Gümüş nitrat içeren poliakrilonitril kompozit nanoliflerin geliştirilmesi

Nowadays polymer composite nanofiber materials including silver nano particles have been drawn attention due to their attractive properties which are used in several areas. Silver nitrate (AgNO3) loaded polymer composite nanofibers have been used in wound-healing application, filtering media, chemical and biological protective materials, industrial dust collection systems, air filters or water filters, photonic and electric sensors, artificial tissues, protectivetextiles etc.. Polyacrylonitrile (PAN) is one of the important engineering material that is used to produce synthetic nanofibers. PAN/Ag composite polymers provide opportunity to obtain functionally fibers due to their gained optical, mechanical, electrical, antibacterial properties. Also providing high specific surface area and high interpenetrating capacity, high electrical conductivity. Although various properties was obtained from silver nanoparticles embedded polymer composite, dispersion of the silver ion has great importance in the PAN/Ag nanofibers. The properties of these nano composites are related with the size, amount and dispersion quality of the silver nitrate nano particles that embedded into polyacrylonitrile matrix. There are different methods for obtaining a polymer composite matrix. The mechanical mixing of polymer solution and silver nano particles (AgNO3) is one of the easiest methods. Although its simplicity, this method has a major disadvantage that agglomeration of the silver nano particles. Also the homogeneous dispersion of the silver nano particles into the polymer matrix is quite difficult because of the high viscosity of the polymer solution. In chemical reduction method, the reduction of the silver salt could be done in the presence of a suitable stabilizer that required to obtain stable, monodispersed nanoparticles. Poly(N-vinylpyrrolidone) (PVP) is the one of the best stabilizer that used in this area. Owing to these disadvantages some recent methods that are based on in situ reduction of metal ions and in situ polymerization of monomers have drawn interest. In these methods, silver ions have been provided from metal salt that have been reduced into Ag0 in the polymeric matrix. Obtaining of the silver metallic nano particles could be done by different reduction methods such as chemical reduction using sodium borohydrate, heat treatment, reflux method, UV radiation, Xenon arc reduction etc. Electrospinnig is the most used technique among the researchers for the production of polymer fibers containing metal nano particles. In this thesis the effect of the loading different amounts of the silver nitrate into polymer composites, different dispersion methods, different ratio of PVP loading, the effect of the reduction methods were investigated on the mechanical, electrical properties and antibacterial efficiency of the composite nanofibers.