Abstract
Compatibilization between polyethylene(PE) and wood-flour was achieved by means of direct reactive extrusion of PE, wood-flour, maleic anhydride(MAH), co-monomer styrene(St) and dicumyl peroxide. Mechanical properties and heat distortion temperature(HDT) of the PE/wood-flour composites were tested, and impact cracking surfaces of the composites were observed via scanning electron microscope. Effect of St on reactive compatibilization of the composites was evaluated. Experimental results indicated that the anchoring strength of interface in the composites was obviously strengthened after St was added. Mechanical properties and HDT of the composites raised with increase of use level of St on the initial stage, and then gradually descended. When use level of St ran up to 1.5%, mechanical properties and HDT of the composites were best. At this moment, the mole ratio of St and MAH was approximately 1:1.
Highlights
Wood/plastics composite(WPC) has usually poor compatibility, and compatibilization on WPC can notably raise its property
Dealing with wood-flour via reaction with silane[1], titanate[2], acetic anhydride[3] and benzoyl chloride[4] can reduce polar disparity of wood and plastics, and improve compatibility between them. Macromolecular compatibilizers such as glycidyl methacrylate graft copolymer[5], maleic anhydride graft copolymer[6] and acrylic vinyl monomer copolymer[7] contain epoxy group, anhydride and carboxyl which can react with hydroxyl on wood-flour, and contain macromolecular chain which have favorable compatibility with resin, they have commendable compatibilization on WPC
Percent grafting of MAH on macromolecular chain was low because of complexity of reaction environment, hindering further improvement of WPC property
Summary
Wood/plastics composite(WPC) has usually poor compatibility, and compatibilization on WPC can notably raise its property. Dealing with wood-flour via reaction with silane[1], titanate[2], acetic anhydride[3] and benzoyl chloride[4] can reduce polar disparity of wood and plastics, and improve compatibility between them. Macromolecular compatibilizers such as glycidyl methacrylate graft copolymer[5], maleic anhydride graft copolymer[6] and acrylic vinyl monomer copolymer[7] contain epoxy group, anhydride and carboxyl which can react with hydroxyl on wood-flour, and contain macromolecular chain which have favorable compatibility with resin, they have commendable compatibilization on WPC. It was tried increasing percent grafting of MAH via adding co-monomer styrene(St) to improve compatibilization effect in the process of reaction compatibilization of polyethylene (PE)/wood-flour composites, and influence regular pattern of St dosage on composite property was discussed
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