The encapsulation of inorganic particles in a thin polymer shell generates core-shell hybrid materials. This chapter summarizes the main contributions from the literature for the preparation of a specific example of such hybrid materials, core-shell particles composed of an inner silica core and a poly(methyl methacrylate) outer shell. The spherical silica particles used in the examples have been obtained by sol-gel methods, most commonly via the Stöber synthesis and the reverse phase microemulsion method. Depending on the choice of method for their encapsulation, the surfaces of the silica particles have been modified to promote formation of poly(methyl methacrylate) at their surface. Surface modification methods may include the covalent attachment of a polymerizable organosilane which may co-polymerize with the monomer in conventional radical polymerization or the covalent attachment of an initiator for controlled living radical polymerization. The methods presented in this chapter will include conventional in situ heterophase radical polymerization methods, namely emulsion, emulsifier-free emulsion, precipitation, dispersion, and vapour phase polymerization. We also provide several examples of surface initiated atom transfer radical polymerization, for the controlled growth of poly(methyl methacrylate) brushes on silica particles

Encapsulation o Silica Particles by a Thin Shell of Poly(Methyl) Methacrylate

FRERIS, Isidora;BENEDETTI, Alvise
2013-01-01

Abstract

The encapsulation of inorganic particles in a thin polymer shell generates core-shell hybrid materials. This chapter summarizes the main contributions from the literature for the preparation of a specific example of such hybrid materials, core-shell particles composed of an inner silica core and a poly(methyl methacrylate) outer shell. The spherical silica particles used in the examples have been obtained by sol-gel methods, most commonly via the Stöber synthesis and the reverse phase microemulsion method. Depending on the choice of method for their encapsulation, the surfaces of the silica particles have been modified to promote formation of poly(methyl methacrylate) at their surface. Surface modification methods may include the covalent attachment of a polymerizable organosilane which may co-polymerize with the monomer in conventional radical polymerization or the covalent attachment of an initiator for controlled living radical polymerization. The methods presented in this chapter will include conventional in situ heterophase radical polymerization methods, namely emulsion, emulsifier-free emulsion, precipitation, dispersion, and vapour phase polymerization. We also provide several examples of surface initiated atom transfer radical polymerization, for the controlled growth of poly(methyl methacrylate) brushes on silica particles
2013
Encapsulation Nanotechnologies
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in ARCA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/38905
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact