低热膨胀PVDF/PA11/SiC纳米复合材料的结构与性能研究

The Structure and Properties of PVDF/PA11/SiC Nanocomposites with Low Thermal Expansion Coefficient

具有高度尺寸稳定性的聚合物材料在众多领域有着广泛的应用前景.文章以PVDF/PA11共混物为基体、以纳米SiC为填料制备具有低热膨胀性的三元高分子纳米复合材料,系统研究了纳米SiC对PVDF/PA11共混物结构和性能的影响.结果表明:通过熔融共混制备的该三元复合体系具有独特的阶层式构造,在PVDF和PA11这两相结构中,纳米SiC只选择性地分散在PA11相中,而PVDF相中分散有少量PA11的纳米微区;同时,SiC的加入也可引起PVDF/PA11共混物结构的变化.尤为重要的是,纳米SiC能有效的降低共混物的热膨胀性能,提高材料的拉伸强度和拉伸模量.

The polymeric materials with high dimensional stability attract significant attention for the wide applications. The paper fabricated the ternary PVDF/PAll/SiC nanocomposites by melt compounding, and analyzed the influence of SiC to the structure and properties of PVDF/PAll/SiC nanocomposites. The results show that the ASP compound system has special hierarchical structure, and SiC exclusively locates in PAll phase, there are small quantity nanometer microzones of PAil in PVDF, meanwhile, the addition of SiC will cause the changes of the structure of the PVDF/PAll/SiC nanocomposites, it is particularly important that SiC can not only effectively decrease the thermal expansion property of the mixture, but also enhance the tensile strength and modulus of the material.