A Versatile Method for Grafting Polymers on Nanoparticles

Abstract

We report a simple and versatile method for grafting polymers on nanoparticles. A procedure was developed for the synthesis and subsequent functionalization of silica nanoparticles with a perfluorophenylazide. Polymers were then grafted by the photochemically induced insertion reactions of the perfluorophenylnitrene. Polystyrene, poly(4-vinylpyridine), and poly(2-ethyl-2-oxazoline) were successfully grafted on silica nanoparticles. Grafting density was studied with regard to polymer concentration and molecular weight.

Microwave irradiated click reactions on silicon surfaces via derivertization of covalently grafted poly(PEGMA) brushes

“…This band is assigned to the asymmetric stretching mode of cumulated double bond of AN 3 [49]. It is approximately consistent with azide-terminated monolayers on planar Au [22,23] and Si [3,27] surfaces, and also on nanoparticles [50][51][52][53], as well as with azide-carried polymers [54,55]. These azide groups behave normally as organic groups, different from the direct bonding of AN 3 to silicon metal (SiAN 3 ), which was reported at 2168 cm À1 (v a (AN@N + @N À )), due to the proximity effect of silicon metals [8].…”

Functionalization of silica nanoparticles with 4-isocyanato-4′-(3,3′-dimethyl-2,4-dioxo-azetidino)diphenyl methane, surface chemical reactivity and nanohybrid preparation

“…This modification approach suffers for poor reactivity and low reaction rate. Gann and Yan [31] reported a versatile method for grafting polymers on SNPs. However, the first step in this approach still employed trifunctional alkoxysilane compounds as modification reagents.…”

Analysis of the surface density and reactivity of perfluorophenylazide and the impact on ligand immobilization

“…The versatility of the PFPA chemistry makes it an attractive choice for surface modification upon thermal activation or light irradiation of the azide functionality. [1][2][3][4][5][6][7][8][9][10][11][12] The PFPA immobilization method is simple, reproducible, and has been proven to be efficient to immobilize synthetic polymers, 1 graphene, 2,3 and carbohydrates [4][5][6][7] onto variety of surfaces. 8 Moreover, PFPA allows controlling the surface density of the immobilized molecules through adjustment of the PFPA solution concentration.…”