Abstract
Studies of polymer/carbon nanotube (CNT) fibers typically focus on optimizing the overall properties, and the effects of structural variation on these properties are ignored. Thus, we investigated the longitudinal variation in the properties of CNT/polyvinylidene fluoride (CNT/PVDF) fibers prepared by wet spinning a solution of multi-walled nanotubes, PVDF, and dimethylacetamide. To this end, materials for the CNT/PVDF fiber were selected, and a dope solution was prepared using MWNT, PVDF, and dimethylacetamide (DMAc). To consider the process parameters that would affect the performance of the CNT/PVDF fiber during the wet-spinning process using the dope solution, the initial conditions for wet spinning were selected, including bath concentration, bath temperature, drying temperature, and elongation, and the CNT/PVDF fiber was spun under the corresponding conditions. Additionally, three performance stabilization processes were proposed to improve the initial conditions for wet spinning and manufacturing the fiber. Lastly, to confirm the reliability of the CNT/PVDF fiber in all sections, tensile strength, electrical conductivity, and cross-sectional images were analyzed for the 30 m, 60 m, and 90 m sections of the fiber, and the reliability of the wet-spinning process was verified.
Highlights
Published: 22 November 2021Among the various nanomaterials, carbon nanotubes (CNTs) have high strength and conductivity
CNT fibers are mainly classified into two types: neat CNT fibers, which are composed of pure CNTs, and CNT composite fibers, which are composed of CNTs dispersed in a polymer [6,7]
Performance stabilization processes to ensure that the electrical and mechanical properties of CNT/PVDF fibers are homogenous with respect to the fiber length were developed
Summary
Carbon nanotubes (CNTs) have high strength and conductivity. 20% by carrying out a post-treatment process on CNT composite fibers prepared from a polyacrylonitrile (20%)/MWNT (0.75%)/dimethyl formamide (DMF) dope solution and investigated the influence of shear and elongational forces As shown by these studies, most research into the wet spinning of CNT composite fibers has focused on the manufacturing of fibers having a single improved physical property, such as the mechanical or electrical properties. After the CNT/PVDF fibers had been prepared using the selected initial spinning conditions, their performance was evaluated by analyzing the cross-sectional morphology, tensile strength, and electrical conductivity. To confirm the reliability of these stabilization processes over all fiber sections, cross-sections of the CNT/PVDF fiber specimens prepared using different process parameters were analyzed using scanning electron microscopy of sections obtained at 30, 60, and 90 m along the fiber length, and the tensile strength and electrical conductivity were calculated at these positions. On the basis of these results, the process reliability of the wet- spinning CNT/PVDF fibers was evaluated
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