碳化硅纳米粒子改性环氧树脂影响因素的研究

Study on the influence factors of SiC nanoparticles modified epoxy resins

通过先强力磁力搅拌再超声波分散的方式制备了均匀分散的碳化硅纳米粒子改性环氧树脂复合材料。采用X射线衍射仪、扫描电镜和透射电镜以及力学性能测试研究了强力磁力搅拌时间、超声波振荡时间和碳化硅纳米粒子添加量对复合材料性能的影响。结果表明：当强力磁力搅拌、超声波分散时间分别为2 h时,碳化硅纳米粒子的分散效果最佳,复合材料的拉伸强度和弯曲强度均为最大值。随着碳化硅纳米颗粒用量增加,复合材料的拉伸性能和弯曲性能都出现了先增加后减小的趋势。当碳化硅纳米颗粒的质量分数为2%时,材料的拉伸模量、弯曲强度、弯曲模量和弯曲应变达到了最大值1 390.7 MPa,110.53 MPa,3 269.4 MPa和6.62%,较纯环氧树脂分别提高了24.3%,36.8%,28.6%和30.1%。其质量分数为3%时,拉伸强度和断裂伸长率分别达到最大值70.51 MPa和5.09%,比纯环氧树脂提高了49%和20.3%。

The uniformly dispersed SiC nanoparticle modified epoxy resin were prepared by firstly magnetically stirring and then ultrasonically dispersing. The effects of strong magnetic stirring time,ultrasonic oscillation time and the amount of silicon carbide nanoparticles on the properties of the composites were investigated by the X-ray diffraction,scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and mechanical properties tests. The results indicated that the tensile properties and the flexural properties of the SiC nanoparticles/epoxy resin composites were increased firstly and then decreased with the increasing of SiC nanoparticles amount. When the mass fraction of SiC nanoparticles was 2 %,the tensile modulus,flexural strength,flexural modulus and bending strain of the material reached the maximum values of1 390. 7 MPa,110. 53 MPa,3 269. 4 MPa and 6. 62 %,respectively,increased by 24. 3 %,36. 8 %,28. 6 % and 30. 1 %compared with those of pure epoxy resins. When the mass fraction of SiC was 3 %,the tensile strength and elongation at break reached a maximum of 70. 51 MPa and 5. 09 %,respectively,increased by 49 % and 20. 3 % compared with those of pure epoxy resins.