Next Article in Journal / Special Issue
One-Step Biofunctionalization of Quantum Dots with Chitosan and N-palmitoyl Chitosan for Potential Biomedical Applications
Previous Article in Journal / Special Issue
A Microfluidic Chip Using Phenol Formaldehyde Resin for Uniform-Sized Polycaprolactone and Chitosan Microparticle Generation
Article Menu

Export Article

Open AccessArticle
Molecules 2013, 18(6), 6532-6549; doi:10.3390/molecules18066532

Isocyanate-Functionalized Chitin and Chitosan as Gelling Agents of Castor Oil

1
Department of Chemical Engineering, Physical Chemistry and Organic Chemistry, University of Huelva, Campus El Carmen, Campus ceiA3, 21071 Huelva, Spain
2
CIQSO—Center for Research in Sustainable Chemistry, University of Huelva, 21071 Huelva, Spain
3
PRO2TEC—Chemical Process and Product Technology Research Center, University of Huelva, 21071 Huelva, Spain
*
Author to whom correspondence should be addressed.
Received: 19 March 2013 / Revised: 29 May 2013 / Accepted: 31 May 2013 / Published: 3 June 2013
(This article belongs to the Special Issue Chitins and Chitosans)
View Full-Text   |   Download PDF [440 KB, 18 June 2014; original version 18 June 2014]   |  

Abstract

The 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. View Full-Text
Keywords: chitin; chitosan; castor oil; isocyanate; lubricating grease; rheology chitin; chitosan; castor oil; isocyanate; lubricating grease; rheology
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Gallego, R.; Arteaga, J.F.; Valencia, C.; Franco, J.M. Isocyanate-Functionalized Chitin and Chitosan as Gelling Agents of Castor Oil. Molecules 2013, 18, 6532-6549.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]

Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top