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Maderas. Ciencia y tecnología

versão On-line ISSN 0718-221X


COUTO DA SILVA, Bruno; TREVISAN, Henrique  e  GARCIA, Rosilei Aparecida. Effect of the thermal modification and nano-ZnO impregnation on the deterioration of Caribbean pine wood. Maderas, Cienc. tecnol. [online]. 2020, vol.22, n.4, pp.569-576. ISSN 0718-221X.

This study aimed to investigate the effect of thermal modification and nano-zinc oxide (nano-ZnO) particle impregnation on the deterioration of Caribbean pine wood under field conditions. Samples were thermally-modified at various temperature levels (control, 180 °C, 200 °C, and 220 °C). Nano-ZnO impregnation was done with an aqueous solution at 1,5 % in an autoclave under two-steps of pressure and vacuum. Unmodified and thermally-modified, non-impregnated and nano-ZnO impregnated samples were exposed to deterioration for five months in field tests. A deterioration index was used to evaluate the health condition of the samples. The mass loss and occurrence of termite tunnels in percentage were also determined. The nano-ZnO impregnation improved the resistance of unmodified wood to field-deterioration. The thermal modification at 180oC, and 200ºC increased the wood deterioration and nano-ZnO impregnation did not improve their resistance. Unmodified and 220 ºC modified samples had a lower mass loss by xylophages than other thermal treatments regardless of the nanoparticle impregnation. The nano-ZnO impregnation decreases the occurrence of termite tunnels in unmodified, 200 ºC and 220 ºC-modified samples.

Palavras-chave : Deterioration index; mass loss; nano-zinc oxide particle; termite tunnels; wood deterioration..

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