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An ESR and NMR study of the gamma radiolysis of a bisphenol‐A based polycarbonate and a phthalic acid ester
Author(s) -
Babanalbandi A.,
Hill D. J. T.,
Whittaker A. K.
Publication year - 1998
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/(sici)1099-1581(199801)9:1<62::aid-pat735>3.0.co;2-t
Subject(s) - radiolysis , polycarbonate , phthalic acid , materials science , polymer , phenol , bisphenol a , adipate , acrylic acid , nuclear chemistry , polymer chemistry , organic chemistry , chemistry , radical , copolymer , composite material , epoxy
A study of the γ‐radiolysis of the commercial polymers U‐polymer, UP (Unitake) and polycarbonate, PC, (Aldrich) has been undertaken using ESR spectroscopy. The G‐value of radical formation at 77 K has been found to be 0.31±0.01 for UP and 0.5±0.02 for PC. By using thermal annealing and spectral subtraction, the paramagnetic species formed on irradiation has been assigned. The effect of radiation on the chemical structure of UP and PC has been investigated at ambient temperature and at 423 K. The NMR results show that a new phenol type chain end is formed in the polymers on exposure to γ‐radiation. The G‐value of formation of the new phenol ends was estimated to be 0.7 for PC (423 K) and 0.4 for UP (300 K). © 1998 John Wiley & Sons, Ltd.