389231 Synthesis and Characterization of Novel Stimuli-Responsive Hydrogels Based on Polyglycerol

Thursday, November 20, 2014: 4:30 PM
International 10 (Marriott Marquis Atlanta)
Carolina Ardila-Suárez1, Leidy Carolina Solano-Delgado1, Cesar Augusto Bravo- Sanabria1 and Gustavo Ramirez-Caballero2, (1)Universidad Industrial de Santander, Bucaramanga, Colombia, (2)Chemical Engineering, Universidad Industrial de Santander, Bucaramanga, Colombia

The present study was focused on the synthesis and characterization of a hydrogel material from glycerol. The synthesized hydrogel absorbs up more than 7 times its own weight. The hydrogel absorption capacity changes in response to temperature and pH external stimuli. A hydrogel is a high-valued added product of glycerol, a co-product of the transesterification of vegetable oils. This work is part of the effort to  develop new technologies for using glycerol as a building block for valuable chemicals that may contribute to transform the actual biodiesel industry into a bio-refinery [1]. The studied hydrogel was synthetized using as building block polyglycerol obtained by the direct polymerization of glycerol. Polyglycerol has been used as starting material for drug delivery [2, 3] temperature-responsive copolymers [4], dyes adsorption from aqueous media [5], among many other applications [6-9]. Recently, Salehpour and coworkers have been reported the synthesis of polyglycerol – based hydrogels using poly (ethylene glycol) diglycidyl ether (PEGDE) as crosslinking agent [10]. In this work, polyglycerol was cross-linked with biodegradable acids such as citric and oleic acids. Chemical reactions involved in the functionalization of polyglycerol were esterification and acid-catalyzed hydration of alkenes. The effect of the proportion of cross-linked agents, citric, and oleic acid, in the final physical properties of the hydrogel were studied. It was found that hydrogel properties depend on the content of cross-linked agent, the ratio between citric and oleic acid, the functional groups present in these acids as well as their molecular length. The characterized hydrogel has heterogeneous porous with diameters in a range of 5-50. The relation between the synthetized hydrogel glass transition temperature and its response to external stimuli is discussed. Physical and chemical properties were analyzed by Scanning Electron Microscopy (SEM), Differential Scanning Calorimetric (DSC), Thermogravimetric Analysis (TGA), and Fourier Transform Infrared Spectroscopy (FTIR).  

REFERENCES

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