Counterintuitive photomodulation of the thermal phase transition of poly(methoxy diethylene glycol acrylate) in aqueous solution by trans-cis isomerization of Copolymerized Azobenzenes
- The non-ionic monomer (methoxy diethylene glycol) acrylate is copolymerized with its azodye-functionalized acrylate analogue using reversible addition-fragmentation chain transfer (RAFT) polymerization. Copolymerization is increasingly difficult with increasing amounts of the azo-dye-bearing monomer. The resulting water-soluble polymers are thermosensitive, exhibiting lower critical solution temperature (LCST) behavior, which can be modulated by the photoinduced trans-cis isomerization of the dye. While already small contents of the hydrophobic azobenzene group reduce the phase-transition temperatures of the copolymers strongly, photoisomerization of the apolar trans-state to the more-polar cis-state has only a small effect, and decreases rather than increases the cloud points.
Author details: | Anna Miasnikova, Carlos Adrian Benitez-Montoya, André LaschewskyORCiDGND |
---|---|
DOI: | https://doi.org/10.1002/macp.201300203 |
ISSN: | 1022-1352 |
Title of parent work (English): | Macromolecular chemistry and physics |
Publisher: | Wiley-VCH |
Place of publishing: | Weinheim |
Publication type: | Article |
Language: | English |
Year of first publication: | 2013 |
Publication year: | 2013 |
Release date: | 2017/03/26 |
Tag: | azobenzene; photoisomerization; statistical copolymers; thermoresponsive materials; water-soluble polymers |
Volume: | 214 |
Issue: | 13 |
Number of pages: | 11 |
First page: | 1504 |
Last Page: | 1514 |
Funding institution: | Deutsche Forschungsgemeinschaft DFG [SPP1259, LA611/7] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Peer review: | Referiert |