నైరూప్య

Preparation of Polysiloxane Nano-Particles Containing Surface Reactive Groups for Further Functionalization

A. M. Elfadly, U. F. Kandil, A. Y. El-Naggar, M. A. Ebied and R. M. Abdrabou

Polysiloxane nano-particles containing surface reactive groups were synthesized and functionalized. The process involves two steps: emulsion co-polymerization of octamethylcyclo-tetrasiloxane and 1, 2, 3, 4-tetramethyl-1, 2, 3, 4-tetravinylcyclotetrasiloxane followed by thermal crosslinking. The crosslinking proceeds without consuming all the vinyl groups. The remaining vinyl groups contained in the nanopolymer were converted to epoxy groups using m-chloroper-benzoic acid, producing functionalized polysiloxane nano-particles. Characterization of nano polymeric siloxanes was carried out by TEM, TGA, GPC, FTIR, and 29Si and 13C solid state NMR. TEM images showed that the particles were globular with small particle size. TGA study of the nano-polymer indicated high thermal stability.