Free Volume Changes in γ-Irradiated Polyethylene and Polytetraflourethylene

作     者：Xianyi ZHOU (Dept. of Modern Physics, University of Science and Technology of China, Hefei 230027, China) Linhua ZHAI (Department of Physics, Anhui Normal University, Wuhu 241000, China) Jiangfeng DU and Rongdian HAN (Department of Modern Physics, Univers 

作者机构：Department of Modern Physics University of Science and Technology of China Hefei 230027 China Department of Physics Anhui Normal University Wuhu 241000 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2000年第16卷第3期

页      面：302-304页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 

基　　金：国家自然科学基金(19875050) 中国科学院自然科学基金 

主　　题：PTFE Irradiated Polyethylene and Polytetraflourethylene 

摘      要：Positron lifetime spectrum was measured and the change of the free volume was studied for commercial polyethylene (PE) and polytetrafluoroethylene (PTFE) during 7-irradiation processing up to 265 kGy. The free volume size increases but the crystallinity decreases as irradiation dose increases in PE. Both qualities (free volume size and crystallinity) in PTFE display an opposite behavior. The fractional free volume reduces monotonically with increasing irradiation dose in both PE and PTFE. The competition between the crosslinkmg and the splitting decomposition in polymers can be used to understand the free volume changes with irradiation dose.