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本研究通过从剑麻纤维(SF)中提取剑麻纤维素微晶,采用KH550对纤维素微晶进行表面改性,得到改性剑麻纤维素微晶(MSFCM),将不同含量的MSFCM与酚醛树脂(PF)熔融共混制备MSFCM/PF复合材料,采用DMA和定速式摩擦试验机分别研究不同MSFCM添加量对MSFCM/PF复合材料的力学性能、蠕变、应力松弛性能和摩擦学性能的影响,并采用扫描电镜(SEM)对复合材料的冲击断面和磨损面形貌进行分析。研究结果表明,当MSFCM加入量为6%时,复合材料的冲击强度提高了50.32%,添加量为4%的复合材料的弯曲强度和弯曲模量分别提高了31.37%和18.85%。MSFCM的加入也显著提高了MSFCM/PF复合材料的蠕变和应力松弛性能。当MSFCM加入量为6%时,复合材料的摩擦系数稳定在0.36~0.44之间,比未加MSFCM复合材料的体积磨损率降低了15%,摩擦磨损性能达到GB5763-2008要求。
In this study, the cellulose micro-crystals of sisal were extracted from sisal fiber (SF), and the surface of cellulose micro-crystals was modified by KH550 to obtain modified sisal cellulose microcrystals (MSFCM). MSFCM with different contents The mechanical properties, creep, stress relaxation and tribological properties of MSFCM / PF composites were investigated by melt blending PF and PF with DMA and constant velocity tribometer respectively. The impact cross section and wear surface morphology of the composites were analyzed by scanning electron microscopy (SEM). The results show that when the amount of MSFCM is 6%, the impact strength of composites increases by 50.32% and the flexural strength and flexural modulus of composites increase by 31.37% and 18.85% respectively when the amount of MSFCM is 6%. The addition of MSFCM also significantly improves the creep and stress relaxation properties of MSFCM / PF composites. When the amount of MSFCM added is 6%, the friction coefficient of the composites stabilized at 0.36 ~ 0.44, which was 15% lower than the volume loss without MSFCM composites, and the friction and wear properties reached the requirements of GB5763-2008.