The Effects of Physical Ageing on Crazing of Polyphenylquinoxaline Films

Chem. J. Chinese Universities ›› 2001, Vol. 22 ›› Issue (3): 511.

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The Effects of Physical Ageing on Crazing of Polyphenylquinoxaline Films

LIU Wan-Jun¹, SHEN Jing-Shu², WANG Zhuo³, LU Feng-Cai², XU Mao²

1. State Key Laboratory of Polymer Physicsand Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2. State Key Laboratory of Polymer Physicsand Chemistry, the Center of Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
3. Department of Applied Chemistry, Nanling Camp us, Jilin University, Changchun 130022, China

Received:2000-04-05 Online:2001-03-24 Published:2001-03-24

Abstract

Abstract: The effects of physical ageing on the crazing of polyphenylquinoxaline(PPQ-E) films were studied. The DSCendothermic peak at the glass transition region of the samples was interpreted in terms of the cohesional entanglement theory. The free volume cavity size and free volume intensity of the samples were characterized by positron annihilation life spectroscopy. The difference in free volume cavity size and free volume intensity between two samples reflect the strength and density of cohensional entanglement point. The critical strain for craze initiation and craze stability depended on physical ageing of the samples. The relationships between physical ageing and crazing were interpreted initially.

Key words: Physical ageing, Polyphenylquinoxaline, Crazing

CLC Number:

O631

TrendMD:

LIU Wan-Jun, SHEN Jing-Shu, WANG Zhuo, LU Feng-Cai, XU Mao . The Effects of Physical Ageing on Crazing of Polyphenylquinoxaline Films[J]. Chem. J. Chinese Universities, 2001, 22(3): 511.

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The Effects of Physical Ageing on Crazing of Polyphenylquinoxaline Films

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