Poly -Irradiation oxygen

Automatic amino acid analysis of polyamino acids irradiated in 0.1% oxygen-free aqueous solution showed that for PGA, PDLA, and poly-L-proline, amino acid destruction increased linearly with dose up to 1 Mrad. The 6-values from these analyses were G(-Glu) = 0.85, G(-Ala) = 1.9, G(-Pro) = 1.8. 

When a thin film prepared from poly[(tetraethyldisilanylene)bis(2,5-thienylene)] was irradiated in air with a 6-W low pressure mercury lamp bearing a Vycor filter, the absorption maximum near 340 nm disappeared within 40 min. Poly[(tetraethyldisilanylene)(2,5-thienylene)] also exhibited a rapid UV change when its thin film was irradiated. IR spectra of the resulting films reveal strong absorption bands due to Si-O-H and Si-O-Si bonds at 3300 and 1100 cm [. The formation of the Si-O-H and Si-O-Si bonds can be best explained by the reaction of the silyl radicals generated by homolytic scission of the silicon-silicon bonds in the polymer backbone with oxygen in air. The other polymers are also photoactive,... 

The electron beam irradiation of poly(e-CL) and cross-linked PDXO in argon yielded a secondary alkyl ether radical and a tertiary alkyl radical, respectively. When the irradiation was carried out in an air atmosphere, peroxy radicals were detected in poly(e-CL) but not in PDXO (150). Oxygen permeabilities of poly(e-CL), and its tri-block copolymer poly(e-CL-b-PEG-b-e-CL) were in the range of 10 10 to 10 9 cm3 (STP) cm/cm2sec cm Hg [184]. 

In carbon tetrachloride poly(a-methylstyrene) were degraded, even without oxygen, by the irradiation of ionizing radiation [58], The decay of the charge transfer radical complex, observed in this solvent, may be due to the reaction of a chlorine atom with p-site H of poly(a-methylstyrene) the reaction leads to the formation of P-position radicals of poly(a-methylstyrene). The produced polymer radicals were unstable and dissociated into neutral and radical species. 

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