摘要
采用溶液聚合法在己烷溶剂中以新癸酸钕(简称Nd)/三异丁基铝(简称Al)/氯化二乙基铝(简称Cl)催化体系合成丁二烯-异戊二烯共聚物,研究催化剂制备过程中陈化方式、陈化时间、陈化温度、异戊二烯单体加入量和催化剂组分配比对丁二烯与异戊二烯共聚合的影响。结果表明:采用Nd/Al/Cl催化体系可以合成高顺式丁戊无规共聚物,催化剂制备条件对共聚物微观结构的影响不大,聚丁二烯和聚异戊二烯链节中的顺式1,4-结构摩尔分数均大于0.96;在催化剂制备过程中加入少量异戊二烯单体,可提高催化剂的聚合活性;共聚物具有高数均相对分子质量(38.8×104~42.1×104);当Al/Nd摩尔比为15、Cl/Nd摩尔比为1.5时,丁戊共聚物的收率较大,相对分子质量分布最窄。
Copolymerization of butadiene and isoprene in hexane by solution polymerization was studied with Nd（vers）3-Al（i-Bu）3-Al（i-Bu）2 Cl（called Nd/Al/Cl） catalytic system. The effects of catalyst preparation conditions such as aging method,aging time,aging temperature,isoprene monomer amount and catalyst components mole ratio on the copolymerization of butadiene and isoprene were investigated. The results showed that,butadiene-isoprene random copolymer with high cis-content could be synthesized by Nd/Al/Cl catalytic system,and the catalyst preparation conditions had little effect on the microstructure of butadiene-isoprene copolymers. The mole ratio of cis-1,4-structure in polybutadiene and polyisoprene chains were all above 0. 96. The addition of a small amount of isoprene monomer in the preparation of catalyst could improve the polymerization activity of the catalyst. The butadiene-isoprene copolymers had high number-average molecular weight（38. 8×10^4- 42. 1×10^4）. When the mole ratio of Al/Nd was 15 and that of Cl/Nd was 1. 5,the yield of butadiene-isoprene copolymer was large,and the molecular weight distribution was the narrowest.
作者
牛忠福
郎秀瑞
姜波
NIU Zhongfu;LANG Xiurui;JIANG Bo(Qingdao University of Science and Technology,Qingdao 266042,China;Qingdao Ruilin Material Technology Co.,Ltd,Qingdao 266000 China)
出处
《橡胶工业》
CAS
2018年第10期1113-1119,共7页
China Rubber Industry
基金
国家国际科技合作专项(2013DFR50240)
