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dc.contributor.authorGallego Calvo, Rocio 
dc.contributor.authorFernández Arteaga, Jesús 
dc.contributor.authorValencia Barragán, Concepción 
dc.contributor.authorFranco Gómez, José María
dc.identifier.citationGallego Calvo, R., Fernández Arteaga, J., Valencia Barragán, C., Franco Gómez, J.M.: "Isocyanate-Functionalized Chitin and Chitosan as Gelling Agents of Castor Oil". Molecules. Vol. 18 (6), págs. 6532-6549, (2013). DOI: 10.3390/molecules18066532en_US
dc.description.abstractThe main objective of this work was the incorporation of reactive isocyanate groups into chitin and chitosan in order to effectively use the products as reactive thickening agents in castor oil. The resulting gel-like dispersions could be potentially used as biodegradable lubricating greases. Three different NCO–functionalized polymers were obtained: two of them by promoting the reaction of chitosan with 1,6-hexamethylene diisocyanate (HMDI), and the other by using chitin instead of chitosan. These polymers were characterized through 1H-NMR, FTIR and thermogravimetric analysis (TGA). Thermal and rheological behaviours of the oleogels prepared by dispersing these polymers in castor oil were studied by means of TGA and small-amplitude oscillatory shear (SAOS) measurements. The evolution and values of the linear viscoelasticity functions with frequency for –NCO–functionalized chitosan- and chitin-based oleogels are quite similar to those found for standard lubricating greases. In relation to long-term stability of these oleogels, no phase separation was observed and the values of viscoelastic functions increase significantly during the first seven days of ageing, and then remain almost constant. TGA analysis showed that the degradation temperature of the resulting oleogels is higher than that found for traditional lubricating greases.en_US
dc.description.sponsorshipThis work is part of a research project (CTQ2010-15338) sponsored by a MINECO-FEDER Programme (70% European cofunding rate). One of the authors (R. Gallego) has received a Ph.D. Research Grant from the "Ministerio de Ciencia e Innovacion". The authors gratefully acknowledge its financial support.
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherCastor oilen_US
dc.subject.otherLubricating greaseen_US
dc.titleIsocyanate-Functionalized Chitin and Chitosan as Gelling Agents of Castor Oilen_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO-FEDER Programme [CTQ2010-15338]

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