The relations between properties and physical aging of polyphenylquinoxaline film

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	The relations between properties and physical aging of polyphenylquinoxaline film
	Liu, WJ; Shen, JS; Lu, FC; Xu, M
刊名	ACTA POLYMERICA SINICA
	2000-08-01
期号	4 页码:415-419
关键词	Physical Aging Dsc Pals Tensile Properties Dynamic Mechanical Properties Polyphenylquinoxaline
ISSN号	1000-3304
英文摘要	Polyphenylquinoxaline (PPQ-E) is an aromatic heterocyclic polymer with high performance and water resistance at high temperature. It was synthesized form aromatic tetraamine and aromatic tetraketone by condensation polymerization. The influence of physical aging on structure and mechanical properties of polyphenylquinoxaline has been studied. The free volume and cohensional entanglement structure of samples preapared under two different thermal conditions were measured by positron annihilation life spectroscopy (PALS) and DSC. For samples which underwent physical aging an endothermic peak at the end of the glass transition was observed in a heating process. It means more cohensional entanglement structure forms during physical aging. The results of PALS show that physical aging may reduce the free volume in samples. A little increase of storage modulus in the temperature range from 100 degrees C to 300 degrees C and a decrease of mechanical loss at 250 similar to 300 degrees C result form physical aging. The tensile mechanical tests manifest that physical aging may result in a decrease of fracture strain and energy,an increase of yield stress and a transition from ductile to brittle generate for PPQ-E samples.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000089003100006
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/75855]
专题	中国科学院化学研究所
通讯作者	Liu, WJ
作者单位	Chinese Acad Sci, Inst Chem, Polymer Phys Lab, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Liu, WJ,Shen, JS,Lu, FC,et al. The relations between properties and physical aging of polyphenylquinoxaline film[J]. ACTA POLYMERICA SINICA,2000(4):415-419.
APA	Liu, WJ,Shen, JS,Lu, FC,&Xu, M.(2000).The relations between properties and physical aging of polyphenylquinoxaline film.ACTA POLYMERICA SINICA(4),415-419.
MLA	Liu, WJ,et al."The relations between properties and physical aging of polyphenylquinoxaline film".ACTA POLYMERICA SINICA .4(2000):415-419.