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    Author(s): Gamini P. Mendis; Sydney G. Weiss; Matthew Korey; Charles R. BoardmanMark Dietenberger; Jeffrey P. Youngblood; John A. Howarter
    Date: 2016
    Source: Green Materials
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: View PDF  (1.0 MB)

    Description

    Sustainable, non-halogenated flame retardants are desired for a variety of industry applications. Lignin, as an industrially processed wood derivative, has been examined as a potential sustainable flame retardant additive to polymer systems. Here, the lignin is phosphorylated using a pyridine-catalysed esterification reaction with diphenyl phosphoryl chloride to improve its char-forming abilities. The chemical modification of the lignin was characterized by nuclear magnetic resonance spectroscopy and showed the formation of phosphorylated structures on the lignin. The thermal decomposition profile and char-forming characteristics of the modified lignin and modified lignin-epoxy composites were investigated using thermogravimetry. The flammability performance of modified lignin-epoxy composites were tested using mass loss calorimetry. With the addition of 10% modified lignin, the peak heat release rate decreased by 40% and the total heat of combustion decreased by 20%. Scanning electron microscopy was used to investigate the char morphology of the post-flame test samples and showed closed cell foam structures.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Mendis, Gamini P.; Weiss, Sydney G.; Korey, Matthew; Boardman, Charles R.; Dietenberger, Mark; Youngblood, Jeffrey P.; Howarter, John A. 2016. Phosphorylated lignin as a halogen-free flame retardant additive for epoxy composites. Green Materials. 4(4): 150-159.

    Keywords

    composites, lignin, polymers

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