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- W2129140893 abstract "Abstract The bulk polymerization of methyl methacrylate initiated with 2‐pyrrolidinone and n ‐dodecyl mercaptan (R‐SH) has been explored. This polymerization system showed “living” characteristics; for example, the molecular weight of the resulting polymers increased with reaction time by gel permeation chromatographic analysis. Also, the polymer was characterized by Fourier transform infrared spectroscopy, 1 H NMR, and 13 C NMR techniques. The polymer end with the iniferter structures was found. By the initial‐rate method, the polymerization rate depended on [2‐pyrrolidinone] 1.0 and [R‐SH] 0 . Combining the structure analysis and the polymerization‐rate expression, a possible mechanism was proposed. n ‐Dodecyl mercaptan served dual roles—as a catalyst at low conversion and as a chain‐transfer agent at high conversion. Finally, the thermal properties were studied, and the glass‐transition temperature and thermal‐degradation temperature were, respectively, 25 and 80–100 °C higher than that of the azobisisobutyronitrile system. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3692–3702, 2002" @default.
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- W2129140893 date "2002-09-16" @default.
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- W2129140893 title "Polymerization of methyl methacrylate by 2-pyrrolidinone andn-dodecyl mercaptan" @default.
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