SBS／聚（苯乙烯－甲基丙烯酸盐）热塑性互穿聚合物网络的研究──I．母体的合成、组成分析和反应动力学

The studies of thermoplastic IPN Based on SBS and Styrene-Methacrylate Ionomer -I. Synthsis,quantitative analysis and kinetic studies on formation of IPN precursor

采用化学共混法合成了以三嵌段共聚物ＳＢＳ为聚合物Ｉ，无规共聚物苯乙烯－甲基丙烯酸（少量）为聚合物Ⅱ的热塑性ＩＰＮ母体，并使用化学方法对其组成进行了分析．研究了在ＳＢＳ存在下苯乙烯－甲基丙烯酸的共聚动力学行为，考察了ＳＢＳ含量、引发剂浓度以及反应温度对单体转化率的影响，求出了在预溶胀ＳＢＳ的本体聚合体系中苯乙烯－甲基丙烯酸的表现竞聚率，并对其共聚反应规律进行了探讨．

In this poper,Thermoplastic interpenettating polymer network precursors were synthesised by swelling a linear styrene - butadiene-styrene (SBS ) triblcok copolymer with styrene and methacrylic acid monomer. Carboxyl content was analysized by potassium methoxide titration in benzene / methanol (10 / 1, v / v ) solution. Unsaturation was determined by means of iodine monochloride. The influences of SBS content,initiator concentration and reaction temperature on the kinetics were examined. The reactivity ratios for Styrene and methacrylic acid in the bulk polymergation have been obtained. The values of them are 0. 16and 0. 47,respectively. We also examined the variations of instantaneous copolymer composition with conversion.