Biomimetic galactomannan/bentonite/graphene oxide film with superior mechanical and fire retardant properties by borate cross-linking. (1st October 2020)

• Record Type: Journal Article
• Authors: Tao, Yuheng; Huang, Chen; Lai, Chenhuan; Huang, Caoxing; Yong, Qiang
• Is Part Of: Carbohydrate polymers. Volume 245(2020)
• Publication Date: 2020-10-01
• Subjects: Galactomannan -- Graphene oxide -- Bentonite -- In situ reduction -- Co-assembly; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116508
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Galactomannan (GM) from Sesbania cannabina was used to fabricate high-strength film. Bentonite and graphene oxide were used for reinforcement of GM-based films. Borate cross-linking reaction reinforced the strength of ternary nanocomposite film. GM-based nanocomposite films had excellent mechanical and fire retardant properties. Abstract: With the great demand for high-strength integrated materials in various industries, products from renewable resources were expected to replace petroleum-based materials. Inspired by the hierarchical structure of nacre, in this work, bentonite and graphene oxide (GO) were incorporated into the galactomannan (GM) matrix to prepare a ternary nanocomposite, which was further cross-linked and strengthened with borate. The chemical structure of the composite was analyzed with SEM, FTIR, XPS and XRD, revealing a co-assembly reaction between GO, bentonite and GM, accompanied by the borate crosslinking. This synergistic strengthen effect resulted in a composite possessing a maximum tensile stress and toughness of 231.16 MPa and 4.53 MJ/m 3, respectively, harder than most of the previously reported hemicellulose composites. Moreover, the nanocomposites showed excellent fire retardant property with a limiting oxygen index of 46.8 % due to the introduction of bentonite and GO, which shows potential application in fire-protective insulation, packaging and coating.