Open Access

ARTICLE

Bonding Mechanism of Bamboo Particleboards Made by Laccase Treatment

by Jin Wang¹, Weigang Zhang^2,*, Xiaowei Zhuang^1,*

1 Zhejiang Provincial Key Lab of Biological and Chemical Utilizing of Forest Resources, Zhejiang Forestry Academy, Hangzhou, 310023, China 2 School of Engineering, Zhejiang Agricultural and Forestry University, Hangzhou, 311300, China

* Corresponding Authors: Weigang Zhang. Email: ; Xiaowei Zhuang. Email:

(This article belongs to the Special Issue: Research and Innovations in Engineered Timber and Mass Timber Products for Sustainable Built-Environment)

Journal of Renewable Materials 2021, 9(3), 557-568. https://doi.org/10.32604/jrm.2021.013269

Received 31 July 2020; Accepted 15 October 2020; Issue published 14 January 2021

Abstract

Using 1–8 years bamboo as materials, the content of different chemical constituent was tested, and the reactive oxygen species (ROS) free radicals produced from laccase treated bamboo were detected by electron spin-resonance (ESR) spectroscope. The wet-process particleboard was made from laccase-treated bamboo by hot pressing and board mechanical properties including internal bond strength (IB), modulus of rupture (MOR) and thickness swelling (TS) after 2-hours water absorption were tested under different conditions. Results showed that laccase mainly catalyze the bamboo components and improved the bonding strength of laccase-treated boards. By ESR measurement on each single component such as milled bamboo lignin, xylan and pore cotton treated with laccase, it was proved that laccase helped the degradation of bamboo lignin to produce ROS free radicals and could not catalyze the oxidation of cellulose and hemicelluloses. A logarithmic function relationship was found between board mechanical properties and ROS free radical level. It is optimal to using 5-year-old bamboo for high efficient utilization. The laccase treatment improves the activity of bamboo particles participating in self-adhesion reaction.

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