Effect of curing conditions on the water vapor sorption behavior of melamine formaldehyde resin and resin-modified wood

Michael Altgen*, Daniela Altgen, André Klüppel, Lauri Rautkari

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Impregnation modification of wood with melamine formaldehyde resin reduces the adverse effects caused by moisture uptake, but the underlying modes of action are not fully understood. The present study showed that it is crucial to understand the sorption behavior of the pure resin when interpreting the behavior of resin-modified wood. Furthermore, the applied heat-curing conditions had a significant effect on the moisture uptake of resin-modified wood. At the same resin loads, dry curing conditions were more effective in causing a cell wall bulking effect than wet curing conditions. This reduced the water-accessible cell wall pore volume in dry cured wood and counterbalanced the moisture uptake by the resin. Deuterium exchange measurements suggested that the occupancy of cell wall pores reduced the number of simultaneously active sorption sites. However, there was no evidence that a swelling restraint or reduced mechanical relaxation affected the water sorption of resin-modified wood significantly.

Original languageEnglish
Number of pages14
JournalJournal of Materials Science
Early online date18 May 2020
DOIs
Publication statusE-pub ahead of print - 18 May 2020
MoE publication typeA1 Journal article-refereed

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    Wood modification using pressurized hot water

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    Project: Academy of Finland: Other research funding

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