六甲基环三硅氧烷的DMF/n-BuLi阴离子聚合体系的反应动力学

Kinetics of Anionic Polymerization of Hexamethylcyclotrisiloxane in the System of DMF/n-BuLi

研究了用膨胀计法在促进剂N,N-二甲基甲酰胺(DMF)存在下以正丁基锂为引发剂的六甲基环三硅氧烷的阴离子均聚反应动力学,结果表明:六甲基环三硅氧烷的反应速率随着反应温度的升高及DMF用量的增加而提高。并通过阿仑尼乌斯方程求得不同反应条件下的聚合活化能和表观反应速率常数。

The kinetics of anionic homopolymerization of hexamethylcyclotrisiloxane was studied systematically with N,N-dimethyllformamide (DMF) as promoter and n-BuLi (n-butyllithium) as initiator. It was found that the homopolymerization velocity of hexamethylcyclotrisioxane increased with the increasing of reaction temperature and DMF/n-BuLi. The activation energy and the frequency factor of the reaction were calculated by Arrhenius formula.