Thermo- and pH-Responsive Micelles of Poly(acrylic acid)-block-Poly(N,N-diethylacrylamide)

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 of tert‐butyl acrylate (tBA) and N,N‐diethylacrylamide (...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2005-04, Vol.26 (7), p.558-563
Main Authors: André, Xavier, Zhang, Mingfu, Müller, Axel H. E.
Format: Article
Language:English
Subjects:
amphiphiles
anionic polymerization
Applied sciences
Copolymerization
Exact sciences and technology
lower critical solution temperature behavior
micelles
Organic polymers
Physicochemistry of polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary: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 of tert‐butyl acrylate (tBA) and N,N‐diethylacrylamide (DEAAm) 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 (〈Rh〉z = 21.5 nm) under alkaline conditions for T > 35 °C as well as inverse star‐like micelles with an expanded PAA‐core (〈Rh〉z = 43.8 nm) under acidic conditions for T 
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200400510