Effect of comonomer sizes on the strain-induced crystal nucleation of random copolymers
Effect of comonomer sizes on the strain-induced crystal nucleation of random copolymers
复制标题
共聚单体尺寸对无规共聚物应变诱导晶核的影响
DOI：
10.1016/j.eurpolymj.2016.05.015
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发表时间：
2016-08-01
影响因子：
6
通讯作者：
Hu, Wenbing
中科院分区：
文献类型：
--
作者：
Nie, Yijing;Gao, Huanhuan;Hu, Wenbing
我们对随机共聚物进行了动态蒙特卡罗模拟，这些共聚物在结晶单体区域中包含不可结晶共聚体序列（反映它们的相对大小）的可变滑动迁移率。在提高应变时，我们观察到普通滑动迁移率不影响结晶度的应变演化曲线。然而，在中温区，低迁移率导致低单体共聚物的结晶成核模式从分子内模式切换到分子间模式的延迟。我们将这种影响归因于共聚单体难以被排除在有取向非晶段的序列偏析限制的成核域之外。讨论了这种影响对循环加载时晶体成核效率的影响。(C) 2016 Elsevier Ltd.版权所有。
We performed dynamic Monte Carlo simulations of random copolymers containing variable sliding mobility of non-crystallizable comonomer sequences (reflecting their relative sizes) in the crystalline monomer regions. Upon raising strains, we observed that the comononer sliding mobility does not affect the strain evolution curves of crystallinity. However, in the middle temperature region, the low mobility causes a delay of switching from the intra-molecular to the inter-molecular modes of crystal nucleation in the copolymers holding low fractions of comonomers. We attributed the effect to the difficulty of comonomers to be excluded from the nucleating domains that are limited by sequence segregation in the oriented amorphous segments. The implication of this effect to the efficiency of crystal nucleation upon cyclic loading has been discussed. (C) 2016 Elsevier Ltd. All rights reserved.