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Colloid and Polymer Science
Erschienen in: Colloid and Polymer Science 11/2018

12.09.2018 | Original Contribution

Synthesis of a double-hydrophilic star-block copolymer by aqueous SET-LRP and its dual-stimuli responses

verfasst von: Ling Wang, Zhendong Li, Pingsen Huang, Zongjie He, Wei Ding

Erschienen in: Colloid and Polymer Science | Ausgabe 11/2018

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Abstract

The synthesis of a well-defined dual-responsive double-hydrophilic star-block copolymer by single-electron-transfer living radical polymerization (SET-LRP) in aqueous solution is reported. Conditions for iterative block formation have been optimized for an N-isopropylacrylamide three-armed star-shaped polymer, which was prepared with DP = 120–360 with full conversion in < 30 min with polydispersity index (Ð) < 1.18. To demonstrate this approach for true block stimuli-responsive copolymer materials, a well-defined block polymer containing N-isopropylacrylamide, dimethylaminoethyl methacrylate, and N-vinylpyrrolidone has been prepared in high purity, with purification only required in the final step. The Ð after each chain extension was below 1.20. The polymer has been characterized by FTIR spectroscopy, 1H NMR spectrometry, and gel permeation chromatography. The responsive behaviors of the block-star copolymer have been studied by turbidity measurements, dynamic light scattering, and transmission electron microscopy. The phase transition temperature of the star-block copolymer increased with decreasing pH. At pH 3.0, the copolymer displayed weak thermo-responsive behavior. At higher pH (8.6 and 10.0), the star-block copolymer showed a strong thermal response and formed spherical micelles and vesicles.
Vorheriger Artikel The adsorption property and mechanism of phenyl/amine end-capped tetraaniline for alizarin red S
Nächster Artikel Preparation and characterization of columnar hydrohematite particles from a forced hydrolysis reaction using sodium gluconate

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Metadaten
Titel
Synthesis of a double-hydrophilic star-block copolymer by aqueous SET-LRP and its dual-stimuli responses
verfasst von
Ling Wang
Zhendong Li
Pingsen Huang
Zongjie He
Wei Ding
Publikationsdatum
12.09.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 11/2018
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-018-4398-4

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