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Title of Journal: Colloid Polym Sci

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Abbravation: Colloid and Polymer Science

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Springer-Verlag

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DOI

10.1002/prac.18470410157

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1435-1536

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Luminescent Emphasis Type="Italic"N/Emphasisi

Authors: Tatjana Friedrich Bernd Tieke
Publish Date: 2010/08/11
Volume: 288, Issue: 14-15, Pages: 1479-1484
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Abstract

The preparation of luminescent hydrogels based on the electrostatic selfassembly of 1pyrenesulfonate PyS anions in a positively charged Nisopropylacrylamide NiPAAm/surfmer copolymer gel is described The hydrogels were prepared from a micellar aqueous solution of 11acryloyloxyundecyltrimethylammonium bromide and NiPAAm upon 60Cogamma irradiation For assembly of PyS the gel was shrunken at 50 °C and reswollen at 20 °C in an aqueous solution of sodium 1pyrenesulfonate Reswelling was accompanied by electrostatic assembly of PyS anions within the gel Subsequently the excess nonbound PyS ions were removed by repeatedly swelling and shrinking the gel in pure water at 20 °C and 50 °C respectively Incorporation of PyS ions in the hydrogel was studied using UV/Vis spectroscopy and energy dispersive xray 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

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