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Radiation chemistry of arylpolyester blends with a polyalkanoate
Author(s) -
Babanalbandi Ahmad,
Hill David J T
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199910)48:10<963::aid-pi255>3.0.co;2-k
Subject(s) - radiolysis , polyester , polycarbonate , bisphenol a , glass transition , miscibility , materials science , polymer chemistry , radical , bisphenol , radiation chemistry , chemistry , polymer , organic chemistry , chemical reaction , composite material , epoxy
The γ‐radiolysis of a series of blends of bisphenol‐A polycarbonate and poly(bisphenol‐A‐ co ‐phthalate) with poly(3‐hydroxybutyrate‐ co ‐3‐valerate) has been investigated at 77 K. The ESR spectra of the radicals formed on radiolysis have been delineated and compared with the spectra which would be expected for a linear additive model. This comparison showed that these was a greater contribution to the spectrum from the aromatic polyesters than from the aliphatic polyester. However, the radiation chemical yields for radical formation were found to adhere closely to the predictions of the linear additive model. This latter observation suggests that the blends are not miscible at the level required for effective radiation protection of the aliphatic polyester which has a much higher sensitivity to radiation damage. Thermal analyses of the blends showed two glass transition temperatures at those of the homopolymer components, typical of the behaviour of a phase‐separated system, but there was also evidence of a modified crystalline structure in the aliphatic polyester through a depression of the melting temperature in the blends. © 1999 Society of Chemical Industry