Recovery of amorphous poly(ethylene terephthalate) film uniaxially drawn just below the glass transition temperature

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	Recovery of amorphous poly(ethylene terephthalate) film uniaxially drawn just below the glass transition temperature
	Sun, NJ; Yang, J; Shen, DY; Qian, RY
刊名	CHINESE JOURNAL OF POLYMER SCIENCE
	2000
卷号	18 期号:1 页码:69-75
关键词	Poly(Ethylene Terephthalate) Uniaxial Drawing Recovery Orientation
ISSN号	0256-7679
英文摘要	Isothermal recovery in the macroscopic length of homogeneously deformed specimens of amorphous poly(ethylene terephthalate) (PET) film sample uniaxially drawn at 69 degrees C to the draw ratios lambda(0) = 1.26-2.20 were studied at temperatures around the glass transition temperature (T-g = 73 degrees C). Experimental results indicate that the length recovery look place in two distinct steps: a fast first step (fast relaxation) followed by a slow second step (slow relaxation). The relaxation processes were accompanied by the reversion of trans-conformers (1340 cm(-1)) to gauche, and the dichroic function of the 1340 cm(-1) band characterizing the segmental orientation along the chain direction decreased to a very low value at the end of the fast relaxation. This fact led us to assign the fast relaxation as the segmental orientation while the slow relaxation as relaxation of the global chain orientation. It was found that the slow relaxation follows a single exponential function, with relaxation times strongly dependent on the temperature resembling the glass transition process. The fast relaxation does not follow a single exponential decay, presumably a distribution of relaxation times is involved.
语种	英语
出版者	SPRINGER-VERLAG SINGAPORE PTE LTD
WOS记录号	WOS:000085195700011
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/76355]
专题	中国科学院化学研究所
通讯作者	Qian, RY
作者单位	Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Sun, NJ,Yang, J,Shen, DY,et al. Recovery of amorphous poly(ethylene terephthalate) film uniaxially drawn just below the glass transition temperature[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2000,18(1):69-75.
APA	Sun, NJ,Yang, J,Shen, DY,&Qian, RY.(2000).Recovery of amorphous poly(ethylene terephthalate) film uniaxially drawn just below the glass transition temperature.CHINESE JOURNAL OF POLYMER SCIENCE,18(1),69-75.
MLA	Sun, NJ,et al."Recovery of amorphous poly(ethylene terephthalate) film uniaxially drawn just below the glass transition temperature".CHINESE JOURNAL OF POLYMER SCIENCE 18.1(2000):69-75.