电子束辐照ETFE薄膜的结构变化研究

The structural changes of ETFE films irradiated by electron beam

在空气气氛、吸收剂量分别为60kGy、120kGy、180kGy、240kGy、300kGy条件下,采用电子束对乙烯-四氟乙烯共聚物(ETFE)薄膜进行辐照,研究辐照后ETFE薄膜的结构变化。结果表明:辐照引起ETFE薄膜的表面氧化,在1758cm^(-1)和1850cm^(-1)处出现新的红外特征峰。随吸收剂量的增加,其结晶度发生变化,在120kGy吸收剂量下,ETFE薄膜的最大结晶度为38%。随吸收剂量增加,辐照后ETFE的内部分子链断裂程度增加,其分子链变短,分子量变小。当吸收剂量为300kGy时,ETFE薄膜的长周期和回转半径最小分别为15.41nm和7.55nm。辐照后ETFE薄膜的微观结构变化对于其在离子交换膜和滤膜应用具有重要的学术意义和工程价值。

The ethylene-tetrafluoroethylene copolymer(ETFE)films were irradiated by the electron beam under air atmosphere and absorbed doses of 60kGy,120kGy,180kGy,240kGy and 300kGy,respectively,and the structural changes of ETFE after irradiation were investigated.The results showed that irradiation induced surface oxidation of ETFE films,and new infrared characteristic peaks appeared at 1758cm^(-1) and 1850cm^(-1).The crystallinity changed with the absorbed dose increasing,and the maximum crystallinity of the ETFE film was 38%at 120 kGy absorbed dose.With the increase of absorbed dose,the internal molecular chain breakage of ETFE increased,the molecular chain became shorter,and the molecular weight became smaller.When the absorbed dose was 300kGy,the minimum long period and rotation radius of ETFE film were 15.41nm and 7.55nm,respectively.The microstructure changes of ETFE films after irradiation had an important academic significance and engineering value for their application in ion exchange and filter films.