Toughness of Glassy−Semicrystalline Multiblock Copolymers
Toughness of Glassy−Semicrystalline Multiblock Copolymers
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DOI：
10.1021/ma0611319
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发表时间：
2006-08
期刊：
影响因子：
5.5
通讯作者：
Alhad Phatak;Lisa S. Lim;C. Reaves;F. Bates
中科院分区：
文献类型：
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作者：
Alhad Phatak;Lisa S. Lim;C. Reaves;F. Bates
我们报道了由聚（环己基乙烯）（C）和聚乙烯（E）组成的层状玻璃态半结晶嵌段共聚物的力学性能的研究。拉伸性能的多域CEC，ECEC，CECEC，和ECECE嵌段共聚物，以及这些材料的共混物，揭示了一个关键的依赖于半结晶E块的连接。一个分子参数直接相关的桥接E嵌段的分数被确定，它捕获的断裂行为的C/E嵌段共聚物在一系列的链架构。对定向嵌段共聚物的拉伸测试和小角X射线散射（SAXS）实验揭示了玻璃态C嵌段中桥连的作用，并进一步阐明了控制玻璃态-半结晶嵌段共聚物中微相分离片层结构域变形和宏观断裂的机制。
We report a study on the mechanical properties of lamellae-forming glassy−semicrystalline block copolymers composed of poly(cyclohexylethylene) (C) and polyethylene (E). Tensile properties of polydomain CEC, ECEC, CECEC, and ECECE block copolymers, and blends of these materials, reveal a critical dependence on the connectivity of the semicrystalline E blocks. A molecular parameter directly related to the fraction of bridging E blocks is identified, which captures the fracture behavior of C/E block copolymers over a range of chain architectures. Tensile testing and small-angle X-ray scattering (SAXS) experiments on aligned block copolymers reveal the role of bridging in the glassy C block and further elucidate the mechanisms that govern the deformation of microphase-separated lamellar domains and macroscopic fracture in glassy−semicrystalline block copolymers.