Polycarbosilane (PCS) solution was used to form PCS fibers by electrospinning and curing them by thermal process. The cured PCS fibers were then pyrolized under inert atmosphere to obtain silicon oxycarbide (SiOC) fibers. The PCS solution contained 1.2 g/mL PCS with 30% N, N-dimethylformamide (DMF)/70% toluene. The needle inner diameters used for spinning were 0.5 and 0.3 mm and variation for the applied voltage were 10, 12 and 14 kV. The electrospun PCS fibers were cured at 200°C in oxygen atmosphere for 1 hour and then pyrolyzed at 1000°C in inert atmosphere for 1 hour. Nonwoven SiOC fibers diameter ranging between 3 to 8 µm were analyzed by SEM and EDS. The oxygen embodied on the surface of cured PCS fibers arising during the curing process resulted in the SiOC fibers with larger diameters. Rapid solvent evaporation during the pyrolysis caused the SiOC fibers to have ribbon-shapes.

Synthesis and characterization of electrospun fiber chitosan/polyvinyl alcohol/polyvinylpyrrolidone have been studied. Electrospun fiber is a fiber produced from the electro spinning process that utilizes the power of electricity to produce polymer fibers with nano to micro diameters. The purpose of this study is to synthesis and characterize electrospun fiber from chitosan/polyvinyl alcohol/polyvinylpyrrolidone. The mixture of chitosan/polyvinyl alcohol/polyvinylpyrrolidone solution is placed in an electrospinning capillary with a diameter of 0.57 mm with an electrospinning voltage of 25 kV and a distance between the tip of the spinneret and the collector by 10 cm. The resulting electrospun fiber is analyzed with fourier transformed infrared spectroscopy and scanning electron microscopy. Based on the FTIR spectra, it was found that the electrospun fiber produced consisted of chitosan, polyvinyl alcohol and polyvinylpyrrolidone. SEM analysis results show that the electrospun fiber obtained has an average diameter of 93.1 - 168.7 nm.