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采用不同碱处理浓度、处理时间对剑麻纤维(SF)进行表面改性,通过与聚丙烯树脂(PP)混合、塑炼、模压成型制备SF/PP木塑复合材料。研究了剑麻纤维(SF)表面的碱处理方法、含量对SF/PP木塑复合材料力学性能的影响,借助光学显微镜和扫描电子显微镜对SF纤维和复合材料的冲击断面进行微观结构分析。结果表明:碱处理能够提高SF/PP木塑复合材料的力学性能。在碱浓度为10%时,处理时间为4h,SF含量为20%时,冲击强度为15.78kJ.m-2达到最大值,弯曲强度和弯曲模量随着SF含量的增加出现增大的趋势。
Different concentrations of alkali and treatment time were used to modify sisal fiber (SF). SF / PP wood-plastic composites were prepared by mixing with polypropylene resin (PP), plasticizing and molding. The effects of alkali treatment method and content of sisal fiber (SF) on the mechanical properties of SF / PP WPC composites were studied. The microstructures of the impact cross section of SF fibers and composites were analyzed by optical microscopy and scanning electron microscopy. The results show that alkali treatment can improve the mechanical properties of SF / PP wood-plastic composites. When the alkali concentration is 10%, the treatment time is 4h, the impact strength is 15.78kJ · m-2 when the SF content is 20%, the flexural strength and flexural modulus increase with the increase of SF content .