Universität zu Köln

Friedrich, Tatjana and Tieke, Bernd (2010). Luminescent N-isopropylacrylamide-surfmer copolymer hydrogels prepared upon electrostatic self-assembly of 1-pyrenesulfonate. Colloid Polym. Sci., 288 (14-15). S. 1479 - 1485. NEW YORK: SPRINGER. ISSN 1435-1536

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Abstract

The preparation of luminescent hydrogels based on the electrostatic self-assembly of 1-pyrenesulfonate (PyS) anions in a positively charged N-isopropylacrylamide (NiPAAm)/surfmer copolymer gel is described. The hydrogels were prepared from a micellar aqueous solution of 11-acryloyloxyundecyltrimethylammonium bromide and NiPAAm upon Co-60-gamma irradiation. For assembly of PyS, the gel was shrunken at 50 A degrees C and re-swollen at 20 A degrees C in an aqueous solution of sodium 1-pyrenesulfonate. Re-swelling was accompanied by electrostatic assembly of PyS anions within the gel. Subsequently, the excess non-bound PyS ions were removed by repeatedly swelling and shrinking the gel in pure water at 20 A degrees C and 50 A degrees C, respectively. Incorporation of PyS ions in the hydrogel was studied using UV/Vis spectroscopy and energy dispersive x-ray (EDX) measurements. The amount of electrostatically adsorbed PyS was found to be proportional to the amount of copolymerized surfmer. EDX studies indicated that 20% of the bromide counterions were replaced for PyS. The PyS counterions could be released again if the functionalized hydrogel was immersed in acidified water. At a pH of 1, an almost complete release of PyS was found after 250 h. The preparation method can be used to introduce a variety of functional properties in thermoresponsive charged copolymer gels.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Friedrich, Tatjana UNSPECIFIED UNSPECIFIED UNSPECIFIED Tieke, Bernd UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-495258
DOI:	10.1007/s00396-010-2270-2
Journal or Publication Title:	Colloid Polym. Sci.
Volume:	288
Number:	14-15
Page Range:	S. 1479 - 1485
Date:	2010
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1435-1536
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language AQUEOUS-SOLUTIONS; METAL-IONS; ACID; PH; POLYMERIZATION; ADSORPTION; RELEASE Multiple languages Chemistry, Physical; Polymer Science Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49525