PLA对PBAT/木粉复合材料力学性能影响

Effects of PLA on the Mechanical Properties of PBAT/Wood Flour Composites

本文采用聚乳酸(PLA)、木粉、聚己二酸丁二醇/对苯二甲酸酯(PBAT),通过挤出/注塑成型制备PLA/PBAT/木粉复合材料。借助材料试验机等详细研究PLA含量对木塑复合材料力学性能(弯曲强度、拉伸强度和冲击强度)、吸水率的影响。结果表明随着PLA含量增加,木塑复合材料的弯曲性能和拉伸性能逐渐增加。当PLA含量达到66%时,与未添加PLA相比,木塑复合材料的弯曲强度和弯曲模量分别提高了95%和850%;拉伸强度仅提高了30.9%;木塑复合材料的冲击强度则随着PLA含量增加而下降。吸水试验表明PLA的加入可有效降低PBAT木塑复合材料的吸水率。

Polylactic acid(PLA),wood flour and polybutylene adipate/terephthalate(PBAT)were used to fabricate PLA/PBAT/wood flour composites using an extrusion/injection method.The influences of PLA on the mechanical properties and water absorption of PBAT/wood flour composites were studied through material testing machine.The results showed that the flexural and ensile proper-ties of PLA/PBAT/wood flour composites increased as PLA content increased.Compared with composites without PLA,PLA/PBAT/wood flour composites were increased by 95%and 850%at 66%PLA,respectively,whereas tensile strength was only elevated by 30.9%.Impact strength of PLA/PBAT/wood flour composites decreased as PLA content decreased,which was relevant to the rigidness of PLA.In addition,water absorption of PLA/PBAT/wood flour composites was further reduced due to the addition of PLA.