Preparation a novel high performance glucose-based wood adhesive with hyperbranched cross-linked network by air oxidation
Heyang Zeng, Tao Jin, Senlei Shi, Li Liu, Hai‐Yang Guo, Linkun Xie, Xijuan Chai, Kaimeng Xu, Guanben Du, Lianpeng Zhang
Abstract
Utilizing biomass resources to develop environmentally friendly and sustainable adhesives, replacing traditional petroleum-based adhesives, has become an effective way to solve resource shortages and environmental pollution. Glucose, as the most widely distributed reducing monosaccharide in nature, has great potential to replace aldehyde-based adhesives in the production of artificial boards. In this study, G-PEI adhesive was prepared from glucose and PEI by one pot one-step method on the basis of air oxidation and Maillard reaction. The crosslinking mechanism between glucose and PEI was confirmed through detailed Fourier transform-infrared (FT-IR), 13C nuclear magnetic resonance (13C NMR), X-ray photoelectron spectroscopy (XPS), and liquid chromatography-mass spectrometry (LC-MS) analysis. The results showed that the improvement of G-PEI adhesive bonding properties was attributed to the formation of cross-linking network and the synergistic effect of covalent bond and hydrogen bond. As a biomass adhesive prepared without additional oxidant, the maximum wet strength in boiling water of wood-based panels prepared with G-PEI adhesive reaches 1.55 Mpa under the hot pressure condition of 200 °C. Even if the hot-pressing temperature drops to 160 °C, the wet shear strength in boiling water can still reach 0.67 MPa, which is better than relevant reports. This study revealed a method for the simple preparation of high performance wood adhesives by oxidizing glucose through air.