Journal
BIOMACROMOLECULES
Volume 10, Issue 6, Pages 1633-1641Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bm9002317
Keywords
-
Funding
- SEPCONACYT, Mexico [2006-C01-61252]
- European Union - Latin America ALFA Project Polylife [II-0259-FA-FDC]
- CONACYT
Ask authors/readers for more resources
Chitosan-g-N-isopropylacrylamide (NIPAm) water-soluble copolymers were synthesized and characterized by FTIR and H-1 NMR spectroscopies combined with conductometric and potentiometric titrations. Their thermo-responsive, fully reversible, behavior in aqueous solutions was characterized by means of microcalorimetry and theology. During heating of copolymer solutions there is a well-known endothermic effect, which coincides with a marked increase in G' and a moderate decrement in G '' due to the formation of a hydrophobic network at the expense of the net amount of sol fraction. It was also found that a straight dependence between the values of G' above the LCST and the enthalpies associated with the transition reflecting that the connectivity in the gel network is governed by the net number of formed enthalpic-hydrophobic driven-junctions. Both the LCST and the enthalpy change vary with the ionic strength of copolymer solutions, but no dependence was found with the neutralization of the polyelectrolyte chain.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available