异苯橡胶环化反应动力学研究及产物微细结构表征

THE KINETIC STUDIES ON CYCLIZATION OF STYRENE-ISOPRENE RUBBER

本文采用红外光谱法研究了前无报导的聚异苯橡胶环化反应动力学，测定了标题反应的动力学参数：反应级数ｎ＝１；活化能Ｅ＿ａ＝５３．２ｋＪ·ｍｏｌ￣（－１）；指前因子Ａ＝２．２４×１０￣６ｍｉｎ￣（－１），确立了该反应速率常数ｋ＿ｔ与ｓ反应温度Ｔ之间的函数关系为：Ｌｎ（ｋ＿Ｔ／ｍｉｎ￣（－１））＝１４．６２—６．４０×１０￣３Ｋ／Ｔ并采用核磁共振法分析了标题反应的产物环化异苯橡胶的微细结构，提出了标题反应的可能机理，并对活化能及指前因子进行了分析讨论。

The kinetics of the cyclization of styrene-isoprene rubber has been investigated by IRspectrum. Some kinetic parameters of this cyclization are determined.Reaction order n=1,apparent activation energy E_a=53.2 k_J·mol￣(-1),preexponential factor A=2.24×10￣6min￣(-1).The structure of cyclized styrene-isoprene rubber was analysed by ￣1H NMR experiments.The possible mechanisms of this cyclization have been suggested and discussed.