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Radical processes initiated by ionizing radiation in PEEK and their macroscopic consequences
Author(s) -
Kornacka Ewa Maria,
Przybytniak Grażyna,
Nowicki Andrzej
Publication year - 2019
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4445
Subject(s) - radical , peek , electron paramagnetic resonance , materials science , photochemistry , ionizing radiation , irradiation , ether , ion , nuclear magnetic resonance , polymer , chemistry , organic chemistry , nuclear physics , composite material , physics
Poly (ether ether ketone) was irradiated with gamma rays or electron beam to investigate the radical process. The generated paramagnetic species were observed by electron spin resonance spectroscopy at ambient temperature and in liquid nitrogen. The effect of microwave power on saturation of the particular spectra and thermal annealing effects were determined. The following radicals were identified: radical anion, phenoxyl radical, and phenylperoxy radical. Despite the fact that the intermediates were formed as a result of backbone cleavage causing degradation, the macroscopic features were almost unaffected by irradiation up to dose of 1500 kGy.