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Highly Aligned and Single‐Layered Hollow Fibrous Membranes Prepared from Polyurethane and Silica Blends Through a Two‐Fluid Coaxial Electrospun Process
Author(s) -
Huang YunShao,
Kuo ChiChing,
Shu YaoChi,
Jang ShinCheng,
Tsen WenChin,
Chuang FuSheng,
Chen ChienChung
Publication year - 2014
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201300758
Subject(s) - materials science , spinning , membrane , electrospinning , polyurethane , fiber , composite material , polymer , monolayer , volumetric flow rate , coaxial , core (optical fiber) , polyethylene , modulus , chemical engineering , nanotechnology , chemistry , biochemistry , physics , engineering , quantum mechanics , electrical engineering
Highly aligned, single‐layered hollow fibrous membranes are prepared using two‐fluid coaxial electrospinning (ES). Polyethylene oxide (PEO) is used as the core, and polyurethane (PU) and blends of PU with silica (SiO 2 ) are used as the shell to extract the PEO. The effects of the polymer‐complex concentration, the ES parameters, and the SiO 2 blending ratio on the morphologies and mechanical properties of fibers are explored. Using an appropriate PU concentration and applied spinning voltage combination yields a high fiber‐alignment degree. The hollow fibrous average area increases as the inner‐to‐outer flow‐rate ratio (FRR i/o ) increases because the inner flow increases. When using a PU concentration of 13 wt%, a spinning voltage of 7 kV, and an FRR i/o of 0.8, along with blending 15% SiO 2 with PU, the fiber alignment of the PU/SiO 2 membranes is 95%. The Young's modulus indicates that adding SiO 2 enhances the mechanical properties, causing a monolayer hollow‐fiber assembly with interconnected fibers to form.