25MeV/u Kr辐照下PET薄膜的损伤机制研究

Damage Mechanism of PET Irradiated by 25 MeV/u Kr Ions

通过25MeV/u86Kr离子辐照叠层结晶聚对苯二甲酸乙二醇酯膜(PET),在不同的电子能损(3.407.25keV/nm)和离子注量(5×10113×1012ions/cm2)辐照条件下,对Kr离子在PET中引起的辐照损伤效应进行了研究。借助傅里叶变换红外光谱分析,通过对样品的红外吸收峰进行扣除基底后的Lorentz拟合,分析了与主要官能团对应的吸收峰强度的变化趋势,研究了化学结构与组分在重离子辐照下的变化规律;利用X射线衍射光谱仪测量,研究了Kr离子在PET潜径迹中引起的非晶化过程,并通过对吸光度和非晶化强度随离子注量的指数衰减规律的分析,获得了不同电子能损离子辐照PET时主要官能团的损伤截面和非晶化截面及对应的潜径迹半径。

At room temperature,polyethylene terephthalate（PET） foil stacks were irradiated by 25 MeV/u Kr ions in the electronic stopping power range（3.3～7.66 keV/nm） and the fluence range from 5×10^11 to 3×10^12 ions/cm^2.The behaviour of the main function groups with fluence and electronic stopping power were studied by using Fourier-transform-infrared（FTIR） spectroscopy,the degradation of the function group was investigated with the Lorentz fitting subtracted baseline.The amorphous processes in the latent tracks of PET were studied by X-ray diffraction（XRD） measurements.The Kr ion induced degradation cross-section and amorphisation cross-sections（radii） for different electronic energy loss were acquired from the experimental data（FT-IR and XRD） by exponential decay function respectively.