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    題名: 鹼催化醇解矽橡膠模式物的反應動力模式
    其他題名: A Kinetic Model for Base-Catalyzed Ethanolysis of Model Compound of Silicone Rubber
    作者: 林裕凱;張誌民;張正良
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: 醇解;鹼觸媒;模式物;矽橡膠;Ethanolysis;Base catalyst;Model compound;Silicone rubber
    日期: 2004-02
    上傳時間: 2014-02-09 00:42:38 (UTC+8)
    摘要: 本研究為了模擬室溫硬化型矽橡膠交聯點在鹼催化下行親核性裂解的反應行為,因此以四-(三甲基矽烷氧基)矽烷tetrakis(trimethylsiloxy)-silane作為室溫硬化型矽橡膠之模式物,探討醇解矽氧鍵結時鹼觸媒濃度、裂解劑濃度及溫度對反應速率的影響,並建立反應速率式,估算反應參數及活化能。模式物在鹼性觸媒下醇解反應結果顯示:1.裂解劑乙醇與鹼觸媒濃度愈高裂解速率愈快。2.模式物濃度隨反應時間逐漸減少,而反應時間較長時模式物濃度消耗速率趨於平緩,達到平衡。3.裂解產物有再聚合成高分子產物的現象。4.昇溫會增快反應的進行。本研究假設一反應機構來推導反應速率式,並使用擬線性法,配合最小平方誤差法估算不同溫度下醇解反應之反應參數及活化能。結果顯示反應速率常數在5,30,40及50℃下分別為0.0028,0.0053,0.0075及0.0097 min-1M-2,其活化能為19.244 kJ/mol。
    Base catalysts enhanced ethanolysis reaction of room temperature vulcanized polydimethylsiloxane network was studied with the aid of a model compound. Tetrakis-(trimethylsiloxy)-silane (M4Q). Experimental results showed that the rate of disappearance of M4Q decreased with increasing concentration of base catalyst and ethanol. The reaction rate was increased by increasing the reaction temperature. Products of high molecular weight were also found as the reaction proceeded. The mechanism and rate law of the ethanolysis reaction were proposed. A quasilinearization method was employed to determine the best set of the kinetic parameters of ethanolysis. The reaction constants of ethanolysis reaction at temperatures of 5, 30, 40 and 50 degree C are 0.0028, 0.0053, 0.0075 and 0.0097 min-1M-2, respectively. The activation energy is 19.244 kJ/mol.
    關聯: 2004高分子聯合會議:第二十七屆高分子研討會&九十三年高分子學會年會&九十三年國科會高分子學門研究成果發表會論文集,4頁
    顯示於類別:[化學工程與材料工程學系暨研究所] 會議論文

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