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- W2089762620 abstract "Abstract Hydroxyl radicals generated pulse radiolytically in dilute N 2 O-saturated aqueous solutions of poly(methacrylic acid) (2.5×10 −3 –1×10 −2 mol dm −3 , MW=2.8×10 5 Da; p K a ≈7) react with this polymer with rate constants of 3.1×10 7 dm 3 mol −1 s −1 (protonated form) and 1.2×10 8 dm 3 mol −1 s −1 (deprotonated form). The primary and secondary carbon-centred radicals thus generated are characterized by an UV spectrum displaying a shoulder at around 320 nm. Changes in the UV spectrum in the 10 ms time range have been attributed to an H-transfer from a methylene group to a primary radical site. The secondary radicals undergo chain scission ( k =1.8 s −1 at pH 7–9) as has been followed by pulse radiolysis with conductometric detection. The ensuing end-chain radicals undergo efficient depolymerization resulting in the release of monomer." @default.
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- W2089762620 date "1999-10-01" @default.
- W2089762620 modified "2023-09-26" @default.
- W2089762620 title "Some aspects of the radiolysis of poly(methacrylic acid) in oxygen-free aqueous solution" @default.
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- W2089762620 doi "https://doi.org/10.1016/s0969-806x(99)00332-1" @default.
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