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Smart hydrogels based on responsive star-block copolymers

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00004813
URN to cite this document: urn:nbn:de:bvb:703-epub-4813-7

Title data

Schmalz, Alexander ; Schmalz, Holger ; Müller, Axel H. E.:
Smart hydrogels based on responsive star-block copolymers.
In: Soft Matter. Vol. 8 (2012) Issue 36 . - pp. 9436-9445.
ISSN 1744-683X
DOI der Verlagsversion: https://doi.org/10.1039/c2sm25686j

Project information

Project title:
Project's official titleProject's id
Intelligente HydrogeleSPP1259

Project financing: Deutsche Forschungsgemeinschaft

Abstract

A series of smart hydrogels based on dual stimuli responsive star-block copolymers responding to pH and temperature were prepared via atom transfer radical polymerization (ATRP) employing the core-first method. They consist of poly(2-(dimethylamino) ethyl methacrylate) (PDMA) inner blocks and outer blocks comprised of poly(di(ethylene glycol) methyl ether methacrylate) (PDEGMA). The aggregation behavior of these block copolymer stars is analyzed by dependence on block length and arm number. The dual stimuli responsiveness of the stars is demonstrated by turbidity as well as dynamic light scattering on dilute aqueous solution, and the gelation behavior of concentrated aqueous solutions is studied by rheology. Above the transition temperature of the PDEGMA outer blocks the stars form flower-like aggregates in dilute solution or free-standing gels at higher concentrations. When the temperature is increased further above the transition temperature of the PDMA inner block, the aggregates start to contract and a weakening was observed for soft gels, whereas for strong gels no influence on the moduli was detected. The behavior is controlled by both concentration and pH value. In addition, we show that the minimum polymer concentration for gel formation can be lowered by quaternizing the inner block of the stars, but a second response to stimuli is lost during the procedure.

Further data

Item Type: Article in a journal
Additional notes (visible to public): ISI:000307904300018
Keywords: SPHERICAL POLYELECTROLYTE BRUSHES; TRIBLOCK COPOLYMERS; POLY(N,N-DIMETHYLAMINOETHYL METHACRYLATE); BIOMEDICAL APPLICATIONS; WEAK POLYELECTROLYTES; REVERSIBLE HYDROGELS; AQUEOUS-SOLUTION; TEMPERATURE; GEL; PH
DDC Subjects: 500 Science > 540 Chemistry
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-4813-7
Date Deposited: 04 Sep 2020 07:30
Last Modified: 04 Sep 2020 07:30
URI: https://epub.uni-bayreuth.de/id/eprint/4813

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