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合成橡胶工业 |
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合成橡胶工业 |
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用含有麝香草酚钡的负离子催化剂体系合成高反式嵌段聚丁二烯 曾凡君 张春庆 李杨 张雪涛 王玉荣 摘 要：以环己烷为溶剂,正丁基锂(简称Li)为主引发剂,加入有麝香草酚钡(简称Ba)和三异丁基铝(简称Al)形成的复合引发剂体系,合成了中反-高反的嵌段聚丁二烯(PB).通过改变Ba和Al的加入时间合成了不同结构的嵌段中反-高反PB.研究了不同引发剂添加量对嵌段中反-高反结构与玻璃化转变温度(Tg)的影响.结果表明,均聚物高反式PB只有1个Tg,为-86.9℃,而嵌段PB则有2个Tg,分别为-92.7℃和-32.7℃;随着高反式嵌段含量的减少,PB总的反式结构含量降低,但高反式嵌段的反式结构含量基本保持不变. High trans-block polybutadiene synthesized with anionic catalyst system including barium thymol
Zeng Fanjun（College of Chemical Engineering, Dalian University of Technology, Dalian 116012, China）
Zhang Chunqing（College of Chemical Engineering, Dalian University of Technology, Dalian 116012, China）
Li Yang（College of Chemical Engineering, Dalian University of Technology, Dalian 116012, China）
Zhang Xuetao（College of Chemical Engineering, Dalian University of Technology, Dalian 116012, China）
Wang Yurong（College of Chemical Engineering, Dalian University of Technology, Dalian 116012, China）
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Barium thymol(Ba) -Al(i-Bu)3 (Al) -n-BuLi(Li) complex catalyst system for synthesizing high trans-1,4-polybutadiene(HTPB) was studied. In the catalyst system, Al and Ba were used as assistant initiator for adjusting trans-1,4-sturue-ture content of polybutadiene (PB). PB having different trans-structure content could be obtained by changing values of Ba∶ Al∶ Li(mole ratio) as showed in Table 1. Choose a suitable value of Ba∶Al∶Li and synthesize PB having high trans-block as follows. A 100 mL stainless reactor dried and purged with nitrogen was charged with cyclohexane solution of 1,3-butadiene. Then, solution of Li in hexane was added to the reactor. The polymerization was carried out at 50 ℃ for a certain time. And then added solution of Ba in ethyl benzene,solution of Al in cyclohexane into the reactor. The polymerization was carried out at 70 ℃ for 4 h. By this method,block medium trans-high trans-PB could be obtained.…… |
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收稿日期：2007年4月25日 出版日期：2007年11月15日 |
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