摘要
用红外光谱法研究了聚乙烯醇(PVA)薄膜在204Tlβ辐射和单能电子束作用下的变化。真空干燥的PVA膜受β和单能电子束作用以发生断链降解为主,反应生成的端基双键随剂量的增加而增加;自然干燥的PVA膜则在1500—2200cm-1出现密集的不饱和键吸收峰,峰高随剂量的增加而增强,然后逐渐减弱以致消失。本文提出了增强PVA抗β辐射能力的处理方法。
We studied the radiation damage of PVA thin films under the different drying condition i.e. in vacuum dry oven or in air (so it remains some of water). The films were exposed to 204 Tl β radiation and single energy electron beam(EB) from electron accelerator respectively.Then the reactions resulting from exposoure to β or EB were detected by infrared (IR) spectrum analysis.In spectra for vacuum drying films the absorption peak centered around 1640cm -1 and increased with dose increment indicating that the radiation damage is link breadage and degredation.In spectra for air drying film,many new low absorption peaks appear in the region 1600～2200cm -1 (polyenyl CH=CH n etc.).With the dose increment the intensity increases originally then decreases gradually and disappears finally.It shows cross linking takes place.So we suggest that by rising crystallinity and inducing the amorphous region cross linking can decrease β radiation damage.
出处
《化学研究与应用》
CAS
CSCD
1999年第4期374-378,共5页
Chemical Research and Application
基金
中国工程物理研究院科学基金
关键词
聚乙烯醇
β辐射
电子束
辐射损伤
氘
氚
容器
poly(vinyl alcohol),β radiation,electronic beam,radiation damage,IR spectrum
