| 초록 |
Amphiphilic block copolymer/silica mesostructures were synthesized by in an acidic sol-gel solution containing poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (PEO-b-PPO-b-PEO, PEO weight fraction of 30 %) as a structure directing agent. X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements confirmed that increasing the amount of TEOS with respect to PEO-b-PPO-b-PEO resulted in a various spectrum of morphology expected from the phase diagram of block copolymers with different lengths of block segments. At a molar ratio of TEOS / PEO-b-PPO-b-PEO of about 40, the mesostructure with a long range hexagonal ordering was synthesized and increasing the molar ratio to about 60 for TEOS / PEO-b-PPO-b-PEO results in a spherical-type morphology, due to the increased amount of the inorganic matrix molecules. This long range mesoscopic ordering was almost collapsed at higher and lower molar ratios. To explore the effect of water on the phase structure of block copolymer micelles in a hydrophobic organic reaction media, nanoporous polymer resins synthesized using reverse templates of amphiphilic block copolymers were also investigated using small angle neutron scattering (SANS) technique.
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