IR spectroscopic assessment of structural degradation of fiberboard after aging

 

S. A. Mamontov, Senior Lecturer; 

A. A. Mamontov, Senior Lecturer; 

O. A. Kiseleva, Cand.Tech.Sci., Associate Professor of the «KZiS» Department, FSBEI HE Tambov State Technical University, Tambov, Russia

 

Abstract. Often, the service life of wood composites is less than that stated by the manufacturer, which is due to insufficient knowledge of the degradation processes of polymer components of resin and wood filler under the influence of aggressive environmental factors. The task paper is to identify structural changes in the molecular structure of polymer substances included in the wood-fiber composite after thermal aging and UV irradiation using IR spectroscopy. IR spectra showed that under the influence of aging factors, free-radical rupture of hydrogen, hydrocarbon and ether bonds occurs in various functional groups of cellulose, hemicelluloses, lignin and resin. Thermal aging causes structural changes throughout the entire volume of the plate.  Artificial UV radiation destroys the surface layer with a thickness of about one millimeter. The detection of weak bonds in the molecular structure of the wood-fiber composite will help in the development of modern methods for increasing the resistance of wood composites to the action of operational factors.

Key words:fiberboard, thermal aging, UV irradiation, IR spectroscopy, bond destruction.