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在正丁基锂(n-BuLi)/间甲基苯酚钾(m-ROK)/二乙二醇二甲醚/丁二烯/二甲苯的负离子聚合体系中,研究了m-ROK用量对链转移反应、聚丁二烯相对分子质量及微观结构的影响。结果表明,当m-ROK/n-BuLi(摩尔比)小于0.5时,聚丁二烯的特性黏数和相对分子质量迅速下降,链转移次数增加;当m-ROK/n-BuLi(摩尔比)大于0.5时,则不遵循此变化规律。m-ROK的加入明显加宽了聚丁二烯的相对分子质量分布。增加m-ROK用量时,聚丁二烯的微观结构中1,2-结构质量分数下降,顺式-1,4-结构和反式-1,4-结构质量分数增加。
In the negative ion polymerization system of n-BuLi / m-ROK / diethylene glycol dimethyl ether / butadiene / xylene, the effect of m-ROK dosage on the chain Transfer reaction, relative molecular weight of polybutadiene and microstructure. The results showed that the intrinsic viscosity and relative molecular mass of polybutadiene decreased rapidly and the number of chain transfer increased when m-ROK / n-BuLi (molar ratio) was less than 0.5. ) Is greater than 0.5, then do not follow this change. The addition of m-ROK significantly broadened the relative molecular mass distribution of polybutadiene. When the amount of m-ROK was increased, the mass fraction of 1,2-structure in polybutadiene decreased, while the mass fraction of cis-1,4-structure and trans-1,4-structure increased.