偶联剂对SiO_2/CE复合材料热学及摩擦性能的影响

利用纳米SiO2对氰酸酯树脂(CE)进行改性,通过热失重分析(TGA)、摩擦磨损性能测试及扫描电镜(SEM)分析研究了纳米SiO2及其表面处理(分别选用小分子偶联剂KH-560和大分子偶联剂SEA-171)对纳米SiO2/CE复合材料热学及摩擦性能的影响,并初步探讨了其作用机理。结果表明,经SEA-171表面处理的纳米SiO2质量分数为3.0%时,其CE复合材料的热分解温度比纯CE树脂提高了将近75℃,摩擦系数降低了约25%,磨损率降低了77%。偶联剂的加入增加了纳米SiO2与CE树脂之间的界面粘结作用,因而复合材料的耐热性能和摩擦性能等得以提高。

Effect of coupling agent on the thermodynamics and friction performance of SiO2/CE composite material

Nanometer SiO2 was used to modify the cyanate ester resin(CE).The effect of nano-SiO2 and nano-SiO2 surface treated with small molecular coupling agent KH-560 and macromolecule SEA-171 respectively on the thermodynamics and friction performance of SiO2/CE composite material were studied by TGA,friction and wear property test and SEM analysis.The action mechanism was also discussed.The results showed that the thermal decomposition temperature of the SiO2/CE composite material with 3% nano-SiO2 surface treated with SEA-171 was increased by nearly 75 ℃ compared to the pure CE.The friction coefficient and wear rate was decreased by 25% and 77% respectively.The interfacial adhesion between nano-SiO2 and CE was improved by adding the couping agent,therefore the heat resistance and friction performance of the composite material were increased.