Lignin blocking effects on weathering process of wood plastic composites

Darabi Peivand, Naghi Karimi Ali, Ahmade Mirshokraie Seyed, Thévenon Marie-France. 2010. Lignin blocking effects on weathering process of wood plastic composites. In : 41st Annual Meeting of the International Research Group on Wood Protection, Biarritz, France, 9-13 May 2010. IRG. s.l. : s.n., 8 p. Annual Meeting of the International Research Group on Wood Protection. 41, Biarritz, France, 9 Mai 2010/13 Mai 2010.

Résumé : The weathering of wood-plastic composites (WPC) causes discoloration which affects their aesthetic aspects. It has been proved that these discolorations are due to lignin degradation. Effects of blocking the susceptible structure of lignin assessed by chemical treatment such as acetylation and methylation are reported in this study. Surface chemical change of wood plastic composite (WPC) formulations based on high density polyethylene (HDPE) were monitored by means of ATR FT-IR spectroscopy and colorimetry. According to the standard ASTM 2565, samples were placed in Atlas Xenon apparatus for 250 hrs and 2000 hrs. The results have shown that methylation and acetylation can photostabilize lignin in short period of times. ATR FT-IR spectra shown that, in long term, none of the treatments could protect lignin degradation, within wood flour. Methylation limited the depth of penetration of weathering and these samples have more lignin content compared to control samples.

Mots-clés Agrovoc : panneau dérivé du bois, bois, polychlorure de vinyle, lignine, Populus alba

Classification Agris : K50 - Technologie des produits forestiers

Auteurs et affiliations

• Darabi Peivand
• Naghi Karimi Ali, University of Karaj (IRN)
• Ahmade Mirshokraie Seyed, PNU (IRN)
• Thévenon Marie-France, CIRAD-PERSYST-UPR Bois tropicaux (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/561812/)

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