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Laccase/TEMPO-modified lignin improved soy-protein-based adhesives: Adhesion performance and properties

Sarocha Pradyawong,Guangyan Qi,X. Sun,Donghai Wang

Published 2019 in International Journal of Adhesion and Adhesives

ABSTRACT

Abstract The aim of this study was to enhance the water resistance of soy protein (SP) adhesives using laccase/TEMPO-modified lignin. Kraft lignin was depolymerized by laccase enzyme in the presence of TEMPO to expand the oxidation reaction of both phenolic and non-phenolic compounds. This simplified process has the distinct advantage of enhancing lignin-protein interaction. Compared with SP adhesives, lignin-protein adhesives showed a stronger elastic modulus, higher thermal stability, and increased wet adhesion performance. Wet shear strength increased by 106% from 0.693 to 1.429 MPa, and partial wood failure was observed after the test. Better performance was also observed in the three-cycle soaking test. At the same time, the stronger interactions between -COO- and -NH2 groups of protein and lignin led to a decrease in flowability and spreadability.

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