Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433, PR China.
ACS Appl Mater Interfaces. 2010 Dec;2(12):3702-8. doi: 10.1021/am1008437. Epub 2010 Nov 10.
Graphene oxides (GO) were exfoliated in N,N-dimethylformamide by simple sonication treatment of the as-prepared high quality graphite oxides. By high-speed mixing of the pristine poly(amic acid) (PAA) solution with graphene oxide suspension, PAA solutions containing uniformly dispersed GO can be obtained. Polyimide (PI) nanocomposite films with different loadings of functionalized graphene sheets (FGS) can be prepared by in situ partial reduction and imidization of the as-prepared GO/PAA composites. Transmission electron microscopy observations showed that the FGS were well exfoliated and uniformly dispersed in the PI matrix. It is interesting to find that the FGS were highly aligned along the surface direction for the nanocomposite film with 2 wt % FGS. Tensile tests indicated that the mechanical properties of polyimide were significantly enhanced by the incorporation of FGS, due to the fine dispersion of high specific surface area of functionalized graphene nanosheets and the good adhesion and interlocking between the FGS and the matrix.
氧化石墨烯（GO）通过对预先制备的高质量氧化石墨进行简单的超声处理在 N，N-二甲基甲酰胺中剥离。通过将原始聚（酰胺酸）（PAA）溶液与氧化石墨烯悬浮液高速混合，可以获得均匀分散有 GO 的 PAA 溶液。通过对制备的 GO/PAA 复合材料进行原位部分还原和亚胺化，可以制备具有不同功能化石墨烯片（FGS）负载的聚酰亚胺（PI）纳米复合材料薄膜。透射电子显微镜观察表明，FGS 在 PI 基体中得到了很好的剥离和均匀分散。有趣的是，对于含有 2wt%FGS 的纳米复合材料薄膜，FGS 沿着表面方向高度取向。拉伸试验表明，由于高比表面积的功能化石墨烯纳米片的良好分散以及 FGS 与基体之间的良好粘附和联锁，FGS 的加入显著提高了聚酰亚胺的力学性能。
