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Cure and morphology of epoxy/polyester powder coatings containing titanium dioxide: a thermally stimulated discharge study

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Abstract

This article describes the use of thermally stimulated electrical discharge (TSD) measurements in the study of the cure processes occurring for a range of titanium dioxide, silica, and zinc oxide-pigmented epoxy polyester films. The unfilled polyester–epoxy resin system exhibits a simple TSD profile indicative of a combination of space charge and dipole relaxation processes. The addition of the Modaflow, which is used to aid in the dispersion of the pigment in the system, induces phase separation under certain cure conditions. In a number of systems, two lower temperature T g peaks were initially observed, which collapsed into a single peak on post cure. The principal difference between the two grades of titanium dioxide was the size of the space charge peak, which is a direct indication of the mobile ion content in the material. The sulfate has higher mobile ion content than the chloride route material. Differences were observed between traces of silica and zinc oxide, which reflect the ability of the particles to interact with the resin and form a dense matrix. Silica at low concentrations is able to reduce the space charge peak which implies it can trap ions. The TSD study indicates that the pigments are able to change the morphology of the matrix which is being formed.

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Acknowledgments

One of the authors (ECT) wishes to thank Tioxide and the EPSRC for maintenance during the course of this study.

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Authors and Affiliations

  1. WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow, G1 1Xl, UK

    Emile C. Trottier, Stanley Affrossman & Richard A. Pethrick

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  1. Emile C. Trottier
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  2. Stanley Affrossman
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  3. Richard A. Pethrick
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Correspondence to Richard A. Pethrick.

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Trottier, E.C., Affrossman, S. & Pethrick, R.A. Cure and morphology of epoxy/polyester powder coatings containing titanium dioxide: a thermally stimulated discharge study. J Coat Technol Res 9, 717–724 (2012). https://doi.org/10.1007/s11998-012-9410-1

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  • DOI: https://doi.org/10.1007/s11998-012-9410-1

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