 4-[(4-HYDROXYBENZYLIDENE)AMINO]PHENOL AND ITS POLYMER
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作者 Ismet Kaya Suleyman Culhaoglu Dilek Senol 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2007年第5期461-472,共12页
The oxidative polycondensation reaction conditions of 4-[(4-hydroxybenzylidene) amino] phenol (4-HBAP) were studied with H2O2, air oxygen and NaOCl in an aqueous alkaline medium between 50 and 90℃. The structures... The oxidative polycondensation reaction conditions of 4-[(4-hydroxybenzylidene) amino] phenol (4-HBAP) were studied with H2O2, air oxygen and NaOCl in an aqueous alkaline medium between 50 and 90℃. The structures of the obtained monomer and polymer were confirmed by FT-IR, UV-Vis, 1H- and 13C-NMR and elemental analysis. The characterization was made by TG-DTA, size exclusion chromatography (SEC) and solubility tests. At the optimum reaction conditions, the yield of poly[4-(4-hydroxybenzylidene amino) phenol] (P-4-HBAP) was found to be 48.3% (for H2O2 oxidant), 80.5% (for air O2 oxidant) and 86.4% (for NaOCl oxidant). According to the SEC analysis, the number-average molecular weight (Mn), weight-average molecular weight (Mw) and polydispersity index (PDI) values of P-4-HBAP was found to be 8950, 10970 g tool^-1 and 1.225, respectively, using H202; and l l610, 15190 g tool^-1 and 1.308 respectively, using air 02 and 7900, 9610 g mol^-1 and 1.216, respectively, using NaOC1. According to TG-DTA analyses, P-4-HBAP was more stable than 4-HBAP against thermal decomposition. The weight loss of P-4-HBAP was found to be 49.27% at 1000℃. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) values calculated from electrochemical measurement. Electrochemical energy gaps (Eg') of 4-HBAP and P-4-HBAP were found to be -5.46, -5.28; -2.26, -2.67; 3.20 and 2.61 eV, respectively. According to UV-Vis measurements, optical band gap (Eg) of 4-HBAP and P-4-HBAP were found to be 3.34 and 3.01 eV, respectively. Also, antimicrobial activities of 4-HBAP and P-4-HBAP were examined against selected some bacteria. The electrical conductivity of the polymer was measured after doping with iodine. 展开更多
关键词 Air oxygen H2O2 NAOCL poly[4-(4-hydroxybenzylidene amino) phenol] Oxidative polycondensation Thermal analysis CONDUCTIVITY Antimicrobial and bad gap.
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Chinese Journal of Polymer Science Volume 27,No.1-6,2009 CONTENTS
19
《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2009年第6期909-918,共10页
关键词 Chinese Journal of polymer Science Volume 27 No.1-6 2009 CONTENTS poly
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Chinese Journal of Polymer Science Volume 26,No.1-6,2008 CONTENTS
20
《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2008年第6期802-809,共8页
关键词 Chinese Journal of polymer Science Volume 26 No.1-6 2008 CONTENTS poly
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