Structural and Optical Investigations of Radiation Damage in Transparent PET Polymer Films

被引：97
|
作者：
Prasad, Shiv Govind [1 ]
De, Abhijit [2 ]
De, Udayan [3 ]
机构：
[1] Uttar Pradesh Text Technol Inst, Dept Chem, Kanpur 208001, Uttar Pradesh, India
[2] Presidency Coll, Dept Phys, Kolkata 700073, India
[3] Variable Energy Cyclotron Ctr, 1 AF Bidhannagar, Kolkata 700064, India
来源：
INTERNATIONAL JOURNAL OF SPECTROSCOPY | 2011年
关键词：
D O I：
10.1155/2011/810936
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
Effects of gamma irradiation at different doses up to 135 kGy on polyethylene terephthalate (PET) polymer films have been investigated by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and ultraviolet-visible (UV-VIS) spectroscopy. From XRD analysis, it was found that even at a high dose of gamma irradiation of 135 kGy, crystallinity of the PET samples remain unchanged. However, the FTIR peak at 871 cm(-1) (depicting C-H bending mode of out-of-plane vibration) and another at 1303 cm(-1) (representing C-H bending mode of in-plane vibration) disappear for gamma-irradiated PET. In this study, it has also been found that gamma-irradiation in air enhances the optical absorption in the wavelength region 320-370 nm. This has been attributed to free radicals being produced in the polymer by the gamma-radiation. Further, the free radicals react with oxygen of air to form carbonyl group and hydroxyls. With increasing gamma-dose, there is a red shift of the UV-near visible cutoff for PET. XRD and FTIR observations on gamma-damage have been correlated.
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页数：7
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