It is important to modify internal structure of nanofibers in order to increase the mechanical properties. We aim to control the internal structure by changing spinning conditions in free surface electrospinning. In this study, effects of electrical conductivity of polymer solution and spinning distance on internal structure of PVA nanofibers were investigated. In order to change electrical conductivity, ionic salts were added into the solution for electrospinning. By increasing electrical conductivity and decreasing spinning distance, i.e. increasing electrostatic force to draw the polymer jet in electrospinning process, d-spacing of the (1 0 1) plane was found to decrease, i.e. packing of polymer chains was enhanced.
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