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

Shiv Govind Prasad | Zendy; Abhijit De | Zendy; Udayan De | Zendy

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

Author(s) -

Shiv Govind Prasad,

Abhijit De,

Udayan De

Publication year - 2011

Publication title -

international journal of spectroscopy

Language(s) - English

Resource type - Journals

eISSN - 1687-9457

pISSN - 1687-9449

DOI - 10.1155/2011/810936

Subject(s) - fourier transform infrared spectroscopy , crystallinity , polyethylene terephthalate , materials science , irradiation , polymer , infrared , spectroscopy , radical , absorption (acoustics) , infrared spectroscopy , analytical chemistry (journal) , photochemistry , chemistry , optics , composite material , organic chemistry , physics , quantum mechanics , nuclear physics

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 γ-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 γ-radiation. Further, the free radicals react with oxygen of air to form carbonyl group and hydroxyls. With increasing γ-dose, there is a red shift of the UV—near visible cutoff for PET. XRD and FTIR observations on γ-damage have been correlated

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