Volume 137, Issue 1 47601
Article

Intumescent fire-retardant coatings for plastics based on poly(vinylphosphonic acid): Improving water resistance with comonomers

Katherine Williams

Katherine Williams

Institute for Materials Research and Innovation, University of Bolton, Deane Road, Bolton BL35AB, UK

Exova Warringtonfire, Holmsfield Rd, Warrington WA1 2D, UK

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John R. Ebdon

John R. Ebdon

Institute for Materials Research and Innovation, University of Bolton, Deane Road, Bolton BL35AB, UK

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Baljinder K. Kandola

Corresponding Author

Baljinder K. Kandola

Institute for Materials Research and Innovation, University of Bolton, Deane Road, Bolton BL35AB, UK

Correspondence to: B. K. Kandola (E-mail: [email protected])Search for more papers by this author
First published: 11 February 2019
Citations: 13

ABSTRACT

Coatings based on the in situ photopolymerization of vinyl phosphonic acid (VPA) with triallyl cyanurate as a crosslinking agent are shown to be effective not only for fire-protecting glass fiber-reinforced epoxy resin (GRE) composites but also poly(methyl methacrylate) (PMMA), a typical meltable and flammable thermoplastic. Dry adhesion of polyVPA coatings to PMMA surfaces is excellent but, as with coatings on GRE, adhesion following water-soak tests is poor. Copolymerizing VPA with more hydrophobic monomers improves wet adhesion, albeit with some impairment of fire performance, with copolymers of VPA and acrylonitrile giving the best results. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 47601.

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