期刊
HOLZFORSCHUNG
卷 67, 期 2, 页码 193-200出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/hf-2012-0071
关键词
extrusion; hot water extraction; hygroscopicity; wood plastic composites (WPC)
资金
- USDA Forest Service Research and Development Woody Biomass, Bioenergy, and Bioproducts Grant Program
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1237815] Funding Source: National Science Foundation
Undebarked ponderosa pine chips were treated by hot water extraction to modify the chemical composition. In the treated pine (TP), the mass was reduced by approximately 20%, and the extract was composed mainly of degradation products of hemicelluloses. Wood flour produced from TP and unextracted chips (untreated pine, UP) was blended with high-density polyethylene (HDPE) and polypropylene (PP) and was extruded into wood plastic composites (WPCs). Formulations for WPCs consisted of 58% pine, 32% plastic, and 10% other additives. WPC based on HDPE+TP and PP+TP absorbed 46-45% less water than did WPC based on HDPE+UP and PP+UP, respectively. Thickness swelling was reduced by 45-59%, respectively, after 2520 h of immersion. The diffusion constant decreased by approximately 36%. Evaluation of mechanical properties in flexure and tension mode indicated improvements in TP-WPC properties, although the data were not statistically significant in all cases. Results showed that debarking of ponderosa pine is not required for WPC production.
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