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Exploiting colloidal interfaces to increase dispersion, performance, and pot-life in cellulose nanocrystal/waterborne epoxy compositesAuthor(s): Natalie Girouard; Gregory T. Schueneman; Meisha L. Shofner; J. Carson Meredith
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
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Discovery of Cellulose Nanocrystals as Pot-life Stabilizers for Epoxy Coatings
DescriptionIn this study, cellulose nanocrystals (CNCs) are incorporated into a waterborne epoxy resin following two processing protocols that vary by order of addition. The processing protocols produce different levels of CNC dispersion in the resulting composites. The more homogeneously dispersed composite has a higher storage modulus and work of fracture at temperatures less than the glass transition temperature. Some properties related to the component interactions, such as thermal degradation and moisture content, are similar for both composite systems. The mechanism of dispersion is probed with electrophoretic measurements and electron microscopy, and based on these results, it is hypothesized that CNC preaddition facilitates the formation of a CNC-coated epoxy droplet, promoting CNC dispersion and giving the epoxide droplets added electrostatic stability. The implication of these structural changes in polymer network formation results in an extension of the epoxy and crosslinker mixture's pot life by three orders of magnitude.
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CitationGirouard, Natalie; Schueneman, Gregory T.; Shofner, Meisha L.; Meredith, J. Carson. 2015. Exploiting colloidal interfaces to increase dispersion, performance, and pot-life in cellulose nanocrystal/waterborne epoxy composites. Polymer. 68: 111-121.
KeywordsInterfaces, Colloidal stability, Polymer nanocomposite, Cellulose
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