Frustrated Crystallization in the Coupled Viscoelastic Phase Separation

Frustrated Crystallization in the Coupled Viscoelastic Phase Separation
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耦合粘弹性相分离中的受阻结晶

DOI:
10.1021/ma301592a
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发表时间:
2012-10
期刊:
影响因子:
5.5
通讯作者:
Charles C.Han
Charles C.Han
中科院分区:
化学1区
文献类型:
--
作者:
Weichao Shi;Xu-Ming Xie;Charles C.Han

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结晶和相分离之间的相互作用最近得到了深入的研究。在这项研究中,我们扩展到一个动态不对称的共混物组成的无定形聚(甲基丙烯酸甲酯)(PMMA)和结晶聚(环氧乙烷)(PEO)的研究。大的动态不对称性在浓度增长中引起网络应力。我们发现,结晶是严重受挫时,它与同时粘弹性相分离耦合。在一个单一的淬火实验中,正常的球晶生长在一个有限的温度范围内时,结晶更快,而结晶受挫时,相分离更快的深度淬火。在双骤冷实验中,在较高温度下在先前相分离之后更难发生结晶。量热结果表明,在耦合粘弹性相分离过程中,熔融温度和结晶速率均降低。我们认为,这是网络应力的浓度。
The interplay between crystallization and phase separation has been intensively studied recently. In this study, we extended the research into a dynamically asymmetric blend composed of amorphous poly(methyl methacrylate) (PMMA) and crystalline poly(ethylene oxide) (PEO). The large dynamic asymmetry induces network stress in concentration growth. We find that crystallization is seriously frustrated when it couples with a simultaneous viscoelastic phase separation. In a single quench experiment, normal spherulites grew in a limited temperature range when crystallization was faster, while crystallization was frustrated at deep quenches when phase separation was faster. In a double quench experiment, crystallization was more difficult to occur after the prior phase separation at a higher temperature. The calorimetric results indicated that both melting temperatures and enthalpies of crystallization decreased in the coupled viscoelastic phase separation. We propose that it is the network stress in the concent...
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