Examining the kinetics of the thermal polymerization of commercial aromatic bis-benzoxazines

Ian Hamerton*, Lisa T. McNamara, Brendan J. Howlin, Paul A. Smith, Paul Cross, Steven Ward

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

4 Citations (Scopus)

Abstract

Three commercial bis-benzoxazine monomers based on the aniline derivatives of bisphenol A (BA-a), bisphenol F (BF-a), and 3,3-thiodiphenol (BT-a) are examined using a variety of spectroscopic, chromatographic, and thermomechanical techniques. The kinetics of the polymerization of BA-a were found to be well described using an autocatalytic model for which values of n = 1.39 and m = 2.49 were obtained for the early and later stages of reaction respectively (activation energy = 81-88 kJ/mol.). Following recrystallization the same monomer yielded values of n = 1.80, m = 0.92, and Ea = 94-97 kJ/mol. BF-a and BT-a were also found to be well described using an autocatalytic model for which values of n = m = 2.11 (BF-a) and n = 2.10, m = 1.47 (BT-a) were obtained for the early and later stages of reaction (activation energy = 80-84 kJ/mol. for BF-a and 88-95 kJ/mol. for BT-a). The kinetic data are compared with parallel studies involving chemically initiated benzoxazine monomers. Molecular simulation is used to examine the rotational freedom of the central bridging units and this is related to the degree of conversion achieved.

Original languageEnglish
Pages (from-to)2068-2081
Number of pages14
JournalJournal of Polymer Science Part A: Polymer Chemistry
Volume52
Issue number14
DOIs
Publication statusPublished - 15 Jul 2014

Keywords

  • activation energy
  • computer modeling
  • crosslinking
  • high-temperature materials
  • kinetics (polym.)
  • polybenzoxazines
  • polymerization kinetics
  • Raman spectroscopy
  • thermal behavior

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