Competition of crystal nucleation to fabricate the oriented semi-crystalline polymers

Competition of crystal nucleation to fabricate the oriented semi-crystalline polymers
复制标题

晶体成核竞争制备取向半晶聚合物

DOI:
10.1016/j.polymer.2013.04.047
复制
发表时间:
2013-06
期刊:
影响因子:
4.6
通讯作者:
Hu, Wenbing
Hu, Wenbing
中科院分区:
化学2区
文献类型:
--
作者:
Yu, Muhuo;Hu, Zuming;Reiter, Guenter;Hu, Wenbing

文献摘要

参考文献

被引文献

相似文献

许多聚合物材料的机械性能,如天然橡胶轮胎、塑料瓶和袋以及纺织纤维,关键取决于加工过程中晶体分子的拉伸诱导排列。然而,固化排列的潜在分子机制仍然知之甚少。我们采用动态Monte Carlo模拟揭示了在接近熔点的温度下,本体聚合物的均匀拉伸如何影响晶体成核并导致对齐的结晶分子。我们观察到,当分子应变增加超过一个临界值,新兴的微晶突然降低其可能性链折叠,对应于从分子内链折叠核的过渡到分子间的边缘胶束核。在经典形核理论的基础上,这两种共存的形核机制在自由能垒上的竞争可以很好地预测相变。
The mechanical performance of many polymeric materials, such as natural rubber tires, plastic bottles and bags, and textile fibers, depends crucially on the stretch-induced alignment of crystalline molecules in the course of processing. However, the underlying molecular mechanism to solidify the alignment is still poorly understood. We employed dynamic Monte Carlo simulations to unveil how at temperatures close to the melting point a homogeneous stretch of bulk polymers can affect crystal nucleation and leads to aligned crystalline molecules. We observed that upon the molecular strain increasing beyond a critical value, the emerging crystallites suddenly decrease their probability of chain-folding, corresponding to a transition from intramolecular chain-folding nuclei to intermolecular fringed-micelle nuclei. On the basis of the classical nucleation theory, the transition can be predicted well by the competition in the free energy barriers for these two coexisting nucleation mechanisms.
DOI: 10.1098/rspa.1964.0040
发表时间: 1964-02
期刊: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
影响因子: --
作者:
E. H. Andrews
通讯作者: E. H. Andrews
DOI: 10.1002/pol.1955.120157904
发表时间: 1955-01-01
影响因子: 3.4
作者:
KELLER, A
通讯作者: KELLER, A
烤肉串形成的临界应变
DOI: 10.1021/ma9020642
发表时间: 2010-01
期刊: Macromolecules
影响因子: 5.5
作者:
Tingzi Yan;Shiwang Cheng;Yuanhua Cong;Zijian Wang;Liangbin Li;Xiuhong Li;Guoqiang Pan;Yuye Fang;Fenggang Bian;Baijin Zhao
通讯作者: Baijin Zhao
DOI: 10.1002/pol.1978.180160911
发表时间: 1978-09
期刊: Journal of Polymer Science Part B
影响因子: --
作者:
W. Wu
通讯作者: W. Wu
DOI: 10.1016/j.polymer.2006.01.090
发表时间: 2006-04
期刊: Polymer
影响因子: 4.6
作者:
Lizhi Liu;B. Hsiao;S. Ran;B. Fu;S. Toki;F. Zuo;A. Tsou;B. Chu
通讯作者: Lizhi Liu;B. Hsiao;S. Ran;B. Fu;S. Toki;F. Zuo;A. Tsou;B. Chu