A new model for mesomorphic-monoclinic phase transition of isotactic polypropylene

doi:10.1016/j.polymer.2016.11.072

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	A new model for mesomorphic-monoclinic phase transition of isotactic polypropylene
	Li, Xiangyang1 ; Ding, Jianjun 1; Liu, Yanping 2,3; Tian, Xingyou1
	2017-01-13
发表期刊	POLYMER
摘要	In this study, Fourier transform infrared spectroscopy, synchrotron small-angle and wide-angle X-ray scattering were employed to reveal the underlying mechanism leading to conformational reorganization during mesomorphic-monoclinic phase transition. Results indicated that conformation reorganization occurred from 50 to 130 degrees C, evidenced by conformational infrared bands at 800 and 841 cm(-1). The conformation reorganization led to an immediate increase in the density fluctuation but not induced phase transition immediately. Only when the long period started to increase quickly from 80 degrees C, can phase transition occur. This indicated that intrachain conformational ordering occurred prior to crystalline ordering. Moreover, temperature dependence of long period changed before and after phase transition, implying that chain sliding was the main driven force for the phase transition rather than rewinding and translation of single stems. With the new information obtained, a two-step model for phase transition was proposed. Within a single-chain bundle, two adjacent helices with opposite handedness can interlock into double helices with higher density, and urge each other extending to entire stem during moving along opposite directions with the help of chain slipping, resulting in ordered arrangement of helical stems. Afterwards, single-chain clusters coalesce, leading to interchain crystalline ordering. The new model is helpful to understand the phenomena related to mesomorphic iPP. (C) 2016 Elsevier Ltd. All rights reserved.
文章类型	Article
关键词	Conformational Reorganization Phase Transition X-ray Scattering
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1016/j.polymer.2016.11.072
关键词[WOS]	COLD CRYSTALLIZATION ; SYNDIOTACTIC POLYSTYRENE ; SCANNING CALORIMETRY ; TRIGONAL POLYMORPH ; COOLING RATE ; COPOLYMERS ; MESOPHASE ; PROPYLENE ; EVOLUTION ; SAXS
收录类别	SCI
语种	英语
项目资助者	National Natural Science Foundation of China(51303166) ; National Natural Science Foundation of China(51303166) ; National Natural Science Foundation of China(51303166) ; National Natural Science Foundation of China(51303166) ; open fund of National Center for International Research of Micro-nano Molding Technology ; open fund of National Center for International Research of Micro-nano Molding Technology ; open fund of National Center for International Research of Micro-nano Molding Technology ; open fund of National Center for International Research of Micro-nano Molding Technology ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03) ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03) ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03) ; Key Laboratory for Micro Molding Technology of Henan Province(MMT2016-03)
WOS研究方向	Polymer Science
WOS类目	Polymer Science
WOS记录号	WOS:000392356900026
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/32793
专题	应用技术研究所
作者单位	1.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Appl Technol, Key Lab Novel Thin Film Solar Cells, Hefei 230088, Peoples R China 2.Zhengzhou Univ, Natl Ctr Int Res Micronano Molding Technol, Zhengzhou 450002, Peoples R China 3.Zhengzhou Univ, Key Lab Micro Molding Technol Henan Prov, Zhengzhou 450002, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiangyang,Ding, Jianjun,Liu, Yanping,et al. A new model for mesomorphic-monoclinic phase transition of isotactic polypropylene[J]. POLYMER,2017,108(无):242-250.
APA	Li, Xiangyang,Ding, Jianjun,Liu, Yanping,&Tian, Xingyou.(2017).A new model for mesomorphic-monoclinic phase transition of isotactic polypropylene.POLYMER,108(无),242-250.
MLA	Li, Xiangyang,et al."A new model for mesomorphic-monoclinic phase transition of isotactic polypropylene".POLYMER 108.无(2017):242-250.

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