丁二烯、苯乙烯溶液共聚体系的偶联反应

Coupling reaction of butadiene-styrene solution copolymerization system in presence of higher mole ratio of THF/n-BuLi

以ｎ－ＢｕＬｉ为引发剂，ＴＨＦ／ｎ－ＢｕＬｉ（摩尔比）为８０～３００，在丁二烯、苯乙烯负离子共聚体系中加入ＳｎＣｌ４或己二酸二乙酯（ＤＥＡＰ）进行偶联反应，研究了ＴＨＦ和偶联剂用量、偶联反应温度和时间及共聚物不同链末端结构对偶联反应的影响。结果表明，ＳｎＣｌ４的偶联效率（５１．６％）高于ＤＥＡＰ（４３．８％），且该体系共聚物链末端结构对偶联效率无影响；ＳｎＣｌ４较佳的偶联反应条件为：５０℃，３０ｍｉｎ，ＳｎＣｌ４／ｎ－ＢｕＬｉ为０．

The coupling reaction of butadiene-styrene anionic copolymerization system was studied in the presence of higher mole ratio of THF/n-BuLi(80～300) with n-BuLi as initiator,SnCl4 or diethyl adipate(DEAP) as coupling agent.The effects of THF/n-BuLi content,coupling agent amount,coupling reaction temperature and time,and different end structure of copolymer on the coupling reaction were investigated. It was found that the coupling efficiency of SnCl4 (51.6%) was higher than DEAP (43.8%),and the coupling efficiency effect of different end structure of copolymer was not obvious. The better conditions of SnCl4 coupling reaction were 50 ℃,30 min and SnCl4/n-BuLi 0.13.