Relationship between melting behavior and morphological changes of semicrystalline polymers

	Relationship between melting behavior and morphological changes of semicrystalline polymers
	Wei, Zhiyong 1; Yu, Yang 1; Zhou, Cheng 1; Zheng, Liuchun 2; Leng, Xuefei 1; Li, Yang 1
刊名	JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
	2017-08-01
卷号	129 期号:2 页码:777-787
关键词	Poly(Hexamethylene Succinate) Melting Behavior Morphological Changes Annealing
英文摘要	The present study on the case of poly(hexamethylene succinate) is to provide a basis for a better understanding of the subtle relationship between melting behavior and morphological changes of semicrystalline polymers. The melting behavior and morphological changes of poly(hexamethylene succinate) during both isothermal secondary crystallization and annealing processes were investigated by DSC and SAXS. DSC results showed that, with increasing crystallization time or annealing time, the melting endotherm continuously shifted to higher temperature, which suggested that some minor structural or morphological changes must occur. However, almost no changes at all on the crystal thickness were observed from SAXS measurements. The observed evidence confirmed that the increase in the melting temperature is not attributed to crystal thickening but crystal perfection. More exactly, the rearrangement and smoothing of tie molecules at the folding surface result in the reduction of the fold surface free energy, which dominantly contributes to the increase in the melting peak temperature. The origin of the new endothermic peak observed after annealing at elevated temperature was also discussed. TMDSC results indicated that the annealing peak resulted from the enthalpy relaxation and devitrification transition of rigid amorphous fraction formed by the driving force of thermodynamic nonequilibrium, rather than usually regarded as the melting of thin lamellae or imperfect crystals formed by annealing secondary crystallization.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/39006]
专题	化学研究所_工程塑料实验室
作者单位	1.Dalian Univ Technol, Sch Chem Engn, Dept Polymer Sci & Mat, State Key Lab Fine Chem, Dalian 116024, Peoples R China 2.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Wei, Zhiyong,Yu, Yang,Zhou, Cheng,et al. Relationship between melting behavior and morphological changes of semicrystalline polymers[J]. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,2017,129(2):777-787.
APA	Wei, Zhiyong,Yu, Yang,Zhou, Cheng,Zheng, Liuchun,Leng, Xuefei,&Li, Yang.(2017).Relationship between melting behavior and morphological changes of semicrystalline polymers.JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,129(2),777-787.
MLA	Wei, Zhiyong,et al."Relationship between melting behavior and morphological changes of semicrystalline polymers".JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 129.2(2017):777-787.