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Título : Hot water extracted wood fiber for production of wood plastic composites (WPCs)
Autor: Pelaez Samaniego, Manuel Raul
Palabras clave : Extrusion
Hot water extraction
Wood plastic composites (WPC)
Fecha de publicación : 1-feb-2013
Fecha de fin de embargo: 1-ene-2022
Tipo: Article
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.
URI : https://www.scopus.com/inward/record.uri?eid=2-s2.0-84873896858&doi=10.1515%2fhf-2012-0071&partnerID=40&md5=3d5473bde4c3ec4bca91a1fd7aab3b09
ISSN : 183830
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