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222. André, X.; Zhang, M.; Müller, A.H.E.: Thermo- and pH-Responsive Micelles of Poly(acrylic acid)-block-Poly(N,N-diethylacrylamide), Makromolekulare Chemie Rapid Communications 26, 558-563, published on the web April 1, 2005 (2005) -- DOI: 10.1002/marc.200400510
Key words: amphiphiles; anionic polymerization; lower critical solution temperature behavior; micelles

The bis-hydrophilic block copolymer poly(acrylic acid)45-block-poly(N,N-diethylacrylamide)360 was obtained after hydrolysis of poly(tert-butyl acrylate)45-block-poly(N,N-diethylacrylamide)360 synthesized by sequential anionic polymerization in the presence of Et3Al. The polymer is stimuli-sensitive with respect to both pH and temperature in aqueous solution, reversibly forming spherical crew-cut micelles with PDEAAm-core (h>z = 21.5 nm) under alkaline conditions for T > 35 °C as well as inverse star-like micelles with expanded PAA-core (h>z = 43.8 nm) under acidic conditions for T < 35 °C, as indicated by Dynamic Light Scattering.

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