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SiC具有优异的力学与功能性能,作为增强相,在复合材料领域具有广阔的应用前景。采用双螺杆挤出、注塑成型方法制备了微-纳米SiC/聚丙烯(PP)复合材料。分别采用硅烷(KH-550)和钛酸酯(NDZ-201)两种偶联剂对微米(10μm)和纳米(50nm)SiC复合粉体进行表面处理,研究了偶联剂、SiC粉体粒度及添加量对SiC/PP复合材料的弯曲强度、冲击强度、弯曲模量、弹性模量和热变形温度的影响。结果表明,经KH-550/NDZ-201混合偶联剂改性的微-纳米SiC粉体共同增强PP材料的综合力学性能最好,其弯曲强度、冲击强度、弯曲模量、弹性模量和热变形温度比纯PP材料分别提高了40%,8.7%,141%,142%和33%。经钛酸酯改性的SiC/PP复合材料的力学性能优于硅烷和混合偶联剂(KH-550/NDZ-201)改性的SiC/PP复合材料。
SiC has excellent mechanical and functional properties, as a reinforcing phase, in the field of composite materials has broad application prospects. Micro-nano SiC / polypropylene (PP) composites were prepared by twin-screw extrusion and injection molding. The microstructure of the composite powders of micron (10μm) and nano (50nm) SiC were investigated by using silane coupling agent (KH-550) and titanate (NDZ-201) And the addition amount on the flexural strength, impact strength, flexural modulus, elastic modulus and heat distortion temperature of SiC / PP composites. The results show that the micro-nano SiC powder modified by KH-550 / NDZ-201 mixed coupling agent has the best comprehensive mechanical properties. The flexural strength, impact strength, flexural modulus, elastic modulus and Heat distortion temperature than pure PP material increased by 40%, 8.7%, 141%, 142% and 33%. The mechanical properties of titanate-modified SiC / PP composites are better than those of SiC / PP composites modified by silane and mixed coupling agent (KH-550 / NDZ-201).