Plywood Adhesives by Blending Soy Protein Polymer with Phenol-Formaldehyde Resin
Blend adhesives were prepared from soy protein isolate (SPI) and phenol-formaldehyde (PF) resin. Thermal, rheological, and adhesion properties of the blend adhesives were studied. Adhesion properties were significantly affected by SPI/PF ratio and final pH value. Structure and thermal stability of the SPI were changed after blending with the PF resin. We hypothesize that the hydroxymethyl group of the PF reacted not only with itself but also with various functional groups of the SPI, including tyrosine, serine, threonine, asparagine, glutamine, and arginine. The reactions between the SPI and PF were greatly influenced by pH values. The blend adhesive (SPI/PF = 100/20) had the same level of adhesion strength as the commercial PF adhesive alone; this was attributed to the crosslinking reactions. The SPI/PF-blend adhesive had a much lower spread rate, compared with the commercial PF resin, indicating that less adhesive is needed to achieve the same adhesion properties. The SPI/PF-blend adhesive had 4.8 g/m2 of dry PF content per square meter of single glue line, compared with 70.6 g/m2 for the commercial PF resin, showing its environmental advantage.
Keywords: ADHESION STRENGTH; CROSSLINKING REACTION; PHENOL-FORMALDEHYDE; RHEOLOGICAL PROPERTIES; SOY PROTEIN ISOLATE; THERMAL PROPERTIES; WATER RESISTANCE
Document Type: Research Article
Publication date: 01 December 2007
- The goal of the creation of a biobased economy is challenging to agriculture, forestry, academia, government and industry. The extractable resources of the Earth are finite, regardless of the quibble over when they will be depleted. The economic, political and social demands for biobased chemicals, materials and energy are expected to radically transform the materials industries, particularly the plastics industry as well as the biofuel industry. These changes will be based on the principles of sustainability, eco-efficiency, industrial ecology, and green chemistry and engineering. In keeping with the growth of knowledge in this field, there is a strong need for a forum to share original research related to biobased materials and bioenergy. The Journal of Biobased Materials and Bioenergy (JBMB) has been created as an international peer-reviewed periodical to fulfill the need for communication in these research areas. This journal will encompass related research activities in all fields of science, engineering and the life sciences.
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