Coaxial electrospinning represents a unique tool to which the effects of confinement and dynamic response can be explored on a multitude of materials. Here, polypropylene glycol (PPG) was confined in semi-elastic polymer sheaths at the micro- and nano-scale. At these scales, the role of interfacial interactions between the core liquid and polymer sheath become important. Thus, we have identified the orientation of PPG within the cores of the fibers via dielectric relaxation and Raman spectroscopy and have explored the roles of PPG molecular weight and fiber diameter. The results indicate that PPG becomes more extended as fiber size decreases. Physical descriptions and mechanistic discussions will be presented.

Induced alignment of core liquids by confinement from coaxial electrospinning

2019 Fall National Meeting

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