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, 1H NMR, and 13C 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.
|Number of pages||11|
|Journal||Journal of Polymer Science, Part A: Polymer Chemistry|
|Publication status||Published - 2002 Nov 1|
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry