Photonic crystals in biology - NanoTR-VI

Poster Session, Thursday, June 17Theme F686 - N1123Analyzing The Effects Of Different Solvents On The Needle Electrospinning Of PolyurethaneNanofibersZerrin Yılmaz 1 , Oldrich Jirsak 2 , Nurcan Kurtoğlu 1 and Yasemin Korkmaz 1¹Textile Engineering Department, Engineering& Architecture Faculty, Kahramanmaras Sutcu Imam University, Campus of Avsar,46100, Kahramanmaras, Turkey²Nonwoven Department, Textile Engineering Faculty, Technical University of Liberec, Halkova 6, 46117, Czech RepublicAbstract: In this study, we investigated the effect of different solvents and tetraethylammoniumbromide (TEAB) salt on the spinnabilityof polyurethane nanofibers via needle electrospinning. Firstly, polymer of polyurethane in the fiber form was solved indimethylformamide (DMF) and dimethylacetamide (DMAA) by using 5% and 6% wt concentrations of polyurethane with TEAB andwithout TEAB salt. Then the fiber properties were examined. As result, the fiber diameter increased with TEAB+DMF solution;however, it decreased with TEAB+DMAA solution. It was also observed that viscosity increased with TEAB salt with both DMF andDMAA solvents.In the textile sector, fibers, yarns, fabrics, finishing,electronical textiles and fiber modifications arecomponents of nano technology applications [1].Polyurethanes are one of the most widely usedpolymers in biomedical, filtration, protective clothes,composites, sensor and wound healing applications.Therefore, it is very important to investigate thespinnability of polyurethane nanofibers [2].At this study, polyurethane (PU) in the fiber form wasused with 5% and 6% wt concentrations indimethylformamide (DMF) and dimethylacetamide(DMAA) solvents with tetraethylammoniumbromide(TEAB) and without TEAB salt. Ultrasonic bath wasused to solve the PU. Solution properties of conductivity,surface tension and viscosity were measured. Result ofviscosity are shown in figure 1.Figure 2: (a) 6% wt of PU nanofiber by using DMF with TEAB(b) 6% wt of PU nanofiber by using DMAA with TEABFigure 3: Diameter of PU nanofibers by using DMF with teaband without teab.Figure 1. Viscosity of Polyurethane at different solutions.Later, the SEM images of samples were compared toanalyze fiber properties of PU nanofibers. As seen inFigure 2-a, fibers are more regular than Figure 2-b.Fiber diameter increased with increasing theconcentration of TEAB salt with DMF which was alsoreported in the literature [2]. However, it decreased withTEAB+DMAA solution. (Fig. 3 and 4)Figure 4. Diameter of PU nanofibers by using DMAA with teaband without teab.This work was supported by Technical University ofLiberec. We thank to Nonwoven Department ofTextile Engineering Faculty in TUL.Corresponding author: zerrin-yilmaz@hotmail.com[1] E.Özdoğan, A.Demir and N. Seventekin; Nanotechnology and itsapplications in textile industry, Tekstil ve Konfeksiyon, 4/2006 225-229[2] F.Cengiz and O.Jirsak; The Effect of Salt on the RollerElectrospinning of Polyurethane Nanofibers; Fibers and Polymers2009, Vol.10, No.2, 177-1846th Nanoscience and Nanotechnology Conference, zmir, 2010 784