Citation: Yao-tao Wang, Pei-ru Liu, Ying Lu, Yong-feng Men. Mechanism of Polymorph Selection during Crystallization of Random Butene-1/Ethylene Copolymer[J]. Chinese Journal of Polymer Science, ;2016, 34(8): 1014-1020. doi: 10.1007/s10118-016-1802-8 shu

Mechanism of Polymorph Selection during Crystallization of Random Butene-1/Ethylene Copolymer

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: Yong-feng Men, men@ciac.ac.cn
Received Date: 28 February 2016
Revised Date: 3 March 2016
Accepted Date: 3 March 2016

Fund Project: This work was financially supported by the National Natural Science Foundation of China 51525305This work was financially supported by the National Natural Science Foundation of China 21134006

Starting from an initial sample of butene-1/ethylene copolymer with stable form Ⅰ', we examined the nucleation of different crystalline polymorphs (here metastable form Ⅱ and stable form Ⅰ') at different isothermal crystallization temperatures after being melted at different melt temperature (T_melt). When T_melt was just above the melting temperature (T_m) of the crystallites, self-seeding took place. There, residue crystallites served as nuclei leading to the crystallization of the same crystalline phase. When T_melt was a few degrees above the T_m, self-seeding was disabled due to complete melting of the initial crystals. Upon crystallization, the selection of the different polymorphs in this random copolymer was found to depend on an interplay between the domain size of segregated long crystallizable sequences and the size and energy barrier of the critical nucleus of the respective crystalline forms. Our results provide a clear understanding of the polymorphs selection during crystallization of a random copolymer as well as homo-polymers under confinement.
- Crystallization,
- Random copolymer,
- Polybutene-1,
- Polymorphism
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