Stretching of semicrystalline polymer materials is fundamentally important in their mechanical performance and industrial processing. By means of dynamic Monte Carlo simulations, we compared the parallel stretching processes between the initially bulk amorphous and semicrystalline polymers at various temperatures. In the early stage of stretching, semicrystalline polymers perform local and global melting-recrystallization behaviors at low and high temperatures, while the memory effects occur upon global melting-recrystallization at middle temperatures. However, the final crystallinities, crystalline bond orientations, chain-folding probabilities, residual stresses, and crystallite morphologies at high enough strains appear as the same at each temperature, irrelevant to the initially amorphous and semicrystalline polymers, indicating that the common post-growth melting-reorganization processes determine the final products. In addition, both final products harvest the highest crystallinities in the middle temperature region because the postgrowth stage yields the vast nuclei followed with less extent of crystal growth in the low temperature region and few nuclei followed with large extent of crystal growth in the high temperature region. Our observations imply that a large enough strain can effectively remove the thermal history of polymers, similar to the thermal treatment at a high enough temperature; therefore, the fracture strength of semicrystalline polymers depends upon their final structures in stretching, not related to their nascent semicrystalline structures.
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14 April 2022
Research Article|
April 11 2022
Nascent structure memory erased in polymer stretching
Special Collection:
Memory Formation
Wen Luo
;
Wen Luo
School of Chemistry and Chemical Engineering, State Key Lab of Coordinate Chemistry, Nanjing University
, Nanjing 210023, China
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Yihuan Yu;
Yihuan Yu
School of Chemistry and Chemical Engineering, State Key Lab of Coordinate Chemistry, Nanjing University
, Nanjing 210023, China
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Jiping Wang;
Jiping Wang
School of Chemistry and Chemical Engineering, State Key Lab of Coordinate Chemistry, Nanjing University
, Nanjing 210023, China
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Wenbing Hu
Wenbing Hu
a)
School of Chemistry and Chemical Engineering, State Key Lab of Coordinate Chemistry, Nanjing University
, Nanjing 210023, China
a)Author to whom correspondence should be addressed: wbhu@nju.edu.cn
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a)Author to whom correspondence should be addressed: wbhu@nju.edu.cn
Note: This paper is part of the JCP Special Topic on Memory Formation.
J. Chem. Phys. 156, 144904 (2022)
Article history
Received:
December 31 2021
Accepted:
March 22 2022
Citation
Wen Luo, Yihuan Yu, Jiping Wang, Wenbing Hu; Nascent structure memory erased in polymer stretching. J. Chem. Phys. 14 April 2022; 156 (14): 144904. https://doi.org/10.1063/5.0083952
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