期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
晶状聚酯多元醇和聚氨酯热熔胶粘剂
1
作者 王北海 《粘接》 CAS 2003年第1期48-48,共1页
关键词 晶状 聚酯多元 聚氨酯热熔胶粘剂 多元羧酸
下载PDF
卷材涂料
2
《涂料技术与文摘》 2002年第3期73-73,共1页
关键词 卷材涂料 多异氰酸 制备方法 防水卷材 中国发明专利 交联剂 单组分 IPC 脂族醇 德国专利
下载PDF
Synthesis of isosorbide-based polycarbonates via melt polycondensation catalyzed by quaternary ammonium ionic liquids 被引量:11
3
作者 Wei Sun Fei Xu +3 位作者 Weiguo Cheng Jian Sun Guoqing Ning Suojiang Zhang 《Chinese Journal of Catalysis》 EI CSCD 北大核心 2017年第5期908-917,共10页
A series of quaternary ammonium ionic liquids(ILs)were synthesized and employed as catalysts for the production of poly(isosorbide carbonate)(PIC)from diphenyl carbonate and isosorbide via a melt polycondensation proc... A series of quaternary ammonium ionic liquids(ILs)were synthesized and employed as catalysts for the production of poly(isosorbide carbonate)(PIC)from diphenyl carbonate and isosorbide via a melt polycondensation process.The relationship between the anions of the ILs and the catalytic activities was investigated,and the readily‐prepared IL tetraethylammonium imidazolate(TEAI)was found to exhibit the highest catalytic activity.After optimizing the reaction conditions,a PIC with a weight‐average molecular weight(Mw)of25600g/mol was obtained,in conjunction with an isosorbide conversion of92%.As a means of modifying the molecular flexibility and thermal properties of the PIC,poly(aliphatic diol‐co‐isosorbide carbonate)s(PAIC)s were successfully synthesized,again using TEAI,and polymers with Mw values ranging from29000to112000g/mol were obtained.13C NMR analyses determined that the PAIC specimens had random microstructures,while differential scanning calorimetry demonstrated that each of the PAICs were amorphous and had glass transition temperatures ranging from50to115°C.Thermogravimetric analyses found Td‐5%values ranging from316to332°C for these polymers.Based on these data,it is evident that the incorporation of linear or cyclohexane‐based diol repeating units changed the thermal properties of the PIC. 展开更多
关键词 Quaternary ammonium ionic liquid catalyst ISOSORBIDE POLYCARBONATE Melt polycondensation Aliphatic diol
下载PDF
Study on Structure and Crystallinity of A New Biodegradable Aliphatic-Aromatic Copolyester
4
作者 Wang Xiaohui Shi Jun +2 位作者 Chen Ying Fu Zhifeng Shi Yan 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2011年第4期64-69,共6页
A series of biodegradable aliphatic-aromatic copolyesters, poly(butylene terephthalate-co-butylene adipate-co- ethylene terephthalate-co-ethylene adipate) (PBATE), were synthesized from terephthalic acid (PTA), adipic... A series of biodegradable aliphatic-aromatic copolyesters, poly(butylene terephthalate-co-butylene adipate-co- ethylene terephthalate-co-ethylene adipate) (PBATE), were synthesized from terephthalic acid (PTA), adipic acid (AA), 1,4-butanediol (BG) and ethylene glycol (EG) through direct esterification and polycondensation. The sequence structure and crystallinity of the copolyester were investigated by 1H NMR spectroscopy and the wide-angle X-ray diffractometry (WAXD). The analytical results showed that the PBATE copolyester was a random copolymer and the composition of PBATE copolyester was almost consistent with the feed molar ratios. The crystal structure of PBATE copolyester belonged to the triclinic crystalline system; The variation in melting point of the synthesized PBATE copolyester agreed well with the estimation obtained by the Flory equation and was applicable to the random copolymer. 展开更多
关键词 biodegradable polyester sequence structure CRYSTALLINITY ALIPHATIC AROMATIC
下载PDF
A comparative study of the electrooxidation of C1 to C3 aliphatic alcohols on Ni modified graphite electrode
5
作者 JAFARIAN M. MIRZAPOOR A. +2 位作者 DANAEE I. SHAHNAZI Sangachin A.A. GOBAL F. 《Science China Chemistry》 SCIE EI CAS 2012年第9期1819-1824,共6页
Nickel modified graphite electrodes (G/Ni) prepared by galvanostatic deposition were examined for their redox process and electrocatalytic activities towards the oxidation of methanol, ethanol, 1-propanol and 2-prop... Nickel modified graphite electrodes (G/Ni) prepared by galvanostatic deposition were examined for their redox process and electrocatalytic activities towards the oxidation of methanol, ethanol, 1-propanol and 2-propanol in alkaline solutions. The methods of cyclic voltammetry (CV), ehronoamperometry (CA) and impedance spectroscopy (EIS) were employed. In CV studies, the electrochemical response, peak current varied in the order of MeOH 〉 EtOH 〉 1-PrOH 〉 2-PrOH. Under the CA regime, a higher catalytic rate constant obtained for methanol oxidation was in agreement with CV measurements. Lower charge transfer resistance was obtained for low carbon alcohols oxidation and significantly higher exchange current density was obtained for methanol oxidation. 展开更多
关键词 ALCOHOLS ELECTROCATALYTIC nickel modified electrode equivalent circuit
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部