Poliakrilonitril/karbon nanotüp kompozit nanolif özellikleri üzerine karbon nanotüp ve polianilin etkisi

PAN is the most widely used precursor for processing high performance fibers due to its combination of tensile and compressive properties as well as its high carbon yield. CNTs are ideal reinforcing materials for polymeric matrix. Some important interactions exist between PAN chains and CNTs and these ones lead to a higher orientation of PAN chains during the heating process. It was reported that the PAN macromolecular orientation increases with increasing CNT orientation in the polymer. Some difficulties must be overcome before producing a homogenous dispersion of CNTs in a polymer matrix, including modification for CNTs and processing methods for fabrication CNTs/polymer composites. Modification for CNTs may be succeed by lots of methods including the use of surfactants and chemical functionalization which has been shown to be effective in improving dispersion because the functional groups on the CNTs surface counteract the van der Waals attractive forces between CNTs and then enhance interaction of the matrix phase. Pristine and functionalized CNTs can be dispersed in a lot of polymer matrix systems. Among the conductive polymers, polyaniline (PANI) is widely used in polymer matrix to improve conductivity thanks to ıts low cost, ease of synthesis and good compability with other polymers. Nanofibres can be prepared from a polymer solution utilizing electrospining. Electrospinning is one of tools for preparation of nanofibers and also ıt provides a straightforward and cost-effective approach to produce fibers from polymer solutions or melts having various diameters. In this thesis, PAN-CNT and PAN-CNT-PANI composite fibers were produced. Characterization of composite nanofibers is made by FT-IR, DSC, XRD, SEM, tensile tester and conductivity meter. With the addion of PANI and CNT, tensile strength improved to 10.85 N/mm2 from 8.64 N/mm2. Also electrical conductivity and crystallization were improved with PANI and CNT.