Mechanism of polymorph selection during crystallization of random butene-1/ethylene copolymer
Mechanism of polymorph selection during crystallization of random butene-1/ethylene copolymer
复制标题
无规1-丁烯/乙烯共聚物结晶过程中多晶型选择机制
DOI：
10.1007/s10118-016-1802-8
复制
发表时间：
2016-08-01
影响因子：
4.3
通讯作者：
Men, Yong-feng
中科院分区：
文献类型：
--
作者：
Wang, Yao-tao;Liu, Pei-ru;Men, Yong-feng
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.
