Competition of aminolysis and alcoholysis in nucleophilic cleavage of a model compound for polysiloxane networks

doi:10.1016/j.polymdegradstab.2004.07.022

淡江大學機構典藏 > 工學院 > 化學工程與材料工程學系暨研究所 > 期刊論文 > Item 987654321/44235

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题名:	Competition of aminolysis and alcoholysis in nucleophilic cleavage of a model compound for polysiloxane networks
作者:	張正良;Chang, C. L.;Lin, Y. K
贡献者:	淡江大學化學工程與材料工程學系
关键词:	Aminolysis;Alcoholysis;Base catalyst;Model compound;Poly(dimethylsiloxane) network
日期:	2005-01-01
上传时间:	2010-03-09 10:04:59 (UTC+8)
出版者:	Elsevier
摘要:	Base-catalysed aminolysis and ethanolysis of room temperature vulcanised poly(dimethylsiloxane) networks were studied with the aid of a model compound, tetrakis(trimethylsiloxy)-silane. Ethanol and ethylamine were used as nucleophilic reagents. The nucleophilicities of the reagents were enhanced by addition of potassium hydroxide. Kinetic models for the aminolysis and alcoholysis reactions at the initial stage were developed. The models reasonably predict the experimental data. Initial rate analysis was employed to determine the parameters of aminolysis and ethanolysis rate expressions. The overall activation energy of the aminolysis reaction is 14 kJ/mol. The initial rate of aminolysis was faster than that of ethanolysis. However, aminolysis reached equilibrium much faster than ethanolysis. When competition occurred in the reaction system, the aminolysis reaction dominates nucleophilic substitution at the initial stage and is followed by ethanolysis in a subsequent step.
關聯:	Polymer Degradation and Stability 87(1), pp.207-211
DOI:	10.1016/j.polymdegradstab.2004.07.022
显示于类别:	[化學工程與材料工程學系暨研究所] 期刊論文

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