稀土催化异戊二烯本体聚合动力学的研究  

BULK POLYMERIZATION KINETICS OF ISOPRENE WITH RARE EARTH CATALYST

作　　者：赵立群[1] 龚志 郭春玲[1] 王佛松[1] 

机构地区：[1]中国科学院长春应用化学研究所,沈阳化工学院130022

出　　处：《合成橡胶工业》1992年第5期263-265,共3页China Synthetic Rubber Industry

基　　金：国家自然科学基金

摘　　要：以Nd(naph)_3-Al(i-Bu)_3-Al_2Et_3Cl_3为催化剂,在-10～5℃下对异戊二烯(Ip)本体聚合的动力学进行了初步研究。发现单体转化率小于5％时,体系呈非稳态聚合;单体转化率大于50％时聚合受扩散控制;体系处于两者间则为稳态聚合。本体聚合的稳态聚合反应速率方程式为:R_p=K_p[Ln]^(196)M_0,计算出Ip本体聚合的表现活化能为69.9kJ/mol。The kinetics of the bulk polymerization of isoprene with Na(naph)3-Al(i-Bu)3-Al2Et3Cl3 catalyst system was studied in the temperature of -10 - 5° C . The results showed that there was a steady character in this system when the monomer conversion was in the range of 5% - 50% . The polymerization rate increased with increasing the initial content of the monomer in the steady period . The kinetic equation of the bulk polymerization rate of isoprene was obtained: Rp= 466 ×106[Ln]1.96M0 . Theapparent activation energy calculated was 69.9 kJ/mol which was more than that of the solution polymerization (37.7 kJ/mol). The conversion of polymerization and the catalyst level also influenced the molecular weight of the polymers.The results showed that the molecular weight of the polymer increased with increasing the conversion and decreasing the catalyst concentration .

关 键 词：异戊二烯 稀土 催化剂 本体聚合 

分 类 号：O632.14[理学—高分子化学]