用SiO_2和环氧基硅烷偶联剂对纳米TiO_2进行修饰合成功能化纳米TiO_2(sTiO_2-O),然后与聚丙烯/尼龙6共混物进行熔融共混制备了sTiO_2-O/PP/PA6纳米复合材料.通过拉伸、冲击等力学性能测试并结合扫描电镜对分散相尼龙6尺寸大小观察表明,由于功能化纳米粒子表面环氧基与PA6中氨基能发生化学反应,有效提高了两相的界面作用;少量纳米TiO_2的加入使分散相尼龙6尺寸大幅度减小,并使复合材料拉伸和冲击强度大幅度提高,由此表明功能化纳米TiO_2对不相容PP/PA6共混物具有良好的增容作用.
The nanometer-sized TiO_2 were firstly coated with a silica nanofilm and pretreated by silane coupling agent containing epoxy, and then blended with polypropylene(PP)/polyamide 6(PA6) blends.The compatibilizations of the functionalized-TiO_2 on the PP/PA6 blends were investigated by means of scanning electron microscopy(SEM).SEM observation shows the domain size of the dispersed PA6 phase significantly decreases with the addition of nanometer-sized TiO_2.Due to the epoxy-functionalized TiO_2 can react with amino group of PA6, a stronger interfacial adhesion between nanometer-sized TiO_2, PP and PA6 is obtained, which was confirmed by mechanical analysis.The improved mechanical properties and decreased dispersed PA6 domain indicate the nanometer-sized TiO_2 plays the role of coupling species between the two polymers.Therefore, a clear compatabilization effect is induced by nanometer-TiO_2 in the immiscible PP/PA6 blends.
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