Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG)

doi:10.1016/j.jnoncrysol.2018.10.021

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	Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG)
	Guo J ; Xiao R ; Tian CS ; Jiang MQ(蒋敏强)
刊名	JOURNAL OF NON-CRYSTALLINE SOLIDS
	2018-12-15
卷号	502 页码:15-21
关键词	Physical aging Structural relaxation PETG
ISSN号	0022-3093
DOI	10.1016/j.jnoncrysol.2018.10.021
英文摘要	Amorphous glassy polymers are widely used as structural materials. However, their mechanical properties continuously evolve with physical aging, which significantly influences their applications. In this work, we investigate the effects of aging on stress response of poly(ethylene terephthalate)-glycol (PETG). The PETG specimens are either quenched or annealed around or below the glass transition temperature (T-g) for a period of time. The uniaxial compression tests are then performed at T-g-40 degrees C and strain rate 0.001/s. The quenched polymers exhibit the smallest yield strength and strain softening, indicating that negligible structural relaxation occurs for the quenched condition. For annealed polymers, the yield strength increases with aging time. The results also show that there exists an optimal temperature to achieve the highest structural relaxation rate, which is around Tg-20 degrees C. Compared with annealing at a single temperature, annealing at multiple temperatures in discrete steps is a more efficient method for structural relaxation. The same experiments are also performed on specimens with 30% predeformation. The optimal aging temperature does not change with predeformation. However, at the same annealing condition the yield strength of specimens with 30% predeformation is around 5 MPa less than that of undeformed specimens.
分类号	一类
URL标识	查看原文
WOS关键词	ENTHALPY RELAXATION ; GLASS-TRANSITION ; MOBILITY ; BEHAVIOR
WOS研究方向	Materials Science, Ceramics ; Materials Science, Multidisciplinary
语种	英语
WOS记录号	WOS:000450380000003
资助机构	National Natural Science Foundation of China [11872170, 11522221] ; Fundamental Research Funds for Central Universities, Hohai University [2016B01414] ; Opening Fund of State Key Laboratory of Nonlinear Mechanics
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/78133]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Hohai Univ, Dept Engn Mech, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China
推荐引用方式 GB/T 7714	Guo J,Xiao R,Tian CS,et al. Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG)[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2018,502:15-21.
APA	Guo J,Xiao R,Tian CS,&蒋敏强.(2018).Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG).JOURNAL OF NON-CRYSTALLINE SOLIDS,502,15-21.
MLA	Guo J,et al."Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG)".JOURNAL OF NON-CRYSTALLINE SOLIDS 502(2018):15-21.