| 초록 |
Non-ionic block copolymers as templating material are effective to control pore geometry such as diameter and thickness. They also form a polymolecular micelle in the presence of oil or water in aqueous or hydrophobic organic solvent media. In the synthesis of inorganic mesoporous silica, hydrophobic swelling agent. for example, 1,3,5-trimethylbenzene(TMB) was often added to control the pore diameter by preferential solubilization in the micelle. When TMB is added to a symmetric non-ionic surfactant poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) [EO20PO70EO20, 20 and 70 are molar ratios of ethylene oxide (EO) and propylene oxide (PO) in a single polymer chain], a hexagonal nanoscopic ordering of micelles could be only observed at molar ratios of TMB / EO20PO70EO20 less than 0.2 - 0.3. With further increasing TMB in the mixture, a transition from the hexagonal cylindrical phase to the spherical mesocellular silica phase occurred. In the present study, we prepare D2O induced the reverse micellar structure of amphiphilic block copolymers in hydrophobic media. To explore the effect of D2O on the phase morphology of block copolymer micelles, small angle neutron scattering (SANS) technique is employed at various D2O / block copolymer molar ratios. Since the specific interaction between monomers and templating block copolymers is almost absent and, therefore, the morphology of the crosslinked polymeric resins is the same as that of block copolymer micelles in solution, the structural investigation on the micellar morphology in solution clearly provides the information on the morphology of the final cured polymeric resins.
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