Abstract
The application of hydroxyl terminated polyethylene terephthalate (PET-OH) as a starting pre-polymer to react with polymeric methylene di-isocyanate (p-MDI) for synthesis of polyurethane as a wood-composite binder was studied. The PET-OH was modified from waste polyethylene terephthalate (PET) bottles by glycolysis reaction. The effect of weight ratios of binder and rubber-wood sawdust particles and the mole ratios of hydroxyl (OH) of PET-OH and isocyanate (NCO) of p-MDI on mechanical properties were investigated. The properties of wood-polymer composites from PET-OH were also compared with the polyurethane composites from polyethylene glycol (PEG) as a commercial polyol. It was found that mechanical properties of wood-polymer composites increased with the increase of binders and polyol contents and then decreased and PET-OH showed the greater properties than PEG. The ratio of wood particle and the binder of 60:40 by weight and the ratio of OH and NCO of 0.01:1 by mole gave the best mechanical properties.
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