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Tuning the thermoresponsive properties of weak polyelectrolytes : Aqueous solutions of star-shaped and linear Poly(N,N-dimethylaminoethyl methacrylate)

Title data

Plamper, Felix A. ; Ruppel, Markus ; Schmalz, Alexander ; Borisov, Oleg V. ; Ballauff, Matthias ; Müller, Axel H. E.:
Tuning the thermoresponsive properties of weak polyelectrolytes : Aqueous solutions of star-shaped and linear Poly(N,N-dimethylaminoethyl methacrylate).
In: Macromolecules. Vol. 40 (13 November 2007) Issue 23 . - pp. 8361-8366.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma071203b

Official URL: Volltext

Abstract in another language

We investigated the thermoresponsive behavior of aqueous solutions of star-shaped and linear poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA). The observed cloud points strongly decrease with increasing pH of the solution. This is explained by a weak charging of the star polymers with decreasing pH. A significant decrease of the cloud points with increasing molecular weight for high pH, i.e., for the almost uncharged state, was found to be virtually independent of the arm number and arm length. These findings are explained by classical Flory-Huggins theory. The increase of cloud points upon charging is captured by introduction of an effective degree of polymerization. Polymers with shorter arms show slightly higher cloud, points at low pH than polymers with longer arms. The intramolecular segment density also influences the observed apparent pK(b) values, leading to higher values for stars with higher arm numbers.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:000250801700035
Keywords: TRANSFER RADICAL POLYMERIZATION; POLY N-ISOPROPYLACRYLAMIDE; INDUCED PHASE-TRANSITIONS; TEMPERATURE-DEPENDENCE; MICROPHASE SEPARATION; DIBLOCK COPOLYMERS; POLY(ACRYLIC ACID); THERMAL RESPONSE; CLUSTER MODEL; CLOUD-POINT
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 08:59
Last Modified: 15 Apr 2015 08:59
URI: https://eref.uni-bayreuth.de/id/eprint/10394