摘要
研究了在 2 0~ 50℃下 ,以环己烷为溶剂、n -BuLi为引发剂、二氧六环 (DOX)为极性添加剂的异戊二烯阴离子聚合产物的微观结构。试验表明 :聚异戊二烯的 3,4 -结构含量随温度升高而减小 ,在同一温度下 ,随二氧六环用量增加而增大 ;当R =[DOX]/[n -BuLi]=50时 ,出现 1 ,2 -结构 ,温度越高 ,出现 1 ,2 -结构时的R值越大 ,且1 ,2 -结构含量随R增大而增加。另外 ,还求出了该聚合体系的综合活化能、综合平衡常数K′、络合指数n′及 1 ,2 -结构、3,4 -结构含量与温度的关系式。
The anionic polymerization of isoprene at 20~50 ℃ using cyclohexane as solvent,dioxane(DOX) as polar additive and n-BuLi as initiator was carried out and the microstructure of its product was investigated.The results show that the 3,4-structure contents in polyisoprene decrease with increase in temperature,and increase with increase in DOX amount at the same temperature.The 1,2-structure will appear when R equals 50,and the 1,2-structure contents increase with increase in DOX amount.The relationships of comprehensive equilibrium constant K′ and the coordination solvated index n′ vs temperature,the amount of complex activation energy are obtained.
出处
《石油化工》
CAS
CSCD
北大核心
2000年第11期845-848,共4页
Petrochemical Technology
基金
中国石油化工集团公司技术开发中心资助