表儿茶素修饰BN对BN@表儿茶素/环氧树脂复合材料性能的影响

用表儿茶素(EC)作为非共价改性剂,对BN进行表面处理,研究了不同质量分数EC修饰的BN对BN@EC/环氧树脂(EP)复合材料性能的影响。采用FTIR、 XRD、 SEM、 TG等对BN、 BN@EC和BN@EC/EP复合材料的结构和性能进行表征,研究证明EC对BN改性成功,且改性过程中没有对BN的晶型结构产生影响;经EC改性后的BN在树脂基体中的分散性得到改善;SEM测试结果表明,与未改性的BN粒子相比,经EC改性后的BN粒子的团聚程度降低, BN@EC在基体中的分散性更好;经改性的BN@EC在水中的稳定性得到提高;当EC质量分数为10wt%时, BN@EC/EP复合材料的导热性能最好,热导率达1.27 W·m^-1·K^-1,与BN/EP的热导率(0.62 W·m^-1·K^-1)相比提高了106%。最后,分析了EC的加入对复合材料热稳定性能和硬度的影响,结果表明, EC的加入会略微提高复合材料的热稳定性。

Effect of epicatechin modified BN on properties of BN@ epicatechin/epoxy resin composites

Epicatechin (EC) was used as a non-covalent modifier to treat BN. The effects of BN@EC with different mass fraction of EC on the properties of BN@EC/epoxy resin (EP) composites were investigated. BN, BN@EC and BN@EC/EP composites were characterized by FTIR, XRD, SEM, TG, et al. The results show that EC successfully modifies BN and doesn't affect the crystal structure of BN during the modification process; the dispersibility of BN modified by EC in the resin matrix is improved; the SEM test results show that the degree of agglomeration of BN particles modified by EC is lower than that of the unmodified BN particles. The dispersion of BN@EC in the matrix is better; the stability of the modified BN@EC in water is improved; when the EC mass fraction is 10wt%, the thermal conductivity of BN@EC/EP composite is best, which reaches 1.27 Wm-1K-1, which is 106% higher than the thermal conductivity of BN/EP(0.62 Wm-1K-1). Finally, the effects of the addition of EC on the thermal stability and hardness of the composites were analyzed. The results show that the addition of EC will slightly improve the thermal stability of the composites.