蒙脱土对环氧树脂微观结构及性能影响研究

以环氧树脂E53为研究对象,采用预剥离法制备出环氧树脂/蒙脱土纳米复合材料,并结合XRD、SEM及DMA等实验方法研究蒙脱土分散状态对环氧树脂的微观结构和性能影响.结果表明:在环氧树脂E53固化前,对蒙脱土进行预剥离处理有利于制备出剥离型环氧树脂/蒙脱土纳米复合材料;蒙脱土的加入,使环氧树脂/蒙脱土纳米复合材料的Tg比环氧树脂的升高5℃⁸℃,其储能模量及刚性随之增加;较低的β转变温度使其具有最好的低温韧性.对于剥离型环氧树脂/蒙脱土纳米复合材料,其均匀分散的无机纳米片层能有效地阻止裂纹的扩展,对材料起到了增强增韧效果.

Effect of Montmorillonite on Microstructure and Mechanical Properties of Epoxy Resin

The exfoliated epoxy resin /MMT nanocomposites were prepared by pre-exfoliated method,and the effect of montmorillonite on microstructure and mechanical properties of epoxy resin were studied by XRD,SEM and DMA. Experimental results showed that it's good for preparing exfoliated epoxy resin / MMT nanocomposites to pre-exfoliate montmorillonite before curing epoxy resin E53. Due to the addition of montmorillonite,the Tgof epoxy resin / MMT nanocomposites was about 5 ℃ 8℃,其储能模量及刚性随之增加;较低的β转变温度使其具有最好的低温韧性.对于剥离型环氧树脂/蒙脱土纳米复合材料,其均匀分散的无机纳米片层能有效地阻止裂纹的扩展,对材料起到了增强增韧效果.The exfoliated epoxy resin /MMT nanocomposites were prepared by pre-exfoliated method,and the effect of montmorillonite on microstructure and mechanical properties of epoxy resin were studied by XRD,SEM and DMA. Experimental results showed that it's good for preparing exfoliated epoxy resin / MMT nanocomposites to pre-exfoliate montmorillonite before curing epoxy resin E53. Due to the addition of montmorillonite,the Tgof epoxy resin / MMT nanocomposites was about 5 ℃ 8 ℃ higher than that of the epoxy resin. The storage modulus and stiffness of the epoxy resin increased with the increasing of Tg,and lower β transformation temperature made the best low temperature toughness. So exfoliated inorganic nanosheets can effectively prevent cracks along the exhibition,and play the role of reinforcing and toughening in epoxy resin / MMT nanocomposites.