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

✍ Scribed by Xavier André; Mingfu Zhang; Axel H. E. Müller

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
144 KB
Volume
26
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

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 (__t__BA) and N,N‐diethylacrylamide (DEAAm) in the presence of Et~3~Al. The polymer is stimuli‐sensitive with respect to both pH and temperature in aqueous solution, reversibly forming spherical crew‐cut micelles with PDEAAm‐core (〈R~h~〉~z~ = 21.5 nm) under alkaline conditions for T > 35 °C as well as inverse star‐like micelles with an expanded PAA‐core (〈R~h~〉~z~ = 43.8 nm) under acidic conditions for T < 35 °C, as indicated by dynamic light scattering.

Modes of micelle formation for poly(acrylic acid)~45~‐block‐poly(N,N‐diethylacrylamide)~360~ in aqueous solution depending on the pH and temperature.

imageModes of micelle formation for poly(acrylic acid)~45~‐block‐poly(N,N‐diethylacrylamide)~360~ in aqueous solution depending on the pH and temperature.

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