Viscoelastic properties of concentrated cellulose acetate solutions

Autor:	J. R. Fried, C. S. Wang
Rok vydání:	1992
Předmět:	Formamide Triethyl phosphate Dimethyl sulfoxide Mechanical Engineering Intrinsic viscosity Analytical chemistry Condensed Matter Physics Cellulose acetate Viscoelasticity Solvent chemistry.chemical_compound chemistry Mechanics of Materials General Materials Science Solvent effects
Zdroj:	Journal of Rheology. 36:929-945
ISSN:	1520-8516 0148-6055
DOI:	10.1122/1.550323
Popis:	Steady‐shear and dynamic viscoelastic properties of cellulose acetate (CA) solutions were measured for concentrations up to 20 wt. % in dimethyl formamide, dimethyl sulfoxide, N‐methyl‐2‐pyrrolidinone, and triethyl phosphate. For each solvent system, the specific viscosity showed a transition in concentration dependence from approximately c1 to c5 at about 3.4 g/dl while the steady‐state compliance of the solutions was inversely dependent on concentration for CA content above 10 wt. %. Master curves of the concentration‐reduced viscoelastic parameters were obtained by using a concentration‐dependent function equal to c. Over the entire experimental frequency range, the dynamic storage and loss moduli of the 20 wt. % solutions did not exhibit any rubbery plateaus. Results suggest that the observed transition in concentration dependence of the specific viscosity was due to the chain rigidity of CA rather than the typical polymer chain entanglement effect. The solvent nature strongly influenced the specific ...
Databáze:	OpenAIRE
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