Multigraft copolymer superelastomers: Synthesis morphology, and properties
Multigraft copolymer superelastomers: Synthesis morphology, and properties
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DOI：
10.1016/j.eurpolymj.2010.10.030
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发表时间：
2011-04
影响因子：
6
通讯作者：
David M Uhrig;Ralf Schlegel;R. Weidisch;J. Mays
中科院分区：
文献类型：
--
作者：
David M Uhrig;Ralf Schlegel;R. Weidisch;J. Mays
本文综述了以聚二烯为主链，聚苯乙烯为侧链的多元接枝共聚物的合成方法，重点介绍了分支点间距和分支点官能度的控制。活性阴离子聚合和氯硅烷连接化学的使用已经导致合成具有规则间隔的三官能（梳状）、四官能（蜈蚣）和六官能（双金属丝）分支点的一系列材料。通过透射电子显微镜和小角X射线散射表征了这些材料的形貌，发现这些材料的形貌受与每个分支点相关的局部结构不对称性控制。机械性能研究表明，这种多元接枝共聚物代表了一类新的热塑性弹性体（TPE），与常规TPE相比，其具有上级断裂伸长率和低残余应变。
The synthesis of well-defined multigraft copolymers having a polydiene backbone with polystyrene side chains is briefly reviewed, with particular focus on controlling branch point spacing and branch point functionality. Use of living anionic polymerization and chlorosilane linking chemistry has led to the synthesis of series of materials having regularly spaced trifunctional (comb), tetrafunctional (centipede), and hexafunctional (barbwire) branch points. The morphologies of these materials were characterized by transmission electron microscopy and small-angle X-ray scattering, and it was found that the morphologies were controlled by the local architectural asymmetry associated with each branch point. Mechanical properties studies revealed that such multigraft copolymers represent a new class of thermoplastic elastomers (TPEs) with superior elongation at break and low residual strains as compared to conventional TPEs.