Direct Formation of Different Crystalline Forms in Butene-1/Ethylene Copolymer via Manipulating Melt Temperature

doi:10.1021/ma5019796

CORC > 化学研究所 > 中国科学院化学研究所

	Direct Formation of Different Crystalline Forms in Butene-1/Ethylene Copolymer via Manipulating Melt Temperature
	Wang, Yaotao; Lu, Ying; Zhao, Jiayi; Jiang, Zhiyong; Men, Yongfeng
刊名	MACROMOLECULES
	2014-12-23
卷号	47 期号:24 页码:8653-8662
ISSN号	0024-9297
DOI	10.1021/ma5019796
英文摘要	The crystallization behavior of a butene-1/ethylene random copolymer with 9.88 mol % ethylene counits was investigated by means of differential scanning calorimetry, wide- and small-angle X-ray scattering, and polarized optical microscopy. Unlike in its homopolymer counterpart which crystallizes always into a metastable form II from the melt state, the random copolymer was found to crystallize either into form II or stable form I' directly from its melt state after being cooled down. The occurrence of either crystalline form only depended on the temperature where the crystalline material was molten before cooling down. Even though the material was brought to temperatures higher than the equilibrium melting temperature, heterogeneities of segmental segregation character were preserved which promoted massive nucleation of form I' crystallites, which makes it possible that the material is able to crystallize into pure form I'. Only if when the melt temperature was high enough where all heterogeneities of the above-mentioned character were erased can the material be crystallized into pure form II. The effect is found independent of the previous crystalline form, meaning that the helical conformation of chains in the heterogeneous melt does not affect the nucleation of stable form I'.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000347138300021
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/51797]
专题	中国科学院化学研究所
通讯作者	Men, Yongfeng
作者单位	Univ Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Chinese Acad Sci, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yaotao,Lu, Ying,Zhao, Jiayi,et al. Direct Formation of Different Crystalline Forms in Butene-1/Ethylene Copolymer via Manipulating Melt Temperature[J]. MACROMOLECULES,2014,47(24):8653-8662.
APA	Wang, Yaotao,Lu, Ying,Zhao, Jiayi,Jiang, Zhiyong,&Men, Yongfeng.(2014).Direct Formation of Different Crystalline Forms in Butene-1/Ethylene Copolymer via Manipulating Melt Temperature.MACROMOLECULES,47(24),8653-8662.
MLA	Wang, Yaotao,et al."Direct Formation of Different Crystalline Forms in Butene-1/Ethylene Copolymer via Manipulating Melt Temperature".MACROMOLECULES 47.24(2014):8653-8662.