Spectroscopic and thermal studies of gamma irradiated polypropylene polymer

100MeV Ag7+ ion induced physicochemical changes in isotactic polypropylene

“…Various weak, medium and strong peaks in the region 809 to 1377 cm À1 correspond to CH 3 , CH 2 , CH bending, wagging, twisting and C-C stretching. The peaks observed near 1170 cm À1 , 999-977 cm À1 confirm the isotactic category of polypropylene used in this study [8,9]. It can be observed that the absorbance at various positions rapidly decreases with the fluence and it clearly indicates the scissioning of various C-H and C-C bonds due to 100 MeV Ag 7+ ion irradiation.…”

“…It offers attractive mechanical, electrical and thermal properties due to its relative higher degree of crystallinity and is used in many applications such as radiation-sterilized medical and pharmaceutical components, food packaging materials and cosmetics [7,15]. There are number of reports available on the effects of low as well as high-energy radiations on polypropylene, out of which, the gamma irradiation [7,9] and high energy electron irradiation [10][11][12] shows significant chemical and morphological changes. A literature survey indicates that SHI irradiation of polypropylene showed decrease in band gap, loss in crystallinity and formation of carbonyl and hydroxyl groups for 86 MeV Ni 7+ , 3.6 and 5.4 MeV C + [13,15], whereas decrease in melting and crystallization temperature for 80 MeV Si 7+ and 120 MeV Ag 9+ [14].…”

MeV energy electron beam induced damage in isotactic polypropylene

“…Various weak, medium and strong peaks in the region 809-1377 cm À1 correspond to CH 3 , CH 2 , CH bending (B), wagging (W), twisting (T), rocking (R) and C-C stretching (S). The peaks observed near 1170 cm À1 , 999-977 cm À1 confirm the isotactic category of polypropylene used in this study [13,14]. A precise comparison of pristine and electron irradiated polypropylene reveals that the absorbance corresponding to both C-H stretching and bending vibrations in the regions 2800-3000 cm À1 and 1450-1480 cm À1 found a gradual decrease with the fluence.…”

Co-60 gamma radiation assisted diffusion of iodine in polypropylene

“…The graphs in all these figures are appended for comparison. In the spectrum of pristine PP, the peaks observed near 1170 cm À1 , 999 cm À1 -977 cm À1 confirm its isotactic category [29]. The peaks in the region 2800-3100 cm À1 correspond to CH 3 , CH 2 , CH stretching, while CH 3 and CH 2 bending are found around 1450-1480 cm À1 .…”