| 초록 |
Poly(N-isopropylacrylamide) (PNIPAM) is a kind of hydrogel having their unique lower critical solution temperature (LCST) properties. Because of their unique LCST properties, PNIPAM has been widely studied as an actuator in temperature changing conditions. However, the weak mechanical properties of PNIPAM are obstacles to utilize. In this study, we prepared PNIPAM film having directional pores by using a Directional Melt Crystallization method. After that, we coat different thickness of poly(vinyl alcohol) on PNIPAM film to control the thickness of exposed PNIPAM phases. PDMS was infiltrated into the pores of PNIPAM, and the composite layers were fixed on the surface of a model substrate PU. Exposed PNIPAM phase was well controlled depending on the PVA coating thickness. By combining with PNIPAM and PDMS, the modulus of coating layers was enhanced. PNIPAM/PDMS composite coating layers show fast surface structural transition and changes in hydrophilicity depending on temperature. |
