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Investigation of Stretch Ratio and Pre-Stress Condition on Electrospun Nanofibers for Composite Reinforcement

MEHMET S. DEMIRTAS, MRINAL C. SAHA

Abstract


In this study, we investigate stretching and pre-stress conditions during stabilization of electrospun nanofibers on mechanical properties of yarns. The nanofibers are produced from 10% polyacrylonitrile (PAN) in N, N-dimethylformamide (DMF) solution using an environmentally controlled electrospinning set-up. As-spun nanofibers are mechanically stretched at different stretch ratio (λ = 1-3) and subsequently stabilized at 260°C in air for 180 min. During stabilization the nanofibers were subjected to pre-stress in the range between 0-5 MPa. Fiber diameter distributions are investigated by scanning electron microscope (SEM) while tensile properties are measured by dynamic mechanical analyzer (DMA). It has been found that mechanical stretching significantly improved the tensile strength of both as-spun and stabilized nanofiber while decreasing average fiber diameter. Application of pre-stress during stabilization has significant effect on improving the mechanical properties of the nanofibrous yarns.


DOI
10.12783/asc2017/15344

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