以亚磷酸二乙酯为第三组分的铁系催化体系催化异戊二烯聚合  

Polymerization of isoprene using an iron-based catalyst with diethyl phosphite as third component

作　　者：胡雁鸣[1] 董为民[1] 姜连升[1] 张学全[1] 

机构地区：[1]中国科学院长春应用化学研究所,吉林长春130022

出　　处：《合成橡胶工业》2004年第6期344-347,共4页China Synthetic Rubber Industry

摘　　要：以乙酰丙酮铁 (简称Fe) /三异丁基铝 (简称Al) /亚磷酸二烷基酯 (简称DP)为催化体系 ,对异戊二烯进行聚合 ,考察了不同DP(烷基为甲基、乙基、正丁基或异辛基 )、催化剂组成及反应条件对聚合的影响。结果表明 ,以亚磷酸二乙酯 (DEP)为第三组分的催化体系 ,在己烷中于相对较高温度 (5 0℃ )下的催化活性最高。催化剂最佳配比为Al/Fe(摩尔比 ) 1 5 ,DEP/Fe(摩尔比 ) 2 0。所得聚异戊二烯橡胶的 3 ,4-结构(含 1 ,2 -结构 )摩尔分数约为 60 % ,微观结构基本不受反应条件的影响。The polymerization of isoprene with iron acetylacetonate(Fe)/triisobutylaluminum(Al)/dialkyl phosphite(DP) catalyst was examined with respect to the effects of different dialkyl phosphites (methyl,ethyl,n-butyl and iso-octyl),the ratios of the catalyst components,polymerization temperature and time. The results showed that the catalyst combined with diethyl phosphite(DEP) exhibited the highest activity in isoprene polymerization in hexane at relatively high temperature (50 ℃). The optimum polymer yield achieved at Al/Fe 15(mole ratio ) and DEP/Fe 2.0(mole ratio). The produced polyisoprene possessed mole fraction of 3,4-unit (including 1,2 -unit)60%,which was almost independent of the polymerization conditions.

关 键 词：异戊二烯 乙酰丙酮铁 亚磷酸二烷基酯 三异丁基铝 聚异戊二烯橡胶 微观结构 

分 类 号：O643.3[理学—物理化学]