Improvement of interfacial interaction in impregnated wood via grafting methyl methacrylate onto wood cell walls

Youming Dong*, Michael Altgen, Mikko Mäkelä, Lauri Rautkari, Mark Hughes, Jianzhang Li, Shifeng Zhang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Improving the interaction between the wood cell wall and a modifying agent is fundamental to enhancing the efficacy of wood modification. The extent of interaction is, nevertheless, difficult to evaluate due to the highly heterogeneous nature of the modified wood. In this study, methacryl groups were grafted onto the wood cell wall polymers, via the reaction between 2-isocyanatoethyl methacrylate (IEMA) and hydroxyl groups, to improve their compatibility and reactivity. Subsequently, methyl methacrylate (MMA) was introduced into methacrylated wood and copolymerized with the bonded methacryl groups. The distribution of IEMA and poly MMA (PMMA) in the wood cell walls was investigated by scanning electron microscopy (SEM) and confocal Raman microscopy. The results showed that MMA penetrated the wood cell walls and formed strong interfacial interaction, which was confirmed by confocal Raman microscopy combined with principal component analysis (PCA). With copolymerization, the highest anti-swelling efficiency (ASE) (57%) was achieved, because of the effect of methacrylation. Compared to the reference, the water resistance and hardness were significantly improved. In addition, the dynamic wettability was also altered largely due to copolymerization.

Original languageEnglish
JournalHolzforschung
DOIs
Publication statusAccepted/In press - 1 Jan 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • copolymerization
  • impregnated wood
  • interfacial interaction
  • principal component analysis (PCA)
  • Raman microscopy

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