麦秸纤维增强聚丙烯复合材料的熔融流变性

Melt rheology of wheat straw fiber reinforced polypropylene composites

采用挤塑模压的方法制备麦秸纤维增强聚丙烯复合材料,研究了麦秸纤维添加量、尺寸及马来酸酐接枝聚丙烯(MAPP)添加量、温度对麦秸纤维增强聚丙烯复合材料熔融流变性的影响。麦秸纤维添加量从10 wt%增加至30 wt%时,复合材料的熔融黏度增加。马来酸酐接枝聚丙烯的加入提高了体系的流动性,熔融黏度降低。麦秸纤维以长纤维和纤维束作为增强材料时,复合材料的熔融黏度降低,以细小纤维作为增强材料时,复合材料的熔融黏度增加。温度由170℃升高至190℃,剪切速率由0.01 s-1增加至0.1 s-1时,麦秸纤维增强聚丙烯复合材料的黏度降低。

Wheat straw fiber-polypropylene（PP） composites were prepared by means of the extrusion and moulded pressing process.The effects of the wheat straw fiber content,fiber size,MAPP concentration,and temperature on the melt rheological properties of PP composites were investigated.Adding wheat straw fiber to polymer matrix can increase the melt viscosity of the PP composites.The introduction of MAPP to the system increases the flow behavior of polymer and decreases the melt viscosity.The longer the wheat straw fibers,the lower the melt viscosity,and the finer the wheat straw fibers,the higher the melt viscosity.The melt viscosity of the PP composites decreases with increasing temperature from 170℃ to 190℃,and increasing shear rate from 0.01 to 0.1 s-1.