In Situ Thermal Preparation of Polyimide Nanocomposite Films Containing Functionalized Graphene Sheets
In Situ Thermal Preparation of Polyimide Nanocomposite Films Containing Functionalized Graphene Sheets
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DOI：
10.1021/am1008437
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发表时间：
2010-12-01
影响因子：
9.5
通讯作者：
Liu, Tianxi
中科院分区：
文献类型：
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作者：
Chen, Dan;Zhu, Hong;Liu, Tianxi
以N，N-二甲基甲酰胺为溶剂，对制备的高质量氧化石墨烯进行简单的超声处理，使氧化石墨烯(GO)剥离。通过将原始的聚酰胺酸(PAA)溶液与氧化石墨烯悬浮液高速混合，可以得到分散均匀的PAA溶液。制备的GO/PAA复合材料可通过原位部分还原和亚胺化制备不同功能化石墨烯载量的聚酰亚胺(PI)纳米复合薄膜。透射电子显微镜观察表明，FGS剥离良好，均匀分散在PI基质中。有趣的是，对于含有2wt%FGS的纳米复合薄膜，FGS沿表面方向高度排列。拉伸测试表明，FGS的加入显著提高了聚酰亚胺的力学性能，这是由于功能化的石墨烯纳米片具有高比表面积的良好分散性，以及FGS与基体之间良好的粘附性和互锁性。
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.