MC尼龙6/纳米SiO2复合材料的合成

用原位聚合法制备MC尼龙6／纳米SiO2复合材料。当纳米SiO2的加入量为1％时，力学综合性能最优。与纯MC尼龙相比，拉伸强度提高21％，弯曲模量提高40．3％，简支梁冲击强度提高69．1％，断裂伸长率降低43％。随着纳米SiO2含量的增加，复合材料的力学性能呈现减小趋势。采用SEM、XRD对产物进行了表征，表明采用修饰后的纳米SiO2加入到产物中，粒子分布均匀，粒径分布窄，粒子的粒径在30nm左右。随着纳米SiO2加入量的增加，MC尼龙6／纳米SiO2复合材料的结晶度下降。

Preparation and Characterization of MC Nylon 6/SiO2 Nanocomposites

MC nylon 6/SiO2 nanocomposites in situ polymerization were prepared. Result shows that mechanical properties were the highest when nano - silica was 1%. Compared with pure MC nylon , the tesile strength, bend modulus, charpy impact strength increased 21%, 40.3 %, 69.1%, the elongation at break decreased 43 %. With the nano - silica content increasing, the mechanical properties decreased. The characteristics of nanocomposites were studied by SEM, XRD. The results indicates that the particles of silane treated silica were dispersed very well in the nanocomposites and their diameters were very similar, the inorganic particles were about 30 nm. With the nano-silica content increasing, the crystallization of MC nylon 6/SiO2 nanocomposites decreased.