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Infrared study of combined effect of γ‐radiation and elevated temperature on poly(vinyl chloride)
Author(s) -
Rabie S. M.,
Moharram M. A.,
Daghistani A. Y.
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300122
Subject(s) - vinyl chloride , crystallinity , irradiation , infrared spectroscopy , analytical chemistry (journal) , infrared , peroxide , materials science , absorption (acoustics) , absorption spectroscopy , absorption band , spectroscopy , radiation , radiant intensity , nuclear chemistry , chemistry , polymer , optics , organic chemistry , composite material , physics , quantum mechanics , nuclear physics , copolymer
Infrared absorption spectroscopy has been used to investigate the combined effect of γ‐radiation and heat on poly(vinyl chloride) (PVC). The recorded spectra showed that exposure of PVC samples to gamma doses from 0.5 to 15 Mrad results in remarkable changes in the absorbances of their absorption bands. Also, the exposure to doses from 3 to 15 Mrad results in an appearance of a CO band at 1720 cm −1 and OH band at 3450 cm −1 . The nature of the formation of these bands was discussed in terms of peroxide‐mediated oxidative degradation mechanism. Moreover, it was found that heat treatment of PVC samples over the temperature range 25–180°C causes no noticeable changes in their spectra apart from slight changes in the absorbances of the bands. On other hand, it was found that heat treatment of the irradiated samples causes considerable increase in the intensity of the CO band. In addition to the well‐defined and sharp band appearing at 1720 cm −1 , the spectra of the samples irradiated with 10 and 15 Mrad exhibited two bands at 1070 and 1120 cm −1 . The obtained data led also to the conclusion that the CCl bands cannot be used as a measure of crystallinity of PVC.