NDLI: Synthesis of poly(ε-caprolactone)–silica nanocomposites: from hairy colloids to core

Content Provider	Royal Society of Chemistry (RSC)
Author	Joubert, Mathieu Delaite, Christelle Dumas, Philippe Lami, Elodie Bourgeat
Copyright Year	2005
Abstract	The synthesis of structurally well defined poly(ε-caprolactone) (PCL)–silica nanocomposites was performed following two synthetic routes:( 1) “graft from” anionic ring opening polymerization of CL initiated from the surface of silica nanoparticles that have been previously modified by grafting of hydroxyl groups, and (2) dispersion polymerization of CL in the presence of OH-functionalized silica beads. In both strategies, yttrium or aluminium alkoxides were used as catalysts. In the first case, the influence of the catalyst, the OH to Al molar ratio and the monomer concentration on the amount of grafted polymer was studied. TEM analysis revealed the formation of a dense and uniform polymer brush around the silica nanoparticles. In the second case, “core–shell” particles with a silica core and a PCL shell were successfully obtained. The grafting of a small quantity of polymer on the silica surface during the first stages of the dispersion polymerization process appeared to be a prerequisite condition for encapsulation to succeed. When raw, un-modified silica beads were used, encapsulation failed to occur.
Starting Page	1601
Ending Page	1609
Page Count	9
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	29
Issue Number	12
Journal	New Journal of Chemistry
DOI	10.1039/b508649c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Caprolactone Molar mass Ring-opening polymerization Polymerization Polymer brush Polymer Aluminium Silicon dioxide Statistical dispersion Hydroxy group Transmission electron microscopy Yttrium Monomer
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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