Ring‐opening polymerization of ε‐caprolactone and L‐lactide from silica nanoparticles surface

Abstract

Coating of silica nanoparticles by biocompatible and biodegradable polymers of ε‐caprolactone and L‐lactide was performed in situ by ring‐opening polymerization of the cyclic monomers with aluminum, yttrium, and tin alkoxides as catalysts. Hydroxyl groups were introduced on the silica surface by grafting of a prehydrolyzed 3‐glycidoxypropyl trimethoxysilane to initiate a catalytic polymerization in the presence of metal alkoxides. In this manner, free polymer chains were formed to grafted ones, and the graft density was controlled by the nature of the metal and the alcohol‐to‐metal ratio. The grafting reaction was extensively characterized by spectroscopic techniques and quantified. Nanocomposites containing up to 96% of polymer were obtained by this technique. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 1976–1984, 2004

Facile Access to Hydroxy‐Functional Core–Shell Microspheres via Grafting of Ethylene Oxide by Anionic Ring‐Opening Polymerization

“…In addition, they also grafted e-caprolactone and D-lactide from the surface of silica nanoparticles by anionic ring-opening polymerization (AROP). [20] In this study, we widen the scope of our research to graft hydrophilic polymers such as PEO from core PDVB microspheres using AROP. The residual vinyl groups on the surface allow for the direct grafting of EO.…”

Hairy PEO‐Silica Nanoparticles through Surface‐Initiated Polymerization of Ethylene Oxide

“…[8] The present note aims at extending this strategy to ethylene oxide (EO), by using a controlled heterogeneous ROP catalytic process in order to yield hairy poly(ethylene oxide) (PEO)/silica nanoparticles. To our knowledge, this is the first example of ''graft-from'' polymerization of EO to date.…”

Oligomeric Branched Polyethers with Multiple Hydroxyl Groups by Cationic Ring‐Opening Polymerization for Inorganic Surface Modification

“…Copyright ß 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.ms-journal.de presence of GPS fragments and poly(EH-MOX) macromolecules on the silica surface was confirmed by the 13 C CP MAS analysis. Figure 4 presents corresponding spectra.…”

“…[5,6] 13 C NMR spectra of the obtained products allowed the confirmation that branched polymers were indeed formed. In the 13 C NMR spectra signals coming from linear, branched, and terminal units were well separated (after esterification with (CF 3 CO) 2 O). Determined DB (degree of branching) values were about 0.25.…”

“…[12] In the present work, we polymerized hydroxysubstituted oxetane (EHMOX) after functionalization of nanoparticles with 3-glycidoxypropyl trimethoxysilane (GPS). [13] The applied procedure is depicted in the Scheme 6.…”