辐射交联聚乙烯的正电子湮灭研究  

Positron Annihilation Study of Irradiated Crosslinking Polyethylene

作　　者：程明福[1] 叶邦角[1] 成斌[1] 张宪锋[1] 郗传英[1] 张良平[1] 翁惠民[1] 周先意[1] 

机构地区：[1]中国科学技术大学近代物理系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2005年第6期892-896,共5页化学物理学报（英文）

基　　金：ProjectsupportedbytheChineseNaturalScienceFound(10175061;10475072)andtheImportantDirectionalityProjectoChineseAcademyofScience.

摘　　要：用正电子寿命谱(PALS)研究了γ辐射交联和紫外光交联聚乙烯(PE),结果表明,它能有效地检测PE交联过程中交联度、结晶度的变化和影响以及氧的影响,并且发现PALS对辐射交联过程中微量氧参与的反应是非常敏感的.观察到光交联PE的PALS强度变化规律与γ辐射交联相反,这与交联样品的制备过程和紫外光使光引发剂的强吸电子基团羰基转变成弱吸电子基团羟基有关.还利用双符合多普勒展宽谱的参数佐证了PALS结果中oPs拾取湮灭强度的变化规律与辐照过程中氧的影响.Positron annihilation lifetime spectroscope （PALS） was applied to investigate the micro-structural changes of polyethylene（PE） which was irradiated by γ-ray or ultraviolet radiation, the spectra were decomposed into three lifetime components using PATFIT package. Then it was found that the shifts of the degree of cross linking and crystallinity were detected effectively in samples. Moreover, a small quantity of oxygen, which involved in the cross-linking process, was measured sensitively by PALS. The regularity of positron lifetime intensity vs radiation intensity in γ irradiated sample was opposite to that in ultraviolet irradiated one, which is due to the preparation methods of samples and the change of polar functional group in initiator. Furthermore, contrastive patterns were studied by positron doppler broaden （DB） method and the results were agreed well with PALS data mentioned above.

关 键 词：正电子 聚乙烯 辐射交联 

分 类 号：O571.23[理学—粒子物理与原子核物理]