Li, Z;
Li, H;
Sun, Z;
Hao, B;
Lee, T-C;
Feng, AC;
Zhang, L;
(2020)
Synthesis of star-shaped polyzwitterions with adjustable UCST and fast responsiveness by a facile RAFT polymerization.
Polymer Chemistry
, 11
(18)
pp. 3162-3168.
10.1039/d0py00318b.
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Abstract
Dual thermo- and pH-responsive star polymers with tunable upper critical solution temperatures (UCST) were synthesized by an “arm-first” RAFT polymerization approach. Crosslinking took place in a single step involving polymerization of 3-dimethyl(methacryloyloxyethyl) ammonium propane sulfonate (DMAPS) mediated by a macroRAFT agent containing carboxylic end-group and in the presence of crosslinker N,N-methylenebis(acrylamide) (MBA). Varied-temperature turbidity analysis, dynamic light scattering (DLS) and rheology analysis revealed that the star-shaped PDMAPS had a smaller hydrodynamic volume while retaining fast response properties, compared with linearly-shaped PDMAPS. Meanwhile, zeta-potential was used to determine that the range of UCST regulated by pH was greatly expanded and proportional to the number of end-groups that could be generally manipulated through RAFT polymerization. By changing the pH values from 3 to 10, the adjustable UCST range of the star polymer solution can reach over 36 °C. These results demonstrate that the topological structure and end-group effect are able to manipulate the phase transition behavior of polyzwitterions. These materials offer great potential as additives or drug delivery vehicles in biomedical applications.
| Type: | Article |
|---|---|
| Title: | Synthesis of star-shaped polyzwitterions with adjustable UCST and fast responsiveness by a facile RAFT polymerization |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d0py00318b |
| Publisher version: | https://doi.org/10.1039/d0py00318b |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10095083 |
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