| 초록 |
Polyurethane (PU) foam used as a thermal insulating material for buildings and transportation exhibits excellent thermal insulating property because of the existence of forming gas in the cell of the foam. In this work, the thermal insulation performance of PU foam can be improved by adding silica aerogel. Silica aerogel is light and has good thermal insulation per se. In order to improve the dispersibility of the silica aerogel as an additive, modification of the silica aerogel was performed. The modification was carried out through two processes. Silica aerogel with varying weight percent was added into the PU precursor solution, and the resulting foam structure was compared with silica particle composite foam and pure PU foam by SEM. Thermal conductivity was measured by LFA and compressive strength was comfirmed by UTM. By considering the change of cell structure, the properties of the PU-silica composite foams were investigated and analyzed. |
