填料增强回收聚丙烯基复合材料制备及性能

Preparation and Properties of Filler Reinforced Recycled Polypropylene Matrix Composite

以麦秸秆纤维(WSF)、无机填料(CaCO_3、粉煤灰)和回收聚丙烯(RPP)为原料,通过熔融共混和模压成型工艺制备了无机填料/WSF/RPP复合材料。研究了秸秆含量、无机填料种类及用量对复合材料力学性能、微观界面性能、吸水率以及热膨胀性能的影响。结果表明:无机填料与树脂基体之间的界面性能不佳,且随着无机填料用量的增加,复合材料的弯曲强度、弯曲模量均出现不同程度的降低。此外,添加CaCO_3和粉煤灰可显著降低复合材料的吸水率(WA)和线性热膨胀系数(LTEC),提高复合材料的尺寸稳定性。其中,当CaCO_3用量为25%时,复合材料的WA和LTEC值最低,分别为8.46%和40.4×10^(-6)℃^(-1)。

Inorganic filler/wheat straw/recycled polypropylene hybrid composite was prepared by melt-compounding and pressure molding with wheat straw fiber （WSF）, inorganic fillers （heavy calcium carbonate and fly ash） and recycled polypropylene （RPP） as raw materials. The effects of wheat straw fiber content, type and dosage of inorganic fillers on mechanical property, microstructure, water absorption and thermal expansion of composite were investigated. The results showed that the interfacial properties between the inorganic filler and the resin matrix were not good, and the flexural strength and modulus of composite decreased with the increase of the amount of inorganic filler. Furthermore, the addition of CaCO3 and fly ash significantly reduced the water absorption （WA） and linear thermal expansion coefficient （LTEC） , improved the dimensional stability of composite. And when the CaCO3 dosage was 25% , the WA and LTEC values of composite were the lowest, which were 8.46% and 40.4×10^-6℃^-1, respectively.