摘要
The effects of physical ageing on the crazing of polyphenylquinoxaline(PPQ E) films were studied. The DSC endothermic 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.
The effects of physical ageing on the crazing of polyphenylquinoxaline(PPQ E) films were studied. The DSC endothermic 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第3期511-513,共3页
Chemical Journal of Chinese Universities
基金
国家科技部基础性研究重大关键项目 !(批准号 :95 11)
高分子物理开放实验室基金!资助课题
