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- W2068328277 abstract "Abstract The reactivity of free radicals generated by the thermal decomposition of 2,2′-azobisisobutyronitrile (AIBN) is compared with that of the free radicals from 2,2′-azobis-2,4-dimethyl valeronitrile in nitrogen atmosphere at 60°C, and the reaction mode of the free radicals with carbon black surface is discussed. Also bulk polymerization of vinyl monomers such as styrene and methyl methacrylate was performed in the presence of furnace black in nitrogen at 60°C using AIBN as initiator. Typical retardation is found in the course of conversion of methyl methacrylate into the polymer, whereas inhibition is observed in the conversion of styrene which results in an induction period of the reaction. In addition, inhibition by carbon black is also found in the copolymerization of methyl methacrylate with a small amount of styrene. On the basis of the results of the conversions of different kinds of monomers, competitive reactions of 2-cyano-2-propyl radicals from AIBN and growing polymer radicals are suggested to occur preferentially on the surface of carbon black. The results are supported by the observation of the stability of the dispersion of the resulting carbon black in adequate solvents and also by gas chromatographic analysis of the pyrolysis products of the polymers bound to the surface of carbon black." @default.
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- W2068328277 date "1978-01-01" @default.
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- W2068328277 title "The competitive reactions of initiator fragments and growing polymer chains against the surface of carbon black" @default.
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- W2068328277 doi "https://doi.org/10.1016/0008-6223(78)90114-8" @default.
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