engleski

Study of the Wood Modification Process with Polycarboxylic Acid & Microwave Treatment

Wood specimens of fir (Abies alba Mill) and beech (Fagus sylvatica L.) are chemically modified by polycarboxylic acids (PCA) and analysed by Fourier transform infrared (FT-IR) spectroscopy that is used to evaluate the differences between convection and microwave curing. A new non-formaldehyde crosslinking system is composed of two most prominent PCAs, e.g. 1, 2, 3, 4-butanetetracarboxylic acid (BTCA) and citric acid (CA). These reagents require a phosphono-based catalyst, thus a sodium hypophosphite (SHP) catalyst is used in the study. The effects of the PCAs treatment are compared with the previously introduced 1, 3-dimethylol 4, 5-dihydroxy-ethylene urea (DMDHEU) treatment. Further intensification of the processes of wood modification and an increase in the quality of wood-based materials is achieved by microwave treatment. Dimensional stability of the modified wood is determined by anti-swelling efficiency (ASE), using the water soak/oven dry method. The results revealed the improvement of ASE of the wood modified by PCAs, as compared by the DMDHEU treatment.

chemical modification of wood ; BTCA ; CA ; microwave treatment ; FT-IR ; dimensional stability

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