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Open Access A Highly Water-Resistant Soy-Based Bioadhesive with 1,4-Butanediol Diglycidyl Ether and its Application on Plywood

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The objective of this study was to use soybean meal and 1,4-butanediol diglycidyl ether (BDDE) to develop a highly water-resistant, soy-based bioadhesive for plywood fabrication. The physical properties and performance characteristics of the resulting adhesive, including solid content, viscosity, water resistance, crystallinity, fracture morphology, thermal behavior, and cracks, were evaluated. The proposed adhesive was compared against the traditional soy adhesive with polyamidoamine-epichlorohydrin (PAE). Results showed that adding 8 g of BDDE into the adhesive formulation improved the solid content up to 32.83% and reduced the viscosity to 27340 mPa┬Ěs. The wet shear strength of plywood bonded with the adhesive was improved by 417% to 1.19 MPa, which was 17.8% higher than that of the PAE adhesive. BDDE effectively reacts with soy protein to form a dense network, thus enhancing the water resistance of the adhesive by creating a smooth and compact fracture surface that prevents moisture intrusion. The adhesive with BDDE was also found to be tougher after curing than the adhesive with PAE, which reduced the interior force of the adhesive layer and further enhanced its water resistance.

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Keywords: 1,4-BUTANEDIOL DIGLYCIDYL ETHER; PLYWOOD; SOYBEAN MEAL; TOUGHNESS; WET SHEAR STRENGTH

Document Type: Research Article

Publication date: 01 January 2017

This article was made available online on 08 April 2017 as a Fast Track article with title: "A Highly Water-Resistant Soy-Based Bioadhesive with 1,4-Butanediol Diglycidyl Ether and its Application on Plywood".

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  • The Journal of Renewable Materials (JRM) publishes high quality peer reviewed original research on macromolecules and additives obtained from renewable/biobased resources. Utilizing a multidisciplinary approach, JRM introduces cutting-edge research on biobased monomers, polymers, additives (both organic and inorganic), their blends and composites. It showcases both fundamental aspects and new applications for renewable materials. The fundamental theories and topics pertain to chemistry of biobased monomers, macromoners and polymers, their structure-property relationship, processing using sustainable methods, characterization (spectroscopic, morphological, thermal, mechanical, and rheological), bio and environmental degradation, and life cycle analysis. Demonstration of use of renewable materials and composites in applications including adhesives, bio and environmentally degradable structures, biomedicine, construction, electrical & electronics, mechanical, mendable and self-healing systems, optics, packaging, recycling, shape-memory, and stimulus responsive systems will be presented.
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