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分别以双甲基丙烯酸二缩三乙二醇酯和二乙烯苯为支化单体合成支化聚苯乙烯.用GC、1H-NMR和三检测体积排除色谱(TD-SEC)对聚合反应过程、支化发展和聚合物的支化结构进行了详细的分析表征.两个聚合反应体系内单体转化速率几乎一样,相同单体转化率下,初级链的分子量近似相等.但是由于双甲基丙烯酸二缩三乙二醇酯与苯乙烯单体之间存在给体-受体(donor-acceptor)相互作用,双甲基丙烯酸二缩三乙二醇酯的转化速率比二乙烯苯的要快得多,其结果是该反应体系表现出更快的支化发展速度,在相同单体转化率下显示出更高的支化分子含量,但支化单体结构的不同并未对支化分子的支化结构形态产生明显的影响.
Branched polystyrene was synthesized by the reaction of triethylene glycol dimethacrylate and divinylbenzene, respectively. The effects of polymerization conditions on the polymerization process were analyzed by GC, 1H-NMR and three-detection volume exclusion chromatography (TD-SEC) , Branching development and branching structure of the polymer were analyzed and characterized in detail.The conversion rates of monomers in the two polymerization systems were almost the same.The molecular weights of the primary chains were approximately the same under the same monomer conversion.But due to the differences There is a donor-acceptor interaction between triethylene glycol acrylate and styrene monomer, and the conversion rate of triethylene glycol dimethacrylate is faster than that of divinylbenzene As a result, the reaction system showed a faster rate of branching and exhibited higher branching content at the same monomer conversion, but the difference in the structure of the branching monomer did not affect branching The branching structure morphology has a significant impact.