Tuning the thermoresponsiveness of weak polyelectrolytes by pH and light : Lower and upper critical-solution temperature of Poly(N,N-dimethylaminoethyl methacrylate)

Title data

Plamper, Felix A. ; Schmalz, Alexander ; Ballauff, Matthias ; Müller, Axel H. E.:
Tuning the thermoresponsiveness of weak polyelectrolytes by pH and light : Lower and upper critical-solution temperature of Poly(N,N-dimethylaminoethyl methacrylate).
In: Journal of the American Chemical Society. Vol. 129 (2007) Issue 47 . - pp. 14538-14539.
ISSN 1520-5126
DOI: https://doi.org/10.1021/ja074720i

Official URL:

Abstract in another language

The presence of multivalent counterions induces an upper critical solution temperature (UCST) in addition to the known lower critical solution temperature (LCST) of poly(N N -dimethylaminoethyl methacrylate) (PDMAEMA). The LCST-type cloud points can be adjusted by pH of the buffer, whereas the UCST-type cloud points can be adjusted by the concentration of trivalent counterions. High pH favors the LCST transition, whereas lower pH extends the UCST-type miscibility gap at constant concentration of trivalent counterions. By use of hexacyanocobaltate(III) as a trivalent counterion, we can even switch off again the UCST-behavior by UV-illumination (photoincluced dissolution).

Further data

Item Type:	Article in a journal
Refereed:	Yes
Additional notes:	ISI:000251142200005
Keywords:	PHASE-BEHAVIOR; WATER; UCST; MICELLES; POLYMERS; LCST
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner Profile Fields > Advanced Fields > Polymer and Colloid Science Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Profile Fields Profile Fields > Advanced Fields Research Institutions Research Institutions > Research Centres
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 540 Chemistry
Date Deposited:	15 Apr 2015 08:51
Last Modified:	15 Jul 2022 10:46
URI:	https://eref.uni-bayreuth.de/id/eprint/10393