负离子聚合法合成丁二烯-异戊二烯无规共聚物的序列结构  

Sequence structure of butadiene-isoprene random copolymer synthesized by anionic polymerization

作　　者：王敬[1] 鲁建民[1] 韩丙勇[1] 张立群[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《合成橡胶工业》2013年第3期198-203,共6页China Synthetic Rubber Industry

基　　金：国家自然科学基金资助项目(50973004;20934001)

摘　　要：以正丁基锂(n-BuLi)为引发剂、十二烷基苯磺酸钠(SDBS)为调节剂,在环己烷中对丁二烯(Bd)和异戊二烯(Ip)进行负离子聚合制得Bd-Ip共聚物,考察了反应温度、单体配比及调节体系对Ip共聚活性及共聚物序列分布的影响。结果表明,提高反应温度或增加Ip单体含量、SDBS/n-BuLi(摩尔比)由0/1.0增大到0.5/1.0,均可提高Ip共聚活性;共聚物序列分布服从一级Markov统计模型,在70℃、Ip/Bd(质量比)5/5、SDBS/n-BuLi(摩尔比)0.5/1.0、单体质量浓度0.12 g/mL的条件下,在共聚物中Ip、Bd 2种单元的同等长度单元组浓度趋于一致,所得共聚物的无规化程度高。Butadiene-isoprene （ Bd-Ip ） copolymer was synthesized with n-BuLi as initiator, sodium do-decylbenzene sulfonate （ SDBS ） as regulator, cyclohex-ane as nonpolar solvent by anionic polymerization. Effects of temperature, monomer ratio and regulators on copolymerization reactivity of Ip and sequence dis-tribution of the copolymer were investigated. The re-sults showed that the copolymerization reactivity of Ip was improved with increasing reaction temperature, mass ratio of Ip and mole ratio of SDBS/n-BuLi from 0/1.0 to O. 5/1. 0. The unit sequence distribution of eopolymer was in accord with the first-order Markov statistics, and the same length of Ip and Bd dyad dis-tribution approaehed, the random degree of Bd-Ip co-polymer was high at 70℃, Ip/Bd （ mass ratio） 5 ： 5, SDBS/n-BuLi（mole ratio）0. 5/1.0 and mass concen-tration of monomers 0. 12 g/mE.

关 键 词：丁二烯 异戊二烯 负离子聚合 无规化 序列分布 

分 类 号：O631.3[理学—高分子化学]