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采用剪切剥离法制备了无片层缺陷石墨烯(SEG),并以之为填料,通过简单的溶液共混法制备了共聚聚酰胺(CO-PA)/SEG纳米复合材料。原子力显微镜(AFM)和扫描电镜(SEM)测试结果显示,所制备的SEG是多片层石墨烯而非单片层石墨烯。X射线衍射(XRD)和偏光显微镜(POM)测试结果表明,SEG的引入能改变CO-PA的结晶性能,并使其晶型发生转变。热重分析(TG)与力学性能测试结果表明,当SEG含量较低时,CO-PA/SEG纳米复合材料具有较好的热稳定性和力学性能,明显优于纯CO-PA。这皆归因于无缺陷石墨烯SEG不但具有良好的热学和力学性能,而且能在CO-PA中得到良好的剥离和分散。
(SEG) was prepared by shear-and-strip method, and used as filler to prepare copolyamide (CO-PA) / SEG nanocomposites by simple solution blending method. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) test results show that the prepared SEG is multi-layer graphene rather than monolithic graphene. X-ray diffraction (XRD) and polarized light microscopy (POM) test results show that the introduction of SEG can change the crystalline properties of CO-PA, and make its crystalline transformation. Thermogravimetric analysis (TG) and mechanical properties test results show that the CO-PA / SEG nanocomposites have better thermal stability and mechanical properties at lower SEG content than pure CO-PA. This is due to the fact that the flawless graphene SEG not only has good thermal and mechanical properties, but also gives good stripping and dispersion in CO-PA.