不饱和聚酯导电复合材料的制备与性能研究

【作者】 曾小平；

【导师】 应宗荣；

【作者基本信息】 南京理工大学 ， 材料学， 2004， 硕士

【摘要】 制备了以膨胀石墨(EG)为填料，不饱和聚酯(UPR)为基体的导电复合材料，并探讨了该复合材料的固化问题和浇铸成型工艺。运用SEM、XRD、TGA等手段研究了EG／UPR复合材料的微观结构、热性能、导电性和力学性能等。研究发现EG／UPR复合材料具有低填充高导电特性，其渗滤阀值很低，仅为2wt％。在渗滤阀值之前，EG对UPR有一定的增强增韧作用；复合材料的力学性能在渗滤阀值处发生突变，EG含量超过渗滤阀值之后，材料的力学性能开始下降。通过TGA分析发现EG的加入使材料的热稳定性略有增加。SEM观察发现EG在基体之中分散均匀，在EG含量为2wt％时，已经相互接触形成导电网络。 初步探讨制备了玻璃纤维(GF)增强EG／UPR复合材料，研究发现GF／EG／UPR材料具有优异的力学性能和较好的导电性能。更多还原

【Abstract】 Composites based on expanded graphite (EG) and unsaturated polyester resin (UPR) were prepared. Curing condition and casting processing technique of the composites were investigated. Electrical resistivity measurements at room temperature reveal that the value of threshold is only 2% by weight, which is much lower than that of conventional conducting composites. The volume electrical resistivity of EG/UPR composite at temperature reaches 106 Ω m when graphite content is 3.5% by weight.The mechanical properties of EG/UPR composites change abruptly in the vicinity of percolation threshold. When the EG content is lower than the threshold, EG particles show some reinforcing effect to the matrix; the mechanical properties decrease slightly when EG content is higher than the threshold. The thermal degradation behavior of the composites was studied by means of TGA, it shows that the thermal stability of composites is less higher than that of pure UPR. The SEM microphotographs turn out that EG particles are dispersed homogeneously in the matrix to form continuous conducting network when graphite content is 2.5% by weight. Glass fiber reinforced EG/UPR composites were also prepared and exhibited good comprehensive properties.更多还原