Preparation of hybrid microgels functionalized by silver nanoparticles

Hybrid microgels functionalized with silver nanoparticles (AgNP) have been prepared and their physico-chemical properties examined. Composite particles have been obtained by formation of AgNP in presence of poly[vinylcaprolactam-co-(acetoacetoxyethyI methacrylate)] (VCL/AAEM) microgel particles. It has been demonstrated that hybrid particles with different AgNP amounts can be prepared. Hybrid particles are sensitive to temperature and swelling, and collapse processes are reversible. Incorporation of AgNP leads to shrinkage of microgel template due to the partial immobilization of polymer chains on the microgel surface. As a consequence, gradual loss of temperature sensitivity is observed. Hybrid microgels form highly transparent well-organized films on solid substrates, providing homogeneous distribution of AgNP in bulk material. Presence of AgNP increases considerably the thermal stability of composite films.