Stimuli-responsive polymer nanoparticles are a significant class of smart materials were investigated extensively in recent years because of potential applications in different fields such as drug-delivery and gen-delivery systems. In this research, a temperature-responsive core-shell polymer nanoparticles (CSPs) by emulsion polymerization of styrene (hydrophobic shell) and dimethylaminoethyl methacrylate (hydrophilic core) was synthesized, which core crosslinked and shell grafted on its surface. Dynamic light scattering (DLS) was used to investigation of particle size and its distribution, and scanning electron microscopy (SEM) used for study of the morphology of core-shell nanoparticles. Obtained results showed that the CSPs have a size about 100 nm. The particle size of CSP was decreased by increasing of temperature above lower critical solution temperature (LCST) of the PDMAEMA. It is due to swelling of core with water below LSCT, and deswelling from water above LCST of the PDMAEMA.

Keywords