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考察了间甲基苯酚钾(m-ROK)用量对正丁基锂(n-BuLi)/m-ROK/二乙二醇二甲醚/异戊二烯/二甲苯负离子聚合体系的链转移反应、聚异戊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,聚异戊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异戊二烯的相对分子质量分布。增加m-ROK用量时,聚异戊二烯微观结构中1,2-结构和3,4-结构质量分数下降,1,4-结构质量分数增加。
The effect of the amount of m-methylphenol (m-ROK) on the n-BuLi / m-ROK / diethylene glycol dimethyl ether / isoprene / xylene anion polymerization system was investigated. , Polyisoprene relative molecular weight and microstructure. The results showed that the intrinsic viscosity and relative molecular mass of polyisoprene decreased rapidly and the number of chain transfer increased when m-ROK / n-BuLi (molar ratio) was less than 0.5. When m-ROK / n-BuLi Than) is greater than 0.5, then do not follow this change. The addition of m-ROK significantly widened the relative molecular mass distribution of polyisoprene. When the amount of m-ROK was increased, the mass fraction of 1,2-structure and 3,4-structure of polyisoprene decreased and the mass fraction of 1,4-structure increased.