| 초록 |
Induction of pores in functional polymer thin films have long been a topic of interest. One of the simplest methods for the preparation of porous films is non-solvent vapor-induced phase separation (NVIPS), a process which involves condensation of water (or, more rarely, other non-solvnet) droplets, induced by the latent heat of evaporation of the casting solvent, onto the forming polymer film. The polymer solidifies around the water droplets, and, after the evaporation of water, pores are obtained. To date, almost all reports of this method involve random coil polymers. Herein, we present the use of NVIPS to obtain porous films from rigid-rod poly(p-phenyleneethynylene)s (PPEs). We show that changes in the sidechain structure have significant impact on pore-forming behavior, and that careful modulation of the polymer’s interfacial energy allows for the achievement of highly sensitive detection of explosive vapors without using exceedingly thin films. |
