Co3O4 纳米粒子的表面改性及其对复合材料性能的影响

Co₃O₄纳米粒子填充耐高温有机硅树脂复合材料,可用来制备耐高温热流传感器表面的吸收热辐射材料。Co₃O₄粒子表面采用接枝处理的方法接枝上甲基丙烯酸丁酯来改善纳米粒子与有机树脂的界面性能和防止粒子间的相互团聚。采用红外分析和热失重分析的方法研究了接枝状态和接枝率。Co₃O₄纳米粒子的表面处理对复合材料界面性能、吸热性能和耐热性能的影响通过透射电镜(TEM)、热流传感器的校正试验、热失重分析(TGA)和热失重的微分曲线(DTG)进行了研究。结果发现,Co₃O₄粒子的表面处理提高了其在有机硅树脂中的分散性能,同时提高热流传感器的热流灵敏度。未改性纳米Co₃O₄粒子的加入降低硅树脂的耐热性;经表面改性的Co₃O₄粒子的加入,提高硅树脂的耐热性。 

EFFECTS OF SURFACE TREATMENT OF CO3O4 NANO-PARTICLES ON THE PROPERTIES OF THEIR NANOCOMPOSITES

The heat-resistant silicone resin was filled with Co_3O_4 nanometer particles to prepare composites to absorb the heat radiation, which was coated on the heat flow transducer. To improve the interfacial properties between Co_3O_4 particles and the matrix resin and to prevent the nano-particles aggregating, the surfaces of Co_3O_4 particles were treated by grafting BMA on them. The grafting characteristics and graft ratio were investigated using infrared (IR) and thermogravimetric analysis (TGA). The effects of the surface treatment of Co_3O_4 particles on the interfacial, endothermal and thermal properties of the composites were analyzed using TEM, the calibrating test of the heat flow transducer, TGA and differential thermogravimetric analysis (DTG). It is found that the surface treatment of Co_3O_4 particles improves their dispersibility in silicone resin, and the response rate of the transducer is also improved greatly. The untreated Co_3O_4 particles deteriorate the thermal properties of the silicone resin. However, after surface treating of Co_3O_4 particles, its thermal properties are improved.