Non-linear coil shaped uniform fibers were synthesized with the blend solution of Poly (amide-coimide) PAI (torlon)/Poly (trimellitic anhydride chloride-co-4, 4'-methylene dianiline) (PTACM) in solvent mixing ratio of DMSO and THF (6:4) by using mechano-electrospinning. The linear shape and decrease in size of fiber was observed as the concentration of blend solution decreases from 30-27 %. However if concentration was reduced to 26 %, regular coil shaped uniform fibers were produced. We also found that solution prepared in 6:4 (DMSO/THF) and concentration less than 26 % did not facilitate continuous electrospinning. The properties of these blends were investigated using a rotational rheometer and SEM, in an attempt to understand the relationships between their rheological and morphological properties. It was concluded that concentration of solution played an important role to the diameter of fiber and significant impact on the shape of fiber.

In this study, the effect of phosphoric acid (PA) as a fiber spinning aid on the strength increase of polyacrylonitrile (PAN) nano-fibers by using modified mechano-electrospinning technologies has been analyzed. The medium carbonization temperature of 800°C has been selected for the future economic production of these new materials. The concentration of PAN in dimethyl sulfoxide (DMSO) was fixed as 5 wt%. The weight fraction of PA was selected as being 2%, 4%, 6%, and 8% in comparison to PAN. These solutions have been used to make the nanofibers. The mechano-electrospinning apparatus installed in KRICT was made by our own design. By using this apparatus the continous and highly aligned precursor nano-fibers have been obtained. The bundle of 50 well aligned nano diameter continuous fibers with the diametr of 10 microns with 6 wt% phosphoric acid for addition showed maximum mechanical properties of 1.6 GPa as tensile strength and 300 GPa as Young's modulus. The weight of final product can be increased 19%, which can improve the economical benefits for the application of these new materials.

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