Open AccessComputation of the linear viscoelastic relaxation spectrum from capillary viscosity data
Author(s) -
Zatloukal M.,
Vlcek J.,
Tzonganakis C.,
Dobbie T.
Publication year - 2000
Publication title -
advances in polymer technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 44
eISSN - 1098-2329
pISSN - 0730-6679
DOI - 10.1002/1098-2329(200024)19:4<277::aid-adv4>3.0.co;2-o
Subject(s) - viscoelasticity , materials science , viscosity , relaxation (psychology) , thermodynamics , capillary action , extensional viscosity , computation , moduli , shear (geology) , nonlinear system , mechanics , composite material , shear viscosity , mathematics , physics , algorithm , psychology , social psychology , quantum mechanics
A simple method is presented for the estimation of the linear viscoelastic relaxation spectrum from capillary viscosity data. For that purpose, a modified Leonov model is employed and the spectra and model parameters are estimated through nonlinear regression using measured steady shear viscosity data and extensional viscosity data calculated from Cogswell's method. Using the proposed methodology, the spectra of several resins were estimated and they were used in a Maxwell model to predict the linear viscoelastic properties of these resins. The predicted properties (storage and loss moduli and complex viscosity) were found to be in very good agreement with data from oscillatory shear measurements, thus supporting the validity of the estimated relaxation spectra. © 2000 John Wiley & Sons, Inc. Adv Polym Techn 19: 277–286, 2000