| 초록 |
Electrospinning is a fascinating method for making micro and nano scale polymer fibers. If a secondary capillary is inserted into the main spinneret, we can produce core-shell fibers. Here we spin liquid crystal E55(BDH) cores inside polymer sheath solutions (based on polyvinylpyrrolidone - PVP) for making responsive composite fibers. In order to reduce the interfacial tension between the two fluids we add surfactant into either or both fluids. In case of ionic surfactants this also increases the solution conductivity, adding a tuning handle on the characteristics of the spun fibers. By varying type and amount of surfactant we can change the external and internal morphologies of the produced fibers, tuning from drop-wise to continuous core. We present a systematic study of the fiber morphologies, characterized using polarizing optical as well as electron microscopy and focused ion beam milling, as a function of fluid compositions and spinning conditions. |
