Preparation of thermoresponsive core-shell nanoparticles with PNIPAM
발표자
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초록
내용
The structure and property of poly(N-isopropylacrylamide) (PNIPAM) known as a thermoresponsive polymer can be controllable by external stimuli such as temperature and pH.Due to its unique characteristics of PNIPAM,many studies have been tried to form polymeric nanoparticles combining PNIPAM with polystyrene (PS) for the applications of chemical delivery, catalyst, sensor and so on.In this work,core-shell polymeric nanoparticles were prepared through the seeded emulsion polymerization of a styrene monomer under the presence of PNIPAM particles.The notable feature of this process is that the transition of PNIPAM from hydrophilic to hydrophobic above 32 °C.This change to hydrophobicity promotes the binding between PS and PNIPAM in aqueous media.As a result,stable core-shell polymeric nanoparticles can be successfully achieved.Their morphology and size distribution were measured by scanning electron microscope(SEM),transmission electron microscope(TEM),and dynamic light scattering(DLS).