The Mechanism to Improve the Dimensional Stability of Wood with Modification of Water-Soluble Vinyl Monomers

[Objective] Analyze the changes in the number of wood polar groups and cell wall structure before and after the modification of water-soluble vinyl monomers, and reveal the water-soluble 2-hydroxyethyl methacrylate (HEMA) and N-methylolacrylamide (NMA) The mechanism of improving the dimensional stability of modified wood by in-situ copolymerization provides a theoretical basis for the optimization and development of the modification technology. [Method] Dynamic water vapor adsorption and contact angle were used to characterize the number of polar groups of wood before and after modification with water-soluble vinyl monomers. And surface polarity changes, using scanning electron microscopy, Raman spectroscopy, X-ray diffraction, mercury intrusion method and nitrogen adsorption system to study the distribution of modifiers in wood, cell wall swelling, cell wall two-phase structure and pore changes. (Results) ]Under the environment of 0%-95% relative humidity, the equilibrium moisture content of HEMA and NMA mod