Competition of aminolysis and alcoholysis in nucleophilic cleavage of a model compound for polysiloxane networks
學年 93
學期 1
出版（發表）日期 2005-01-01
作品名稱 Competition of aminolysis and alcoholysis in nucleophilic cleavage of a model compound for polysiloxane networks
作品名稱（其他語言）
著者 張正良; Chang, C. L.; Lin, Y. K
單位 淡江大學化學工程與材料工程學系
出版者 Elsevier
著錄名稱、卷期、頁數 Polymer Degradation and Stability 87(1), pp.207-211
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.
關鍵字 Aminolysis;Alcoholysis;Base catalyst;Model compound;Poly(dimethylsiloxane) network
語言 en
ISSN 0141-3910
期刊性質 國內
收錄於
產學合作
通訊作者
審稿制度 否
國別 TWN
公開徵稿
出版型式 ,電子版
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