用废木粉增强聚乙烯的研究

Study on Reinforcing Polyethylene with Waste Wood Flour

本研究采用废木粉为填料增强改性高密度聚乙烯。评价了马来酸酐接枝高密度聚乙烯(MAH-g-HDPE)对聚乙烯基木塑复合材料的增容效果,研究了木粉含量对复合材料力学性能和其它性能的影响,详细阐述了木粉的增强作用机理。研究结果表明:MAH-g-HDPE可显著增进憎水性基质和亲水性木粉之间的界面相互作用,明显改进复合材料的力学性能;在使用适当相容剂的情况下,木粉可明显提高聚乙烯的拉伸强度、弯曲强度和弯曲模量,具有良好的增强效果;当木粉含量为60％时,复合材料的拉伸强度、弯曲强度、弯曲模量分别高达38 MPa、54 MPa和3500 MPa,若与纯基质相比,分别提高了43．4％、176％和283％。这些实验结果表明,木粉对聚乙烯具有明显的增强效果。

In this paper,waste wood flour was used to reinforce high-density polyethylene （HDPE）. The compatibilizing effect of maleic anhydride grafted high-density polyethylene（MAH-g-HDPE） as a compatibilizing agent was evaluated, and the effects of wood flour content on mechanical properties of composite were investigated. The reinforcing mechanism of wood flour was elucidated in great detail. The experimental result shows： MAH-g-HDPE can enhance the chemical affinity between hydrophilic wood flour and hydrophobic polyethylene matrix and is able to improve the mechanical properties of composite; when MAH-g-HDPE as a compatibilizing agent is used, wood flour can increase the tensile strength, flexrrual strength and flexrual modulus of HDPE; when wood flour content is 60% by weight of the composite, the tensile strength, flexural strength and flexural modulus are up to 38MPa, 54MPa and 3500MPa respectively. If compared with pure PE matrix, they are increased by 43.4% , 176% and 283% respectively. Based on these results, it can be concluded that wood flour has obvious reinforcing effect on PE.