Superhydrophobic micro-nanofibers from PHBV-SiO2 biopolymer composites produced by electrospinning

Abstract Electrospinning is a relatively simple technique for producing continuous fibers of various sizes and morphologies. In this study, an intrinsically hydrophilic poly(3-hydroxybutarate- co -3-hydroxyvalerate) (PHBV) biopolymer strain was electrospun from solution under optimal processing conditions to produce bilayers beadless micro-fibers beaded nano-fibers. The fibrous mats produced the pure PHBV exhibited hydrophilicity with complete wetting. Incorporation polydimethylsiloxane (PDMS) treated silica into electrospinning solutions resulted in non-wetting state increased fiber roughness enhanced porosity; however, displayed high water droplet-adhesion. SiO 2 –incorporated were then stearic acid at activation temperature 80 °C. This treatment caused surface plasticization, creating tertiary hierarchical owing interaction chains polar carboxyl groups acid. Scanning electron microscopy used assess influence process parameters incorporation nanoparticles on morphology fibers; energy dispersive X-ray spectroscopy confirmed presence nanoparticles. Fourier transform infrared performed study concentrations. chemical between confirmed, while successfully incorporated concentrations up 4.5% by weight. plasticization altered thermal properties decrease crystalline fraction observed. modified micro-nano-fibrous composites showed very low droplet sticking, roll off angle approximately 4° static contact 155° achieved. Graphical