Synthesis and characterization of phenol-formaldehyde resin using enzymatic hydrolysis lignin

Enzymatic hydrolysis lignin (EHL) was utilized to partially replace phenol for preparing phenolformaldehyde (PF) resin. The influence of lignin substitution rate on the properties of the lignin-modified phenol-formaldehyde (LPF) resin was investigated. Lignin substitution of 60 wt% did not deteriorate the adhesive strength of PF resin. FTIR analysis of the resins revealed that the incorporation of EHL made no big difference in chemical structure, but led to a deteriorated thermal resistance. The comparison between LPF and bio-ethanol production residue-modified phenol-formaldehyde (RPF) resins elucidated that the purification process was beneficial for its higher substitution application and better performance of adhesive. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.