| 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, a polysiloxane solution was synthesized and then added to the polyol. Consequently, the sol-gel reaction and the polyurethane foaming process were simultaneously proceeded to produce an organic-inorganic hybrid foam. Polysiloxane with varying weight percent was added into the PU precursor solution, and the resulting foam structure was compared with a pure polyurethane foam by SEM. Thermal conductivity was measured by LFA. By considering the change of cell structure, the properties of the PU-silica hybrid foams were investigated and analyzed. |
