3 years ago

Influence of glutaraldehyde on the performance of a lignosulfonate/chitosan-based medium density fiberboard adhesive

Influence of glutaraldehyde on the performance of a lignosulfonate/chitosan-based medium density fiberboard adhesive
Bin Li, Bingnan Yuan, Minghui Guo, Yue Dong, Xiaodi Ji
A lignosulfonate/chitosan-based medium density fiberboard (MDF) adhesive has been prepared using glutaraldehyde as crosslinking agent. Optimization of glutaraldehyde/chitosan mass ratio was carried out based on characterization details involving MDFs’ mechanical and dimensional performances analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray diffraction. The addition of glutaraldehyde improved the mechanical properties of the MDF significantly, while it negatively affected the dimensional properties. The MDFs using lignosulfonate/chitosan-glutaraldehyde adhesives (LS/CS-Glu) with glutaraldehyde/chitosan mass ratios in the range of 0.25–0.75 fulfilled the Chinese national standard for MDF. Chitosan was crosslinked with self-polymerized glutaraldehyde through CN linkages which resulted in the reduction of the amide bonds and hydrogen bonds between chitosan and lignosulfonate. The proposed LS/CS-Glu adhesives can be a promising candidate for traditional MDF adhesives which contain formaldehyde. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 135, 45870.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.45870

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