摘要
在丁二烯(Bd)负离子聚合中,当分别采用乙醚、二氧六环、四氢呋喃和二甲氧基乙烷作溶剂(或添加剂)时,根据文献数据和笔者的实验结果,分别求得了各体系溶剂极性的经验参数E_T与生成1,4-和1,2-结构的分活化能E_3和E_4、络合平衡常数K′、络合溶剂化指数n和溶剂化热△H之间的线性关系式。E_3=51.97-1.171E_T,E_4=51.20-1.201 E_T,△H=66.48-1.918E_T。用综合活化能(△H+E_π-E_σ)绝对值和n值的大小,可判断添加剂极性的强弱。
Et2O, DOX, THF and DME were used as solvent ( or additive) respectively in the anionic polymerization of butadiene . According to the literature data and author 's experiment,the linear relationships between the empirical parameter of solvent polarity ET and the partial activation energies E3 and E4 for forming 1,4-and 1,2-structure in polybutadiene , the coordinationconstant K', the solvent index n , and the solvation energy ΔH were obtained as follows: E3= 51.97-1.171ET.E4= 51.20-1.201 ET,ΔH= 66.48- 1.918ET.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
1993年第3期146-148,共3页
China Synthetic Rubber Industry
基金
中国石油化工总公司合成橡胶技术开发中心资助
关键词
丁二烯
聚合
溶剂
顺丁橡胶
butadiene
anionic polymerization
polybutadiene
activation energy
solvent polarity empirical parameter
