Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 2017

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: long-term water absorption

Sortuj według:

Ogranicz wyniki do:

The influence of a treatment process on the reaction to water of durable and water resistant wood/plastic composites

Hosseinihashemi S. K., Badritala A.

Drewno : prace naukowe, doniesienia, komunikaty

2017

vol. 60, nr 200

21--34

In this study, the effect of the treatment process on the decay resistance and water absorption behaviour of wood flour/polypropylene composites was investigated. Composites based on ZB-pretreated, ZB-treated-during-manufacturing, and untreated wood flour, polypropylene were exposed to the decay by the white-rot fungus (Trametes versicolor) for 14 weeks. The long-term water absorptions of samples were evaluated by immersing them in water at room temperature for several weeks, and water diffusion coefficients (WDC) were also calculated by evaluating the water absorption isotherms. The morphology of the composites was characterized using scanning electron microscopy (SEM). The results showed that the composite made with ZB-treated wood flour exhibited the same water absorption as the control composite; while the ZB-pretreated wood flour, produced the highest improvements in water absorption performance. The water absorption of WPCs increased after exposure to white- rot fungus, where the water absorption of the decayed UT-WPC, ZB-T-WPC, and ZB-PT-WPC specimens increased by 41.4%, 43.25%, and 36.7%, respectively compared to the undecayed UT-WPC, ZB-T-WPC, and ZB-PT-WPC specimens. The undecayed ZB- -treated sample and decayed ZB-pretreated composite exhibited the lowest and highest WDCs, respectively. The SEM micrographs revealed that the outer surface of the wood fibers were coated by some crystalline deposits of zinc borate. Much larger WDC values are observed from the ZB-pretreated and decayed composites when compared to the ZB-treated, control, and undecayed composites. The results of this study help to clarify the effect of T. versicolor on the dynamic moisture absorption process of WPCs impregnated with ZB.