Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 208, Issue 2, Pages 131-145Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200600449
Keywords
amphiphiles; atom transfer radical polymerization; core-shell structure; delivery systems; encapsulation; fragrances; hyperbranched polymer; ring-opening polymerization; star-block copolymers
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Novel amphiphilic multi-arm star-block copolymers with a hyperbranched core, a hydrophobic inner shell, and a hydrophilic outer shell have been prepared fro m a commercial hyperbranched polyester macroinitiator by ring-opening polymerization of c-caprolactone, followed by atom transfer radical polymerization of tert-butyl acrylate (tBuA). Hydrolysis of the tert-butyl groups was then used to convert the poly(tBuA) blocks to poly(acrylic acid), resulting in stable amphiphilic core-shell structures with significantly higher degrees of functionality than reported so far in the literature. A strong correlation between the maximum concentration of selected hydrophobic guest molecules and the concentration of amphiphilic star-block copolymer in aqueous solution was observed by H-1 NMR, demonstrating the capacity of these copolymers to encapsulate and disperse significant loadings (up to about 27 wt.-%) of volatile hydrophobic molecules such as fragrances in water.
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