| 초록 |
Thermoresponsive hydrogels have been attracting attention in a variety of functional materials, because they exhibit a volume phase transition phenomenon near physiological temperatures. However, the slow kinetics and small volume shrinkage of bulk poly(N-isopropylacrylamide) (PNIPAAm) hydrogels upon heating greatly limit their practical application. Here, we propose a novel type of thermoresponsive hydrogels that show improved shrinking and re-swelling. By using globular structure of PNIPAAm in salt solution, it is possible to synthesize phase-separated hydrogels with ultrafast and large shrinkage than normal type of hydrogels. Furthermore, we incorporated simply synthesized nanogels in phase-separated hydrogels. As a result, hydrophilic and ionic nanogels effectively improved the kinetics of re-swelling. In this presentation, synthetic strategy of thermoresponsive hydrogels and improved kinetics of them will be discussed. |
