Highly Aligned and Single-Layered Hollow Fibrous Membranes Prepared from Polyurethane and Silica Blends Through a Two-Fluid Coaxial Electrospun Process

摘要

Highly aligned, single-layered hollow fibrous membranes are prepared using two-fl uid 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 polymercomplex 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 fl ow-rate ratio (FRR i/o) increases because the inner fl ow 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.