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The polymerization of methyl methacrylate in solutions of three polyisoprenes (rubber, gutta‐percha, and chicle gutta) results in a product which can be separated by fractional extraction and precipitation into free polyisoprene, free polymethyl methacrylate, and a compound of the two polymers. The molecular weight of the polymethyl methacrylate component in this compound is about the same as that of the free polymer. In solution this compound hinders the precipitation of polyisoprenes and this phenomenon is responsible for previous failures to separate free polyisoprene from reaction products by fractional precipitation. Polyisoprenes retard the polymerization, the effect increasing from chicle gutta ( M n ∼ 15,000) to rubber ( M n ∼ 500,000).
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Allen et al. (1956) studied this question.
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