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合成橡胶工业 |
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合成橡胶工业 |
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3种星形苯乙烯-异戊二烯-丁二烯三元共聚物的结构与性能 冯华东 张兴英 摘 要：以多官能度锂(简称Li)为引发剂,在不同条件下合成了3种星形苯乙烯(St)-异戊二烯(Ip)-丁二烯(Bd)三元共聚物,分析了共聚物的结构.结果表明,两次投料法的产物为两嵌段共聚物,低R[四氢呋喃(THF)与Li的摩尔比]值合成的聚异戊二烯(PI)链段的玻璃化转变温度(Tg)为-58.3℃,1,4-结构为83.8%;高R值合成的无规共聚段的Tg为-36.2℃.低R值一次投料法产物为多嵌段共聚物,-69℃为Bd-Ip无规共聚段的Tg,1,4-结构含量高;22.7℃为Ip-St共聚段的Tg,含摩尔分数为6.6%的PS嵌段.高R值一次投料法的产物为三元无规共聚物,1,4-结构含量低,只有1个Tg,为-28.9℃. Structure and properties of three kinds of star-shaped styrene-isoprene-butadiene terpolymers
Feng Huadong（College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China）
Zhang Xingying（College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China）
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Living polymerization provides a lot of synthetic routes to obtain a wide variety of well-defined polymer structures. In general, star shaped polymers can be synthesized by two different ways: "arm-first"and "core-first". In the "core-first" way, the synthesis of star-shaped polymers can be performed directly in the presence of multifunctional initiators. In this paper, on the basis of a patent technology of multilithium initiator with Sn-C bonds, three new kinds of star-shaped styrene(St) -isoprene(Ip) -butadiene (Bd) terpolymers ( sample 1,2,3 )were synthesized by anionic polymerization respectively. All of them have lower number of "free end" than the star-shaped copolymers coupled by Sn-C bonds through "arm-first" way.…… |
| 基金项目：Supported by National Science Foundation of China(50573005). 作者简介：Feng Huadong, doctoral student. 作者单位：冯华东（北京化工大学,材料科学与工程学院,北京,100029） 张兴英（北京化工大学,材料科学与工程学院,北京,100029） |
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收稿日期：2007年4月7日 出版日期：2007年11月15日 |
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