Composite membranes composed of polymer (polycarbonate, PC)/liquid crystal [N-(4-ethoxybenzylidene)-4' ‘-butylaniline, EBBA]/crown ethers have been prepared. Crown-mediated K+ transport through the PC/EBBA/crown membranes was very fast above tkn(crystal-nematic liquid crystal phase transition temperature of EBBA) owing to the high fluidity of EBBA forming a continuous phase in the composite membranes. K+ transport was very slow below TKN where the therm38:150al molecular motion of EBBA is frozen. In particular, K+ transport is “completely” suppressed when the crown carriers form microheterogeneous, phase-separated aggregates in the membranes. This is the first example for “complete” thermocontrol of ion transport through the polymer composite membranes.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)