| 초록 |
The aim of this work was to enhance water vapor permeability of bio-polyurethane thin films, which is essential in non-microporous-type films for applications in breathable fabrics, by hybridizing with silica particles. As the bio-polyurethane, which was synthesized using biomass-based $Susterra^{(R)}$ 1,3-propanediol, did not have enough hydrophilicity for a breathable film, the hybridizing effect of hydrophilic nano- or micro-sized silica ( $SiO_2$ ) on the breathability of bio-polyurethane thin films was investigated by measuring the water contact angle and water vapor permeability of the films. It was found that the permeability of the bio-polyurethane film could be significantly enhanced by hybridizing with $nano-SiO_2$ as well as $micro-SiO_2$ . It was also observed that the $nano-SiO_2$ was more effective than the $micro-SiO_2$ in improving permeability. It was found that permeability in bio-polyurethane film could be improved up to more than 100% with $nano-SiO_2$ content at 9 wt%. |
