| 초록 |
We have recently described how block copolymer as a structure-directing agent and organosilica interact to develop well-ordered 2-D hexagonal (p6mm) mesophase. With respect to potential applications such as catalyst, sensors, electronic and photonic devices, mesostructured silica in the form of thin films is profitable. In this study, mesostructured triblock/organosilica thin films with large characteristic length scales were prepared using poly(ethylene oxide)-poly(DL-lactic acid-co-glycolic acid)-poly(ethylene oxide) (PEO-PLGA-PEO) as a structure-directing agent and inorganic precursors such as MTES and BTESE. Sol-gel chemistry is employed to introduce inorganic components into a solution of PEO-PLGA-PEO for spin casting. Compared with solvent casting, spin coating is an effective method to prevent crack during the calcinations confirmed by OM. Based on the bulk phase diagram of PEO-PLGA-PEO triblock copolymer, volume fraction of block copolymer to silica is changed. And in order to develop well-defined mesostructured thin films, we find the optimum content of EtOH and aging time before spin casting. X-ray diffraction, small angle X-ray scattering and TEM were used for characterize pore size, pore structure and packing structure. |
