Journal
POLYMER
Volume 51, Issue 14, Pages 3039-3046Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2010.05.012
Keywords
Stimulus response; Block-brush copolymers; ATRP
Categories
Funding
- China Science and Technology Ministry [2007CB936401]
- HK Earmarked Research Grant [403706]
- NSFC [20934005]
- China Education Ministry
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Well-defined dually responsive block-brush copolymer of poly(ethylene glycol)-b-[poly(N-isopropylacrylamide)-g-poly(N,N-dimethylamino-ethylmethacrylate)] [PEG-b-P(NIPAM-g-PDMAEMA)] was successfully prepared by the combination of atom transfer radical polymerization (ATRP) and click chemistry based on azide-capped PDMAEMA and alkyne-pending PEG-b-PNIPAM copolymer. Azide-capped PDMAEMA was synthesized through ATRP of DMAEMA monomer using an azide-functionalized initiator of beta-azidoethyl-2-bromoisobutyrate. Alkyne-pending PEG-b-PNIPAM copolymer was obtained through ATRP copolymerization of NIPAM with propargyl acrylate. The final block-brush copolymer was synthesized by the click reaction between these two polymer precursors. Because of characteristics of three different blocks, the copolymer exhibited dually thermo- and pH-responsive behavior. The responsive behaviors of block-brush copolymer were studied by laser light scattering, temperature-dependent turbidity measurement and micro differential scanning calorimetry. The phase transition temperature of block-brush copolymer increased with the decrease of pH value. At pH = 5.0, the copolymer displayed weak thermo-responsive behavior and might form uni-molecular micelles upon heating. At higher pH values, the block-brush copolymer aggregated intermolecularly into the micelles during the phase transition. (C) 2010 Elsevier Ltd. All rights reserved.
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