Preparation of Heat-Resistant, Electrically Conductive Polyacrylonitrile Films and Fibers by the Hydroxylamine/Hydrazine Pretreatment and Copper Sulfide Coating

초록

Methods to prepare heat-resistant, electrically conductive PAN films and fibers which maintain their electric conductivity at high temperatures have been studied. Modified PAN (tPAN) films which contained amino and hydroxyl groups and exhibited a high dimensional stability were obtained first by a pretreatment of PAN films with hydroxylamine (HA)/hydrazine solution. Then the tPAN films were coated with copper sulfide (CuS) in an aqueous solution of copper sulfate and sodium thiosulfate. Surface resistance tests of the CuS-tPAN films obtained at various conditions showed that they exhibited better electrical conductivity compared to CuS-PAN films. They maintained their electrical conductivity at temperatures above 200 degrees C, while CuS-PAN film did not Energy dispersive X-ray spectroscopy analysis revealed that the loss of electrical conductivity arose from the oxidation of the samples at high temperatures. Electrically conductive CuS-tPAN fibers with a flame retardant property were also prepared using the same method of HA/hydrazine pretreatment, followed by CuS coating.

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