| 초록 |
Poly(N-isopropylacrylamide) (PNIPAm) has attracted attention because of its unique soluble-insoluble transformation at lower critical solution temperature. The transition rate of PNIPAm needs to be accelerated because the current slow transition has made its applications difficult. In our previous study, we developed thermo-responsive films, composed of PNIPAm hydrogels and polydimethylsiloxane (PDMS), could deswell to 10 % of its initial volume in 12 sec. To futher improve deswelling rate, PNIPAm film having various pore sizes were prepared by directional melt crystallization and infiltrated PDMS. We adjusted the pore sizes of PNIPAm by controlling the concentration of NIPAm solutions, and the content of PDMS phase in composites was controlled by the pore size of PNIPAm in turn. The deswelling rate increased as the pore size of PNIPAm increased. As a result, we demonstrated the transition rate of PNIPAm/PDMS composite could be controlled by PDMS phase in composites. |
