Viscosity–temperature behavior of chitin solutions using lithium chloride/DMA as solvent

Schematic diagram describing the equilibrium involved in the formation of a complex species from the interaction between a carbonyl group along the chitin macromolecular chain and Li +. Solutions of chitin in Li +/ N, N-dimethylacetamide systems were studied via viscometry, using LiCl concentrations...

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Bibliographic Details
Published in:Carbohydrate research 2011-04, Vol.346 (5), p.614-618
Main Authors: de Vasconcelos, C.L., Bezerril, P.M., Pereira, M.R., Ginani, M.F., Fonseca, J.L.C.
Format: Article
Language:English
Subjects:
Acetamides - chemistry
Chitin
Chitin - chemistry
chitosan
enthalpy
entropy
Flow enthalpy of activation
Flow entropy of activation
lithium chloride
Lithium Chloride - chemistry
Molecular Structure
solvents
Solvents - chemistry
Temperature
Viscometry
Viscosity
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Summary:Schematic diagram describing the equilibrium involved in the formation of a complex species from the interaction between a carbonyl group along the chitin macromolecular chain and Li +. Solutions of chitin in Li +/ N, N-dimethylacetamide systems were studied via viscometry, using LiCl concentrations of 3% and 5% (m/v) and chitin concentrations ranging from 0.075 to 0.375 g L −1. The reduced viscosity number versus concentration plot showed a minimum that was related to the formation of Li +–O C complex moieties along chitin macromolecular chains. Viscosity behavior was affected by temperature according to the Eyring model: concentration dependence of flow enthalpy of activation was correlated to polymer–polymer interactions and flow entropy of activation to the stiffness of the complexed chitosan macromolecular chain.
ISSN:0008-6215
1873-426X
DOI:10.1016/j.carres.2010.12.016