聚丙烯/木粉复合材料的增容改性及其机理

Compatibilizing Modification and Mechanism of PP/WF Composites

为进一步改善聚丙烯(PP)/木纤维(WF)复合材料的力学性能,采用几种不同类型的马来酸酐接枝型相容剂对PP/WF复合材料进行增容改性,并通过红外光谱和扫描电镜,分析和研究其增容机理。结果表明,PP-g-MAH的改性效果最为明显,当其添加量为m(PP-g-MAH)/m(WF)=10/100时,PP/WF复合材料的拉伸强度提高40.9%,弯曲强度提高47.3%,弯曲模量提高35.3%。PP-g-MAH使PP与木粉产生良好的增容效果,木粉颗粒被PP包裹,材料抵抗外应力以及材料破坏由发生在两相界面变成发生在材料整体,从而有效提高了复合材料的力学性能。

Three different maleic anhydride-grafted compatibilizers were used in this article for improving the mechanical properties of polypropylene（PP）/wood flour（WF） composites.The compatibilizing mechanism was then analysed and studied by Fourier transform infrared spectrum（FT-IR） and scanning electron microscope（SEM）. Results show that PP-g-maleic anhydride（MAH） has the greatest improvement on the effect of compatibilizing modification.Tensile strength increases by 40.9%,flexural strength increases by 47.3%,flexural modulus increases by 35.3% at 10/100 m（PP-g-MAH）/m（WF） ratio.The particles of wood flour are tightly encompassed by PP when PP-g-MAH is added that the failure is happened on the matrix,not the interface between PP and WF,so that the mechanical properties of PP/WF composites are effectively improved.