ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
A molecular theory for the stress P in a concentrated polymer solution is evaluated for simple shear flow. Three rheological functions (P12, P11 - P22, P11 - P33) are predicted to be dependent on shear rate γ in a very complicated fashion, and are displayed graphically. A unique feature is that P22 - P33 is shown to have the same sign as P11 - P33 at low shear, a result in agreement with most experimental data and not predicted by other theories. A comparison with two sets of data verifies the prediction of relative behavior of shear and normal stresses at low γ, but the theory fails to fit data at high γ. Reasons for the success of the reducing factors c2 or c3 (where c is mass concentration) in constructing master curves for normal stress are suggested.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690130524
