| 초록 |
Monodisperse, nano-sized polystyrene-block-polybutadiene (PS-b-PB) block copolymer (BCP) colloidal particles with unique internal morphology were successfully prepared by SPG membrane emulsification. Systematic study on membrane emulsification process parameters for producing oil-in-water emulsion was performed. Using SPG membranes with three different pore size (1.1µm, 0.5µm, 0.2µm), uniform BCP particles with diameter comparable to that of the pore size was produced when ratio of the operation pressure (P) to critical pressure (Pc) was 1.33, independent of surfactant concentration. Moreover, internal nanostructure of the particle was controllable by varying particle size and amount of added homopolystyrene (hPS). Above certain weight fraction of hPS lead to morphology transition from onion-like to coiled cylinders, and decrease in particle size shows dramatic morphology change due to stronger degree of 3D confinement effect. |
