Lamellar Thickness and Stretching Temperature Dependency of Cavitation in Semicrystalline Polymers

doi:10.1371/journal.pone.0097234

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	Lamellar Thickness and Stretching Temperature Dependency of Cavitation in Semicrystalline Polymers
	Wang, Yaotao; Jiang, Zhiyong; Fu, Lianlian; Lu, Ying; Men, Yongfeng
刊名	PLOS ONE
	2014-05-12
卷号	9 期号:5
ISSN号	1932-6203
DOI	10.1371/journal.pone.0097234
英文摘要	Polybutene-1 (PB-1), a typical semicrystalline polymer, in its stable form I shows a peculiar temperature dependent strain-whitening behavior when being stretched at temperatures in between room temperature and melting temperature of the crystallites where the extent of strain-whitening weakens with the increasing of stretching temperature reaching a minima value followed by an increase at higher stretching temperatures. Correspondingly, a stronger strain-hardening phenomenon was observed at higher temperatures. The strain-whitening phenomenon in semicrystalline polymers has its origin of cavitation process during stretching. In this work, the effect of crystalline lamellar thickness and stretching temperature on the cavitation process in PB-1 has been investigated by means of combined synchrotron ultrasmall-angle and wide-angle X-ray scattering techniques. Three modes of cavitation during the stretching process can be identified, namely "no cavitation" for the quenched sample with the thinnest lamellae where only shear yielding occurred, "cavitation with reorientation" for the samples stretched at lower temperatures and samples with thicker lamellae, and "cavitation without reorientation" for samples with thinner lamellae stretched at higher temperatures. The mode "cavitation with reorientation" occurs before yield point where the plate-like cavities start to be generated within the lamellar stacks with normal perpendicular to the stretching direction due to the blocky substructure of the crystalline lamellae and reorient gradually to the stretching direction after strain-hardening. The mode of "cavitation without reorientation" appears after yield point where ellipsoidal shaped cavities are generated in those lamellae stacks with normal parallel to the stretching direction followed by an improvement of their orientation at larger strains. X-ray diffraction results reveal a much improved crystalline orientation for samples with thinner lamellae stretched at higher temperatures. The observed behavior of microscopic structural evolution in PB-1 stretched at different temperatures explains above mentioned changes in macroscopic strain-whitening phenomenon with increasing in stretching temperature and stress-strain curves.
语种	英语
出版者	PUBLIC LIBRARY SCIENCE
WOS记录号	WOS:000336653300096
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/53175]
专题	中国科学院化学研究所
通讯作者	Men, Yongfeng
作者单位	Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Univ Chinese Acad Sci, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yaotao,Jiang, Zhiyong,Fu, Lianlian,et al. Lamellar Thickness and Stretching Temperature Dependency of Cavitation in Semicrystalline Polymers[J]. PLOS ONE,2014,9(5).
APA	Wang, Yaotao,Jiang, Zhiyong,Fu, Lianlian,Lu, Ying,&Men, Yongfeng.(2014).Lamellar Thickness and Stretching Temperature Dependency of Cavitation in Semicrystalline Polymers.PLOS ONE,9(5).
MLA	Wang, Yaotao,et al."Lamellar Thickness and Stretching Temperature Dependency of Cavitation in Semicrystalline Polymers".PLOS ONE 9.5(2014).