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- W2002121965 abstract "In order to study the effect of substituents on the chain-transfer reactivities of nuclear-substituted benzaldehydes toward polymethyl methacrylate (poly-MMA) and polystyryl (poly-St) radicals, the chain transfer constants (C) of six kinds of benzaldehydes in radical polymerizations of these monomers were determined at 60°C. The C values of all the substituted benzaldehydes toward the poly-MMA radical were larger than that of unsubstituted benzaldehyde, regardless of the electron-repelling or electron-attracting nature of the substituents, while those toward the poly-St radical increased with an increase in the electron-attracting nature of the substituents. The relative reactivities toward the poly-MMA radical could not be correlated with the ordinary Hammett equation, but they could be with this modified equation: log(k⁄k0)=ρσ+γER, with ρ=+0.2 and γ=0.7. On the other hand, the relative reactivities toward the poly-St radical also fit a modified Hammett equation with ρ=+1.4 and γ=0.65." @default.
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- W2002121965 date "1969-05-01" @default.
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- W2002121965 title "Effects of Substituents on the Chain-transfer Reactivities of Nuclear-substituted Benzaldehydes to Polymer Radicals" @default.
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- W2002121965 doi "https://doi.org/10.1246/bcsj.42.1364" @default.
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