The Key Laboratory for Ultrafine Materials of The Ministry of Education, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
Nanotechnology. 2013 Jun 21;24(24):245702. doi: 10.1088/0957-4484/24/24/245702. Epub 2013 May 16.
In this study, poly(p-phenylene benzobisoxazole) (PBO)/graphene composites were prepared using PBO and poly(4,6-dihydroxymetaphenylenediamine terephthalamide) (PHA)-modified graphene oxide (GO-PHA). PHA is the precursor of PBO. GO-PHA was obtained via chemical coupling reaction of amino-terminated PHA and acyl-chloride-functionalized GO. Partially reduced graphene nanosheets and benzoxazole rings were formed after heating. GO-PHA could be stably dispersed in methane sulfonic acid (MSA), which facilitated its uniform distribution in the PBO matrix. The PBO/graphene nanocomposites were obtained by the dissolution of GO-PHA and PBO in MSA. The thermogravimetric analysis results showed that the PBO/graphene composites had good thermal stability below 400 ° C. The dielectric constant of the composites increased as the amount of GO-PHA increased, and the percolation threshold was f(c) = 0.037. The nanocomposite had a dielectric constant of 15.8, which was approximately five times larger than that of pure PBO polymer.
在这项研究中，使用 PBO 和聚（4,6-二羟基间苯二胺对苯二甲酰胺）（PHA）改性氧化石墨烯（GO-PHA）制备了聚对苯撑苯并双恶唑（PBO）/石墨烯复合材料。PHA 是 PBO 的前体。GO-PHA 是通过端氨基 PHA 和酰氯功能化 GO 的化学偶联反应获得的。加热后形成部分还原的石墨烯纳米片和苯并恶唑环。GO-PHA 可以在甲烷磺酸（MSA）中稳定分散，这有利于其在 PBO 基体中的均匀分布。通过将 GO-PHA 和 PBO 溶解在 MSA 中获得 PBO/石墨烯纳米复合材料。热重分析结果表明，PBO/石墨烯复合材料在 400°C 以下具有良好的热稳定性。复合材料的介电常数随着 GO-PHA 含量的增加而增加，渗流阈值为 f(c) = 0.037。该纳米复合材料的介电常数为 15.8，约为纯 PBO 聚合物的五倍。
