Macroporous Polymer from Core−Shell Particle-Stabilized Pickering Emulsions
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文摘
Poly(styrene-co-N-isopropylacrylamide) (PS-co-PNIPAM) core−shell particles were synthesized and used as particulate emulsifiers in the preparation of particle-stabilized (Pickering) emulsions. Highly concentrated oil-in-water emulsions with an internal phase up to 80 vol % can be produced using PS-co-PNIPAM core−shell particles along as the emulsifiers in emulsions. The core−shell particles are adsorbed at the liquid interface, acting as a barrier against oil droplet coalescence. In addition, it is likely that excess particles simultaneously form a gel in the continuous phase to trap oil droplets in the gel matrix, in turn inhibiting creaming and phase inversion. Evaporation in air of such a core−shell particle-stabilized emulsion directly leads to porous membranes in the absence of chemical reactions. The pore walls of the final structures are densely packed with layers of the core−shell particles. This provides great flexibility to prepare functionalized porous materials for opening up new applications.