Radiation chemical yield poly

Perera MCS, Hill DJT (1999) Radiation chemical yields G values, fit Brandrup J, Immergut EH, Gmlke EA (eds) Polymer handbook, 4th edn. Wiley-Interscience, New York Pich A, Lu Y, Adler H-J, Schmidt T, Amdt K-F (2002) Dispersion polymerization of pyrrole in the presence of poly(vinyl methyl ether) microgels. Polymer 43 5723-5729... 

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). 

Figure 5.8 Irradiation of poly(ethylene oxide) in vacuo with Co-y-rays. Radiation chemical yields of crosslinking and main-chain scission as a function of temperature. Adapted with permission from Ref [65] 1970, Wiley-VCH.

Fig. 3.21. Quantum yield of Norrish Type II reaction as a function of temperature for 0.5 mm poly(styrene-co-phenyl vinyl ketone) films irradiated with monochromatic radiation of 313 nm as measured by gel permeation chromatography [874]. (Reprinted with permission from [874]. Copyright (1984) American Chemical Society.)...

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