Effects of action processes on wood modification: the in situ polymerization of epoxy monomers as an example

Guo, Dengkang; Yang, Sheng; Fu, Feng; Li, Gaiyun; Chu, Fuxiang

doi:10.1007/s00226-022-01424-8

Cited by 6 publications

(1 citation statement)

References 45 publications

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“…The wood obtained by using a 70% compression ratio and heat treatment at 190 °C showed 26% higher dimensional stability than compressed wood alone . Compared with physical methods, chemical modification − is a more permanent and effective strategy to improve dimensional stability. On the one hand, the amount of hydroxyl groups in the wood cell wall would be reduced by graft modification.…”

Section: Introductionmentioning

confidence: 99%

Cell Wall Modification Based on Combination Reagents to Improve Dimensional Stability of Wood with High Efficiency

Qiu,

Hu,

et al. 2024

J. Agric. Food Chem.

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Although γ-methacryloxypropyltrimethoxysilane (MPS) was proved to be an effective reagent for improving the dimensional stability of wood, a bottleneck in ASE value (around 50%) existed. The reason was that MPS with low polarity opened few hydrogen bonds in the amorphous region of cellulose, while these hydrogen bonds could be reopened by water. Therefore, citric acid (CA) is chosen to cooperate with MPS to further enhance the dimensional stability of wood. In this paper, MPS and CA were used to modify wood individually (MW and CW) or with different combinations, that is, one-step modification (M/CW) and twostep modification with MPS first (M-CW) or CA first (C-MW). CA and MPS concentrations were optimized at 5 wt%. The ASE value for M/CW was only 25.74% at a weight percent gain (WPG) of 6.43%, which was only 0.6 times to MW or 0.7 times to CW. For M-CW, the ASE value gradually decreased with the soaking cycles, from 65.64% at a WPG of 9.05% to 51.20%. The C-MW had the best dimensional stability, with the ASE value 75.35% at a WPG of 11.50%. Although it decreased during the first soaking cycle, it stabilized at 62.20% at last. SEM and EDS images showed that the polymer mainly distributed in cell walls and few in cell lumen in C-MW. Thus, the enhanced dimensional stability of C-MW could be explained by CA opening the hydrogen bonds in the amorphous region of cellulose first, which provided more binding sites for MPS.

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