Using controlled radiolysis of melamine to reinforce melamine‐urea‐formaldehyde resin impregnated wood

Abstract

The effect of electron beam (EB) irradiation (0 to 80 kGy) on the mechanical properties of melamine‐urea‐formaldehyde (MUF) impregnated wood prepared from Pinus sylvestris is investigated. The results of the compressive strength parallel to grain measurement demonstrate EB irradiation can enhance the mechanical properties of MUF impregnated wood, with optimal results achieved at 20 kGy. Additionally, the formaldehyde emission of impregnated wood has been significantly reduced. This enhancement is promoted by the dispersibility and crosslinking efficiency of melamine in the dealkylation stage under low‐dose irradiation. However, the deamination and the destruction of triazine ring becomes significant at higher irradiation dosage, resulting in deterioration of mechanical properties as demonstrated by Raman spectroscopy,13C‐NMR, and SEM.

Epoxy-Acrylic Polymer In-Situ Filling Cell Lumen and Bonding Cell Wall for Wood Reinforcement and Stabilization

“…Such wood plastic composites show poor conversion rate, high cost and poor interfacial compatibility due to their volatility and low polarity, which restrict the practical application of vinyl monomer modification. Meanwhile, another corresponding widely explored resin system is the aqueous aldehyde oligomers system, including phenol-formaldehyde (PF) resin, urea-formaldehyde resin and melamine-formaldehyde resin [ 11 , 12 , 13 , 14 , 15 ]. These oligomers formed crosslinked solid polymer networks through condensation polymerization with water as the carrier.…”

Urea‐glutaraldehyde‐formaldehyde resin with low formaldehyde emission and high flexibility: Structure and toughening mechanism

“…Melamine or phenol, for instance, has been introduced into UF resin to prepare melamine-ureaformaldehyde (MUF) and phenol-urea-formaldehyde (PUF) resin. [23,24] However, an increase in crosslinking density can be obtained for these resin and thus the impact toughness would be weakened. Therefore, it is still challenging to prepare UF resin with combined properties of high toughness/strength and low formaldehyde emissions.…”