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以聚丙烯为基体,木粉为填料,采用机械共混、二次挤出共混和注塑成型方法制备不同木粉含量的PP/木粉复合材料,并且测定了PP/木粉复合材料的力学性能。实验结果表明:随着木粉用量的增加,复合材料拉伸强度逐渐增大;木粉用量为60%时,复合材料拉伸强度达到最大值36.04 MPa;木粉用量为80%时,复合材料拉伸强度降低到34.60 MPa。木粉的含量由20%增加到80%,复合材料弹性模量由579.12 MPa增加到869.80MPa,断裂伸长率从18.92%降低到7.39%,冲击强度由9.33 kJ/m2降低到7.76 kJ/m2。这是因为PP/木粉复合材料体系中随着木粉含量的增加,木粉起到了应力集中的作用,使材料变脆,冲击强度降低。
PP / wood flour composites with different wood flour contents were prepared by mechanical blending, secondary extrusion blending and injection molding using polypropylene as substrate and wood flour as filler. The mechanical properties of PP / wood flour composites . The experimental results show that the tensile strength of composites increases with the increasing of the amount of wood flour, the tensile strength reaches 36.04 MPa when the amount of wood flour is 60%, the maximum of 36.04 MPa when the amount of wood flour is 80% Tensile strength reduced to 34.60 MPa. The content of wood flour increased from 20% to 80%, the elastic modulus increased from 579.12 MPa to 869.80 MPa, the elongation at break decreased from 18.92% to 7.39%, the impact strength decreased from 9.33 kJ / m2 to 7.76 kJ / m2 . This is because with the increase of wood flour content in PP / wood flour composite system, wood flour plays a role of stress concentration, making the material brittle and the impact strength reduced.