三种聚乙烯薄膜的后辐射氧化反应  

Post-radiation oxidation reaction of three types of polyethylene films

作　　者：韩磊 王静 鲁曼丽 张文礼[1] 沈蓉芳 刘伟华[1] 王谋华[1] HAN Lei;WANG Jing;LU Manli;ZHANG Wenli;SHEN Rongfang;LIU Weihua;WANG Mouhua(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《辐射研究与辐射工艺学报》2025年第1期21-31,共11页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学项目(No.12375357)。

摘　　要：聚乙烯(PE)辐照后接触氧气时发生的长期、缓慢反应即后辐射氧化反应对辐射改性PE材料的长期使用性能产生重要影响。本研究选用超高分子量聚乙烯薄膜(UHMWPE)、高密度聚乙烯薄膜(HDPE)和低密度聚乙烯薄膜(LDPE)三种典型的PE材料,采用γ射线对其进行辐照,利用傅里叶变换红外光谱对后辐射氧化反应羰基产物进行定量分析,研究温度、氧气分压和吸收剂量等因素对PE后辐射氧化行为的影响。结果表明:UHMWPE和HDPE具有明显的后辐射氧化现象,而LDPE的后辐射氧化反应微弱;UHMWPE和HDPE的后辐射氧化反应常温下可以长时间维持,且50℃时反应速率最大,70℃以上时氧化反应仅能维持几小时。后辐射氧化反应与氧气分压和吸收剂量呈显著的正相关性。本研究不仅为理解PE后辐射氧化反应提供了新视角,还可为完善辐射改性PE材料的加速老化评价方法提供指导。The long-term,slow reaction that occurs when polyethylene(PE)is exposed to oxygen after ionizing radiation is known as post-radiation oxidation,which significantly affects the long-term performance of radiation-modified PE materials.In this study,an ultrahigh molecular weight polyethylene(UHMWPE)film,a high-density polyethylene(HDPE)film,and a low-density polyethylene(LDPE)film were selected as typical PE materials and irradiated withγ-rays.Subsequently,the carbonyl products of the post-radiation slow oxidation reaction were quantitatively analyzed using Fourier transform infrared spectroscopy and by varying the temperature,oxygen partial pressure,and absorbed dose.The effects of these factors on the oxidation behavior of PE after radiation were systematically investigated.Post-radiation oxidation was clearly observed in the UHMWPE and HDPE films.Meanwhile,the LDPE film showed weak post-radiation oxidation,which could be maintained for a long time at room temperature,with the highest reaction rate occurring at 50°C.However,above 70°C,the oxidation reaction could only be maintained for a few hours.Additionally,a significant positive correlation was observed among the post-radiation oxidation reaction,oxygen partial pressure,and absorbed dose.This study not only offers a new perspective for understanding the post-radiation oxidation reaction of PE but also provides guidance for improving the accelerated-aging evaluation of radiation-modified PE materials.

关 键 词：聚乙烯 Γ射线辐照 后辐射氧化反应 傅里叶变换红外光谱 

分 类 号：TL13[核科学技术—核能科学]