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

Hamerton, I, McNamara, LT, McNamara, LT, Howlin, BJ, Smith, PA, Cross, P and Ward, S (2014) Examining the kinetics of the thermal polymerization of commercial aromatic bis-benzoxazines Journal of Polymer Science, Part A: Polymer Chemistry, 52 (14). pp. 2068-2081.

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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. © 2014 Wiley Periodicals, Inc.

Item Type: Article
Authors :
AuthorsEmailORCID
Hamerton, IUNSPECIFIEDUNSPECIFIED
McNamara, LTUNSPECIFIEDUNSPECIFIED
McNamara, LTUNSPECIFIEDUNSPECIFIED
Howlin, BJUNSPECIFIEDUNSPECIFIED
Smith, PAUNSPECIFIEDUNSPECIFIED
Cross, PUNSPECIFIEDUNSPECIFIED
Ward, SUNSPECIFIEDUNSPECIFIED
Date : 15 July 2014
Identification Number : https://doi.org/10.1002/pola.27231
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 10:55
Last Modified : 28 Mar 2017 10:55
URI: http://epubs.surrey.ac.uk/id/eprint/808330

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