A combination of polv( diphenyl me thane diisocyanate)and stearic anhydride as a novel compatibilizer for wood-polyethylene composites

摘要

A combination of poly(diphenylmethane diisocyanate)(PMDI)and stearic anhydride was investigated as a new compatibilizer system for improving the interfacial adhesion between wood and polyethylene(PE).The treatment of wood flour with PMDI increased both the modulus-of-rupture(MOR)and the modulus-of-elasticity(MOE)of the resulting wood-PE composites.The combination of stearic anhydride and PMDI further increased both MOR and MOE of the resulting composites.Compared with the commercially used compatibilizer maleic-anhydride-grafted polyethylene(MAPE),the PMDI-stearic anhydride compatibilizer system resulted in significantly higher MOR and MOE.The moisture content of wood flour affected the compatibilization of both the PMDI-stearic anhydride compatibilizer system and MAPE.The compatibilization mechanisms of PMDI-stearic anhydride system were investigated in detail.Water-resistance tests indicated that the composites with the PMDI-stearic anhydride system were statistically more water-resistant than those with MAPE.