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- W2105575298 abstract "The behavior of the primary radicals formed from the random scission of anionically polymerized poly(methyl methacrylate), PMMA, during thermal degradation is investigated by a theoretical and experimental study. The theoretically calculated relationship between the degree of polymerization and the conversion agrees well with the experimentally determined relationship if the random scission produces one polymer radical and one polymer molecule with an unsaturated bond at a chain end. It is proposed that the primary radical rearranges to form the polymer molecule with the unsaturated bond at a chain end. Two different degradation paths for this rearrangement are proposed via β scission at the CC bond of the pendant group instead of β scission, as previously thought, at the backbone CC bond. The products from the proposed degradation paths are CO, CO2, CH3OH, and CH4. The products for anionically polymerized PMMA samples with three different values of initial molecular weight are measured by a mass spectrometer. The quantities of CO and CO2 are observed to decrease with an increase in initial molecular weight. This confirms that the two proposed degradation paths for the thermal degradation of PMMA are quite plausible." @default.
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- W2105575298 date "1989-01-01" @default.
- W2105575298 modified "2023-10-02" @default.
- W2105575298 title "Behavior of primary radicals during thermal degradation of poly(methyl methacrylate)" @default.
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- W2105575298 doi "https://doi.org/10.1016/0141-3910(89)90007-4" @default.
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