| 초록 |
Recently, cellulose nanocrystalline (CNC) has attracted a great deal of attentions as a green nanofiller to enhance the mechanical properties of polymers. However, the dispersion of CNC in a common organic solvent and hydrophobic polymer matrix was strongly restricted because of the intrinsic hydrophilicity of CNC, originated from abundance of surface hydroxyl groups. In this study, we prepared a hydrophobic CNC by grafting small hydrophobic molecules onto TEMPO-treated CNC. By observing that the surface-modified CNC exhibited a good dispersion in organic solvent with maintaining their fibrous structures, they were incorporated into polyurethane film by solvent casting. The optical and mechanical properties of the prepared CNC-polyurethane composites were examined by a number of techniques, which exhibited a better performance compared to the composites with un-modified CNC. |
