Intercalated kaolin was prepared with two dimethyl sulfoxide (DMSO) as precursor, polyacrylonitrile(PAN)/K-DMSO nanocomposites was prepared by in situ polymerization with PAN and intercalated kaolin, and the fiber membranes of PAN/K-DMSO composite were prepared through electrostatic spinning technology. The microstructure and thermal properties of intercalation composites PAN/K-DMSO were studied by using XRD, FTIR, TEM and TGA. The micro-morphology and tensile strength of fiber membranes were characterized by SEM, POM and tensile testing machine. The results show that PAN/K-DMSO containing hydroxyl group peak which belong to the kaolin. The d001 layer spacing value of kaolinite increases with PAN into interlayer, and part of kaolinite is peeled and forms lamellar structure with thickness of 2~5nm dispersed in a polymer matrix. The heat resistance of PAN/K-DMSO composite is increased with the addition of K-DMSO. The diameter of PAN fiber membranes decreases and the tensile strength increases with the increase of K-DMSO.When the mass ratio of the PAN and K-DMSO is 8:1,the tensile strength is increased by 0.92,1.73MPa and 1.96MPa in untreated, cold pressing and heat treatment conditions, respectively,when compared with PAN.
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