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| 物理老化对聚苯基单醚喹啉薄膜银纹化的影响 | |
| 引用本文： | 刘万军,沈静姝,王茁,卢凤才,徐懋. 物理老化对聚苯基单醚喹啉薄膜银纹化的影响[J]. 高等学校化学学报, 2001, 22(3): 511-513 |
| 作者姓名： | 刘万军 沈静姝 王茁 卢凤才 徐懋 |
| 作者单位： | 1. 中国科学院长春应用化学研究所, 2. 中国科学院化学研究所分子科学中心, 高分子物理与化学国家重点实验室, 3. 吉林大学南岭校区应用化学系, |
| 基金项目： | 科技部"攀登计划",高分子物理开放实验室基金,9511,,, |
| 摘 要： | 物理老化实质上是聚合物材料在 Tg 以下存放过程中 ,其凝聚态结构通过链段或更小运动单元的运动 ,从热力学非平衡态向平衡态过渡的一个结构弛豫过程[1] .在这一过程中 ,聚合物的密度、自由体积、焓、熵和力学性质随温度和时间产生变化 .因为银纹化是聚合物的特性 ,所以银纹化也将随结构回复过程而产生变化 .有关物理老化对聚合物银纹化的影响尚未得出一致的结论 [2～ 4 ] .聚苯基单醚喹啉 (结构见 Scheme1 )是一种高性能的芳杂环聚合物 [5] ,它可以在比较苛刻的条件下作为绝缘材料和膜材料使用 .有关这类高性能的芳杂环聚合物的物理老化… |
| 关 键 词： | 物理老化 聚苯基单醚喹啉 银纹化 |
| 文章编号： | 0251-0790(2001)03-0511-03 |
| 修稿时间： | 2000-04-05 |
The Effects of Physical Ageing on Crazing of Polyphenylquinoxaline Films |
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| LIU Wan-Jun,SHEN Jing-shu,WANG Zhuo,LU Feng-Cai,XU Mao. The Effects of Physical Ageing on Crazing of Polyphenylquinoxaline Films[J]. Chemical Research In Chinese Universities, 2001, 22(3): 511-513 | |
| Authors: | LIU Wan-Jun SHEN Jing-shu WANG Zhuo LU Feng-Cai XU Mao |
| Abstract: | 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. |
| Keywords: | Physical ageing Polyphenylquinoxaline Crazing |
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