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Application of ESR spectroscopy to the kinetics of free radical polymerization of methyl methacrylate in bulk to high conversion

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Summary

The concentration of propagating radicals during the free radical polymerization of methyl methacrylate in bulk to high conversion at 60°C was determined — (1) by “in situ” measurements in the spectrometer, and (2) using a cryogenic quenching procedure. The radical concentration showed a sigmoidal relationship with polymerization time, and the conformation of the radical was different below and above the gel point of ca. 30% conversion. A value of kt=2.5 (±0.3)×107 1 mol−1 s−1 was obtained below the gel point. The variation in kt, without allowance for a decreasing efficiency factor (f), was determined over the entire conversion range.

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Authors and Affiliations

  1. Polymer and Radiation Group, Department of Chemistry, University of Queensland, 4067, Brisbane, Australia

    R. Wayne Garrett, David J. T. Hill, James H. O'Donnell, Peter J. Pomery & Catherine L. Winzor

Authors
  1. R. Wayne Garrett
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  2. David J. T. Hill
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  3. James H. O'Donnell
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  4. Peter J. Pomery
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  5. Catherine L. Winzor
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Wayne Garrett, R., Hill, D.J.T., O'Donnell, J.H. et al. Application of ESR spectroscopy to the kinetics of free radical polymerization of methyl methacrylate in bulk to high conversion. Polymer Bulletin 22, 611–616 (1989). https://doi.org/10.1007/BF00718942

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  • DOI: https://doi.org/10.1007/BF00718942

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