将纳米 Fe3 O4磁性颗粒加入由 PMDA 和ODA制备的PAA聚合物溶液中，通过静电纺丝法制备PAA/Fe3 O4复合纤维。利用扫描电镜(SEM)和透射电镜(TEM)对复合纳米纤维的微观形貌和 Fe3 O4在纤维中的分布进行了观察，采用 X 射线衍射仪(XRD)验证了Fe3 O4在复合纳米纤维中的存在，通过磁性实验分析了纳米复合材料的磁性能，同时使用红外光谱仪对纳米复合材料的化学结构进行了分析。结果表明，所制备PAA/Fe3 O4磁性纳米纤维成型良好， Fe3 O4磁性颗粒已分散在纤维中，与 PAA 是物理复合，材料具有一定磁性，为进一步制备聚酰亚胺磁性复合纳米纤维做了有益的探索研究。聚合物磁性复合材料由于其独特的物理化学性能及超顺磁性，有着广阔的应用前景。
The PMDA and ODA were used to prepare polyamic acid(PAA)solution and Fe3 O4 magnetic nanop-articles were added to the PAA solution containing the dispersant.The nanofibers of PAA/Fe3 O4 were prepared by electro-spinning.The microstructure of nanocomposite fibers and the distribution of magnetite (Fe3 O4 )nan-oparticles in fibers were characterized using scanning electron microscopy (SEM)and transmission electron mi-croscopy(TEM).And X-ray diffractometry(XRD)proved that Fe3 O4 nanoparticles existed in nanocomposite fi-bers.The magnetic properties of Fe3 O4 nanoparticles and nanocomposites were characterized using SQUID. Fourier transform infrared spectroscope (FT-IR)was used to analysis the chemical structures.The study showed that the morphology of the PAA/Fe3 O4 nanocomposite fibers was uniform and continuous,and Fe3 O4 nanoparticles were dispersed in the PAA solution by physical composite.The nanocomposite fibers showed a certain magnetic property.In this paper,some beneficial investigation were made for the preparation of polyim-ide magnetic nanocomposite fibers.Polymer nanocomposites have been extensively investigated for their poten-tial wide applications because of their unique physicochemical properties and superparamagnetic behavior.
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