Electric Fibers That Contain Carbon Nanotubers

The development of anti-static and electric textiles is very necessary for textile industry. According to the application experiences in or out of our country, the polymer electric fibers which contain Carbon materials still have a large marketing.Because of their unique structure and extraordinary properties, Carbon Nanotubes (CNT) are particularly important for fundamental studies and industrial applications in the field of electronic devices, nano-circuit and reinforced & functional nanocomposites. Based on carbon nanotubes’ 1D structure and excellent electric properties, we prepared polypropylene / carbon nanotubes (PP/CNT) nanocomposites by twice blend with HAAKE rheometer and single screw, and the fibers were obtained using a conventional melt spinning processing technology. The structures and properties of PP/ CNT fibers were studied in this dissertation. The main conclusions are as follows:The studies of the PP/CNT nanocomposites’ electric properties showed that it was accordant with the theory about electricity percolation. Because of the unique 1D structure of CNT, compared with using Carbon Black (CB) as electric filled chips, the electric network could be formed with very low concentrations of CNT and the antistatic properties of nanocomposites could be improved efficiently. This study is particularly important for fundamental studies and real applications to choice electric filled chips and the best structural methods.The SEM images showed that CNT entwisted, transfixed with each other in the matrix, and formed network. Because of the addition of CNT could effect the nanocomposites’ high temperature stabilities, the decompose temperature of them increased with the increase of the CNT contents. The structure of the nanocomposites’ crystal was obversed with the host stage and DLI, and the non-isothermal caystalline behavior of them was studied by means of DSC. It was found that the crystallization rate of the composites increased as the addition of the CNT, the crystal form transferred too.The PP/CNT nanocomposite fibers were obtained by the method of traditional melt spinning processing, base on it, the structure and properties of the composite fibers were studied. Through the SEM, it was found that CNT did not distribut with single tube again, but uniformly dispersed in the form of congeries. At the same time, the CNT transpierced the surface of the fibers and have the opportunities to touch with the static charge, it was good for CNT to transfer the charge with the electric channels that formed inside the composite fibers.The volume resistance of the PP/CNT composite fibers decreased efficiently with the increase of the contents of CNT. The threshold concentration of CNT is about 1wt％. The 2D X-ray diffraction and sonic orientation tests showed that CNT oriented in the matrix by high-ratio-stretching. The tenacity and the broken elongation of the PP/CNT composite fiber decreased with the increased of CNT contents. For the same PP/CNT fibers, as a result of the increase of CNT contents, the tenacity and initial modulus rapidly increased and the broken elongation decreased efficiently. DMA test showed that the glass temperature, storage modulus and loss modulus of the nanocomposite fibers increased with the increase of the CNT contents.Bingdun Hong ( Material processing and engineering )Supervised by Huaping Wang...