title: Viscosity-temperature behavior of chitin solutions using lithium chloride/DMA as solvent.
abstract: 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.
authors.affiliation: Departamento de Química, Universidade do Estado do Rio Grande do Norte, Campus Central, BR-110, km 48, Mossoró, RN 59610-090, Brazil.
authors.forename: C L
authors.initials: CL
authors.lastname: de Vasconcelos
authors.forename: P M
authors.initials: PM
authors.lastname: Bezerril
authors.forename: M R
authors.initials: MR
authors.lastname: Pereira
authors.forename: M F
authors.initials: MF
authors.lastname: Ginani
authors.forename: J L C
authors.initials: JL
authors.lastname: Fonseca
mesh_terms: D000081:Acetamides / Q000737:chemistry*; D002686:Chitin / Q000737:chemistry*; D018021:Lithium Chloride / Q000737:chemistry*; D015394:Molecular Structure; D012997:Solvents / Q000737:chemistry*; D013696:Temperature; D014783:Viscosity
chemical_list: D000081:Acetamides; D012997:Solvents; D002686:Chitin; D018021:Lithium Chloride; C013959:dimethylacetamide