25 MeV/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
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摘要: 通过25 MeV/u 86 Kr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（3.40-7.25 keV/nm）和离子注量(5×1011----3×1012 ions/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 5×1011 to 3×1012 ions/cm2. The behaviour of the main function groups with fluence and electronic stopping power were studied by using Fouriertransforminfrared(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 Xray diffraction(XRD) measurements. The Kr ion induced degradation crosssection and amorphisation crosssections(radii) for different electronic energy loss were acquired from the experimental data(FTIR and XRD) by exponential decay function respectively. Abstract: 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 5×1011 to 3×1012 ions/cm2. The behaviour of the main function groups with fluence and electronic stopping power were studied by using Fouriertransforminfrared(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 Xray diffraction(XRD) measurements. The Kr ion induced degradation crosssection and amorphisation crosssections(radii) for different electronic energy loss were acquired from the experimental data(FTIR and XRD) by exponential decay function respectively.
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