| 초록 |
Poly(N-isopropylacrylamide) (PNIPAm) has received attention because of unique soluble-insoluble change at its lower critical solution temperature. The transition rate of PNIPAm need to be accelerated because the current slow transition has made its applications difficult. In our previous study we developed thermo-responsive film, composed of PNIPAm hydrogels and polydimethylsiloxane (PDMS), could deswell to 10 % of its initial volume in 12 sec. To further improve deswelling rate, PNIPAm hydrogels having various pore sizes were prepared by directional melt crystallization and infiltrated PDMS into the pores of PNIPAm. 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 decreased. As a result, we demonstrated the transition rate of PNIPAm/PDMS composite could be controlled by PDMS phase in composites. |
