Radiation chemical yield blends

Other works confirm that the radiation protection is not efficient when aromatic rings are not located into the macromolecular backbone. Babanalbandi and HilP studied immiscible blends of arylpolyesters (bisphenol-A polycarbonate and poly(bisphenol-A-co-phtalate) and poly(3-hydroxybutyrate-co-3-valerate). y-irradiation was performed at 77 K and blends were analyzed by ESR (electron spin resonance). Aromatic polyesters had a greater contribution to the spectrum than the aliphatic one, and this result was explained by the fact that ejected electrons were scavenged more efficiently by the aromatic polymers. Nevertheless, the radiation chemical yields for radical formation in the blends were close to that expected according to the linear additive model. The authors concluded that both polymers are not miscible at the level required for effective radiation protection of poly(3-hydroxybutyrate-co-3-valerate). 

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