Synthesis and characterization of new pH- and thermo-responsive hydrogels based on N-isopropylacrylamide and 2-oxazolines

Carlos Rueda J, Campos E, Komber H, Zschoche S, Haeussler L, Voit B (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Designed Monomers and Polymers

Book Volume: 17

Pages Range: 208-216

Journal Issue: 3

DOI: 10.1080/15685551.2013.840471

Abstract

New pH- and thermo-responsive hydrogels (HG) were synthesized by free radical polymerization of N-isopropylacrylamide and a macromonomer, which was a hydrolyzed random copolymer of 2-carboxyethyl- and 2-methyl-2-oxazoline, using a bisacrylamide as crosslinker. The polymerization was carried out in a mixture of water and ethanol at room temperature and was initiated by ammonium peroxodisulfate. The HG showed conformational transitions with variation of temperature and/or pH-value and as a function of hydrogel composition. This property was shown macroscopically as hydrogel contraction or expansion. The HG structures were characterized by high-resolution magic angle spinning (HRMAS) NMR spectroscopy. The thermal properties, in particular the lower critical solution temperatures, were determined by temperature-dependent HRMAS NMR measurements and differential scanning calorimetry. The pH responsibility was determined by swelling experiments in water at different pH values. © 2013 Taylor & Francis.

Involved external institutions

Pontifical Catholic University of Peru / Pontificia Universidad Católica del Perú (PUCP) PE Peru (PE) Leibniz-Institut für Polymerforschung Dresden e. V. DE Germany (DE)

How to cite

APA:

Carlos Rueda, J., Campos, E., Komber, H., Zschoche, S., Haeussler, L., & Voit, B. (2014). Synthesis and characterization of new pH- and thermo-responsive hydrogels based on N-isopropylacrylamide and 2-oxazolines. Designed Monomers and Polymers, 17(3), 208-216. https://dx.doi.org/10.1080/15685551.2013.840471

MLA:

Carlos Rueda, Juan, et al. "Synthesis and characterization of new pH- and thermo-responsive hydrogels based on N-isopropylacrylamide and 2-oxazolines." Designed Monomers and Polymers 17.3 (2014): 208-216.

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