目的 以阔叶浆为原料制备改性微纤化纤维素，并将其用于增强丙烯腈-丁二烯-苯乙烯共聚物(ABS)。方法 采用共研磨的方式，以Ca(OH)2为研磨助剂和润胀剂，将阔叶浆解离成微纤化纤维素(MFC)，再经碳酸化和硬脂酸钠改性后制得硬脂酸钙包覆的微纤化纤维素(CS-MFC)。然后采用溶剂浇铸法将CS-MFC以不同比例添加到ABS中，经双螺杆混合挤出和硫化机压片后制得CS-MFC/ABS复合材料，测定MFC、CS-MFC和CS-MFC/ABS复合材料的性能。结果 氢氧化钙具有显著的助研磨作用，得到的CS-MFC中硬脂酸钙以物理吸附的方式包覆在MFC表面，水接触角由18.2°提升到72.3°。将CS-MFC添加到ABS基体中，当CS-MFC的质量分数为5%时，复合材料的拉伸强度达到38.0 MPa，增幅为15.5%;当CS-MFC的质量分数为10%时，复合材料的弹性模量达到1.72 GPa，增幅为5.5%;CS-MFC对ABS的热稳定性影响较小。结论 经共研磨及硬脂酸钠改性得到的CS-MFC能有效提升ABS的拉伸强度和弹性模量，有利于提高ABS的应用性能。

The work aims to prepare modified microfibrillated cellulose from broad-leaved pulp and use it to enhance acrylonitrile-butadiene-styrene (ABS). The broad-leaved pulp was dissociated into microfibrillated cellulose (MFC) by co-grinding with Ca (OH)2 as grinding aid and swelling agent, and then modified by carbonization and sodium stearate to obtain calcium stearate-coated microfibrillated cellulose (CS-MFC). Then, CS-MFC was added to ABS in different proportions by solvent casting method, and CS-MFC/ABS composites were prepared by twin-screw mixed extrusion and vulcanizing machine pressing method. The properties of MFC, CS-MFC and CS-MFC/ABS composites were measured. The calcium hydroxide had a significant grinding aid effect and the calcium stearate in the obtained CS-MFC was coated on the surface of MFC by physical adsorption, and the water contact angle increased from 18.2° to 72.3°. CS-MFC was added to the ABS matrix and when the addition amount of CS-MFC was 5%, the tensile strength of the composite reached 38.0 MPa, an increase of 15.5%. When the addition amount was 10%, the elastic modulus reached 1.72 GPa, an increase of 5.5%. CS-MFC had little effect on the thermal stability of ABS. The CS-MFC obtained by co-grinding and sodium stearate modification can effectively improve the tensile strength and elastic modulus of ABS, which is conducive to improving the application performance of ABS.