Synthesis and Self-Assembly Behavior of Four-Arm Poly(ethylene oxide)-b-poly(2-(diethylamino)ethyl methacrylate) Star Block Copolymer in Salt Solutions

A well-defined block copolymer consisting of four-arm poly(ethylene oxide)-b-poly(2-(diethylamino)ethyl methacrylate) (four-arm PEO56-b-PDEAEMA74) was synthesized by atom transfer radical polymerization. The pH-responsive self-assembly behavior was examined by potentiometric titration, surface tensi...

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Bibliographic Details
Published in:Langmuir 2007-02, Vol.23 (5), p.2382-2388
Main Authors: He, E, Ravi, P, Tam, K. C
Format: Article
Language:English
Subjects:
Chemistry
Chemistry, Physical - methods
Chromatography, Gel
Colloidal state and disperse state
Electrochemistry - methods
Exact sciences and technology
General and physical chemistry
Light
Magnetic Resonance Spectroscopy
Methacrylates - chemistry
Micelles
Micelles. Thin films
Microscopy, Electron, Transmission
Models, Chemical
Molecular Conformation
Nylons - chemistry
Polymers - chemistry
Potentiometry - methods
Salts - pharmacology
Scattering, Radiation
Surface physical chemistry
Surface Properties
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Summary:A well-defined block copolymer consisting of four-arm poly(ethylene oxide)-b-poly(2-(diethylamino)ethyl methacrylate) (four-arm PEO56-b-PDEAEMA74) was synthesized by atom transfer radical polymerization. The pH-responsive self-assembly behavior was examined by potentiometric titration, surface tensiometry, laser light scattering, and transmission electron microscopy over the course of dissociation by the addition of a base or acid. The apparent hydrodynamic radius (R h) of the micelle increased from 21 to 56 nm when the degree of protonation of the amine groups was increased from 0 to 0.5 in 0.01 M NaCl solution. In higher concentration NaCl solution, the micelle shrank due to the electrostatic charge screening of the protonated DEAEMA groups. At low pH, the micelles dissociated into unimers.
ISSN:0743-7463
1520-5827
DOI:10.1021/la062987+