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Viscosity-temperature behavior of chitin solutions using lithium chloride/DMA as solvent. 2011
Departamento de Química, Universidade do Estado do Rio Grande do Norte, Campus Central, BR-110, km 48, Mossoró, RN 59610-090, Brazil.
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 gL(-1). The reduced viscosity number versus concentration plot showed a minimum that was related to the formation of Li(+)-OC 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.
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