HyperMacs to HyperBlocks: A Novel Class of Branched Thermoplastic Elastomer
HyperMacs to HyperBlocks: A Novel Class of Branched Thermoplastic Elastomer
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DOI：
10.1021/ma901819f
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发表时间：
2009-11-24
期刊：
影响因子：
5.5
通讯作者：
Smith, Emily
中科院分区：
文献类型：
--
作者：
Hutchings, Lian R.;Dodds, Jonathan M.;Smith, Emily
我们在这里展示了用于合成长链超支化聚合物（HyperMac）的大分子单体方法的巨大多功能性，并描述了使用类似但改进的合成策略从聚丁二烯和聚（甲基丙烯酸甲酯）合成HyperMac。此外，我们报告了由聚苯乙烯-聚异戊二烯-聚苯乙烯三嵌段共聚物大分子单体偶联制备的全新一类 HyperMacs-HyperBlocks 的合成、形态和机械性能。透射电子显微镜（TEM）研究表明，这些非常规嵌段共聚物发生微相分离，但所得形态缺乏任何长程有序。拉伸测试表明，这些材料有望成为新型支化热塑性弹性体 (TPE)。最后，HyperBlock (10%) 与 Kraton 生产的商业线性 TPE 的混合物显示出增强的极限拉伸应力和断裂伸长率。
We demonstrate here the great versatility of the macromonomer approach for the synthesis of long chain hyperbranched polymers (HyperMacs) and describe the synthesis of HyperMacs from polybutadiene and poly(methyl methacrylate) using analogous yet modified synthetic strategies. Furthermore, we report the synthesis, morphology, and mechanical properties of an entirely new class of HyperMacs-HyperBlocks-prepared from the coupling of polystyrene-polyisoprene-polystyrene triblock copolymer macromonomers. Transmission electron microscopy (TEM) studies show that these unconventional block copolymers undergo microphase separation, but the resulting morphologies lack any long-range order. Tensile testing shows that these materials offer promise as a new class of branched thermoplastic elastomer (TPE). Finally, blends of HyperBlock (10%) with a commercial linear TPE produced by Kraton show both enhanced ultimate tensile stress and elongation at break.