Investigation of post-spinning stretching process on morphological, structural, and mechanical properties of electrospun polyacrylonitrile copolymer nanofibers

Preparation of aminated nanoporous nanofiber by solvent casting/porogen leaching technique and dye adsorption modeling

“…The disappearance of exothermic peak at higher CaCO 3 concentrations indicates that the cyclization reaction may cease to occur due to the interactions between PAN molecules and large quantities of CaCO 3 inhibitor. As a result, it can be concluded that the addition of CaCO 3 hinders the cyclization of PAN molecules in nitrogen environment [34] .…”

Mechanical and tribological properties of electrospun PA 6(3)T fiber mats

“…Although many experimental studies have been conducted on the mechanical properties of conventional nonwoven fabrics, there are a limited number of reports that account adequately for the observed mechanical properties of mats comprising electrospun nanofibers. In recent years several research groups have demonstrated significant improvements to the Young's modulus and yield stress of electrospun polymeric fiber mats by various forms of post-spinning techniques such as thermal annealing [13], mechanical drawing [14], hot pressing [15], and solvent vapor treatment [16].…”

Effects of chemical composition and post-spinning stretching process on the morphological, structural, and thermo-chemical properties of electrospun polyacrylonitrile copolymer precursor nanofibers

“…For example, the T300 carbon fibers with diameters of ~7 µm have the tensile strength of ~3.5 GPa; whereas the T1000 carbon fibers with diameters of ~5 µm have the tensile strength of ~7 GPa [9,10]. In recent years, the technique of electrospinning has been studied extensively as a convenient approach for the preparation of fibers with diameters typically being a few hundred nanometers (commonly known as electrospun nanofibers) [7,11,12].Electrospun PAN copolymer nanofibers are expected to be an innovative type of precursors for making continuous, nanoscale, and extremely strong carbon fibers due to the following reasons:(1) Unlike conventional spinning methods, the electrospinning method utilizes electrical forces to drive the spinning process and to produce the fibers [13,14], and an electrospinning jet/filament is usually elongated for several thousand times in a short time period of less than 50 ms [15]. This results in a huge elongation/draw rate that can effectively stretch macromolecules and closely align them along the fiber axis.…”