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ATR-FTIR spectroscopic analysis of thermally modified wood degraded by rot fungi

Ozgenc O., Durmaz S., Hakki Boyaci I., Eksi-Kocak H.

Drewno : prace naukowe, doniesienia, komunikaty

2018

vol. 61, nr 201

91--105

The resistance of thermally modified oriental spruce, Scots pine, and oriental beech wood samples against fungi is investigated under different temperatures. Thermally modified wood samples are subjected to brown-rot fungi or white-rot fungi. In the control samples, 32-43% of the total mass losses are caused by fungal degradation, but only 0.47-0.78% was caused by the thermally modified wood samples. The changes in the wood cell walls main components, in the wood samples were analysed via attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The thermally modified and the control wood samples’ spectra after the decay test exhibit different intensities. Thermal modification increases wood’s resistance against decay by removing hemicellulose polymers from the wood cell wall. The resistance against the decay of thermally modified wood is quite high due to the loss of hemicellulose polymers in the wood cell wall. The thermally modified wood structure was also investigated via scanning electron microscopy (SEM) after decay testing. SEM images clearly elucidate that fungal degradation was not effective on the thermally modified wood samples. Conclusively, our study reveals that thermal modification improves some wood’s resistance in Turkey against fungal activity.

Weathering performance of a wood surface coated with acrylic resin containing UV absorber

Ozgenc O.

Drewno : prace naukowe, doniesienia, komunikaty

2017

vol. 60, nr 200

35--49

This study examines the effects of a 15-month natural weathering test (Uzungöl and Hıdırnebi Plateaus) on wood materials. In this study, samples of oriental beech (Fagus Orientalis L.) and Scots pine (Pinus sylvestris L.) with six different protection methods were used. The roughness increase, colour and visual- -macroscopic changes occurred on the surfaces of treated and untreated wood samples, exposed to outdoor conditions, were compared. The impregnation and heat-treated oriental beech and Scots pine were coated with acrylic resin containing UV absorbance. The results showed that the coating system increased the visual and physical performance of wood samples in outdoor conditions.