Rueda Sanchez, Juan CarlosCampos Dávila, Estuardo Job2022-04-282022-04-2820212022-04-28http://hdl.handle.net/20.500.12404/22220New 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.enginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/pe/Coloides--SintetizaciónColoides--Caracterización y evaluaciónMateriales--Caracterización y evaluacióninfo:eu-repo/semantics/masterThesishttps://purl.org/pe-repo/ocde/ford#2.05.01https://doi.org/10.1080/15685551.2013.840471