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EFFECT OF CHEMICAL COMPOSITION OF WOOD AND RESIN TYPE ON PROPERTIES OF PARTICLEBOARD

Bünyamin Sarı, Nadir Ayrilmis, Gökay Nemli, Mehmet Baharoğlu, Esat Gümüşkaya, Selahattin Bardak

Abstract


The effects of chemical composition of various wood species and resin type on the dimensional stability, mechanical properties, and formaldehyde emission of particleboard were investigated. Solubility’s of cold and hot water, NaOH, and alcohol-benzene, and amount of cellulose, α- cellulose, holocellulose, hemicelluloses and lignin, and acidity (pH) of were evaluated. Chemical compound of wood and resin type were the main parameters influencing physical and mechanical properties, and formaldehyde emission of particleboard. While high cellulose and α-cellulose content caused superior mechanical properties, high hemicelluloses content decreased the mechanical properties and increased the thickness swelling. Extractives dissolving in cold and hot water decreased the formaldehyde emission of particleboard. Hemicelluloses were found to be effective on the formaldehyde emission. High hemicelluloses content caused lower formaldehyde releasing. Extractives dissolving in the NaOH and alcohol-benzene positively affected the dimensional stability of particleboard panels. Resin type was found to be effective on all of the properties of particleboard. Particleboards produced with melamine-urea formaldehyde resin showed better quality properties and lower formaldehyde emission compared to the particleboards produced with urea-formaldehyde resin.


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