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(10 ìm)和纳米(50 nm) 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.
Micro-/nanosized SiC powders have excellent mechanical and functional properties, and have wide applications in the fields of composite materials as reinforcements. This paper reported the fabrication of micro-/nanosized SiC/PP composites through a process of melting extrusion and injection molding. The surfaces of micro-SiC and nano-SiC powders were modified by silane (KH-550), titanate (NDZ-201) coupling agents or their mixtures. The effects of the coupling agents and the mass fractions of SiC addition on the mechanical properties and heat deformation temperatures of the SiC/PP composites were investigated. As the results show, the overall properties of the micro-/nanosized SiC/PP composite are better than those of the PP composites filled with microsized SiC powders. Compared with that of the pure PP materials, the flexural strength, notched impact strength, flexural modulus, young's modulus, and the heat deformation temperature of the as-fabricated micro-/nanosized SiC/PP composites increased by 40%, 8.2%, 141%, 142% and 33%, respectively.
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