| 초록 |
Sustainable and energy-free materials for the cooling systems of artificial sweating mechanism are attractive research focus, because the current cooling systems require a lot of energy. The previous studies on the composites of poly(N-isopropylacrylamide) (PNIPAm) for artificial sweating have shown advantages from its unique lower critical solution temperature (LCST) behavior of rapid deswelling. The rapid deswelling was expected to maximize cooling effect, but the low heat transfer rates of the composites interfered with cooling. In here, we use polyurethane (PU) containing thermal conductive fillers for PNIPAm composites. PU film was first prepared by directional melt crystallization with aluminum nitride for better thermal conduction. Then, PNIPAm hydrogel was infiltrated into the porous PU film for swelling. A long-life cooling system could be constructed based on the materials. These cooling composites can be applied to buildings, automotive engines, thermoelectric devices, etc. |
