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Rheology of 1‐butyl‐3‐methylimidazolium chloride cellulose solutions. III. Elongational rheology
Author(s) -
Sammons Rhea J.,
Collier John R.,
Rials Timothy G.,
Petrovan Simioan
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28928
Subject(s) - rheology , materials science , viscosity , ionic liquid , cellulose , strain hardening exponent , activation energy , shear thinning , strain rate , arrhenius equation , polymer , shear rate , polymer chemistry , composite material , thermodynamics , chemistry , catalysis , organic chemistry , physics
The elongational rheology of solutions of cellulose in the ionic liquid solvent 1‐butyl‐3‐methylimidazolium chloride ([Bmim]Cl) was measured at 80, 90, and 100°C; 8, 10, and 12 wt% cellulose; Hencky strains 5, 6, 7; and strain rates from 1 to 100 s −1 . Master curves were generated by shifting the elongational viscosity curves with respect to temperature and Hencky strain. Also, general master curves were generated by simultaneously shifting with respect to both temperatures and Hencky strain. From the Arrhenius plots of the temperature shift factors, the activation energy for elongational flow was determined. The elongational rheology of these solutions was elongational strain rate thinning similar to that of their shear behavior and polymer melts and they were also strain hardening. Both effects and the viscosity increased with cellulose concentration. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008