用正电子谱学研究高聚物材料的压力弛豫过程

用正电子谱学研究高聚物材料的压力弛豫过程 PRESSURE RELAXATION OF POLYMERS STUDIEDBY POSITRON SPECTROSCOPY 张少平 Zhang Shaoping 1 first-author 何春清 He Chunqing 1 王采林 Wang Cailin . Wang Shaojie 1 王少阶 1 武汉大学物理学系 武汉大学物理学系 Department of Physics. Wuhan University Department of Physics. Wuhan University 用正电子谱学研究了高分子材料聚苯乙烯和聚氯乙烯压力弛豫过程中微观结构的变化，测量了聚苯乙烯及聚氯乙烯在加压力后的样品中正电子寿命随弛豫时间的变化。并讨论了正电子辐射效应和实验方法对实验结果的影响。 The Pressure relaxation process of two polymers : polystyrene （ps） and polyvinyl chloride （pvc ） have been studied by positron spectroscopy. The positron lifetime spectra were measured as a function of relaxation time ranged from 0 to 90. The results show that the size of free-volume holes was constant but the concentration of free-volume holes was changed during the relaxation process, the positron irradiation effect is also discussed. 正电子湮没 高聚物 压力弛豫 自由体积 TQ320.774 国家自然科学基金(61672102) 1997-03-01 2021-04-01 3