硅烷修饰对环氧树脂/纳米介孔MCM-41复合材料性能的影响

用偶联剂将纳米介孔MCM-41粉体修饰后与环氧树脂溶液共混,制备出环氧树脂/MCM-41纳米复合材料.研究了偶联剂的含量和不同溶剂的修饰对纳米介孔MCM-41粉体分散性和复合材料力学性能的影响.结果表明,加入适量的偶联剂和在极性较小的介质中修饰,可制备出单分散的纳米介孔MCM-41颗粒增强的新型网络复合材料.偶联剂中的有机基团-(CH2)3-NH2不仅进入孔道、修饰了MCM-41的孔壁,而且使介孔分子筛保持了有序的孔道结构.环氧树脂高分子链与偶联修饰后的MCM-41颗粒的内、外表面以强烈的化学键结合,使MCM-41颗粒均匀分散在聚合物基体中,提高了材料的力学性能,其拉伸强度比基体树脂提高了69%,杨氏模量提高了90%.

Effect of silane coupling agent modified MCM-41 on the properties of epoxy resin/nanosized mesoporous MCM-41 composites

A novel epoxyresin/MCM-41 nanocomposite modified by coupling agent was prepared by solution blending. The influences of the amount of coupling agent and the medium modification on the disperse properties and mechanical properties were investigated. The results showed that the novel nanonetwork composite with the monodisperse, nanosized mesoporous MCM-41 particle strenghened is prepared at the suitable amount of coupling agent and the suitable medium. -(CH2)3-NH2 group of silane coupling agent not only gets into the modified inner wall of mesoporous MCM-41,but also makes MCM-41 remain its ordered pore structure. Because the chain of epoxy resin links with the inner and outer of the modified MCM-41 through chemical bond, MCM-41 particle can disperse evenly in the matrix. Compared with the matrix, the tensile strength and the Young's modulus of the composites are improved by 69% and 90%, respectively,