期刊
POLYMER
卷 55, 期 5, 页码 1267-1272出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.01.034
关键词
Crystallization; Stretching; Chain-folding
资金
- National Natural Science Foundation of China [20825415, 21274061]
- National Basic Research Program of China [2011CB606100]
- Program for Changjiang Scholars and Innovative Research Team in University
We performed dynamic Monte Carlo simulations of isothermal crystallization of bulk polymers at a high temperature, which was induced by a homogeneous stretching with a constant strain rate over a wide range of strains. We observed that the crystallites exhibit variable trends of chain folding in three sequential regions of strains, revealing hierarchical mechanisms of strain-induced polymer crystallization: in the first region, sporadic stretched segments initiate intermolecular crystal nucleation with less chain folding at higher strains; in the second region, massive less-stretched segments perform crystal growth with more chain folding at higher strains; in the third region, those folded chains extend via a melting-recrystallization process, again with less chain folding at higher strains. Different trends of chain-folding between crystal nucleation and growth appear intrinsic and ultimately lead to shish-kebab crystals. Our observations provided a molecular-level rationale to understand various experimental phenomena upon the processing for oriented semi-crystalline polymers. (C) 2014 Elsevier Ltd. All rights reserved.
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