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  • 1
    Electronic Resource
    Electronic Resource
    Consistency tests for start-up and cessation deformations of viscoelastic fluids (1990)
    Springer
    Rheologica acta 29 (1990), S. 298-309 
    Details
    ISSN: 1435-1528
    Keywords: K-BKZ model ; straincoupling ; start-upexperiments ; cessationexperiments ; consistency relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The time-dependent shear stress and first normal stress difference were measured for a polystyrene solution for start-up and cessation-flow experiments over a relatively wide range of shear rate. Consistency tests for the K-BKZ model were applied to the data, and it was concluded that the K-BKZ equation generally does not satisfactorily describe the start-up and cessation data. Modified consistency tests were developed using a strain-coupling constitutive equation, and the evidence suggests that most of the differences between the predictions of the K-BKZ theory and experiment can be explained by including a strain-coupling effect in the rheological constitutive equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01339885
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of the Wagner irreversible constitutive equation (1991)
    Springer
    Rheologica acta 30 (1991), S. 175-179 
    Details
    ISSN: 1435-1528
    Keywords: K-BKZ model ; Wagner irreversible model ; double-step experiment ; irreversibility ; flow reversal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A constitutive equation based on the concept of the irreversibility of the rupture of a polymer network has been previously proposed as an improvement to the K-BKZ model. This Wagner irreversible constitutive equation is evaluated here using data from double-step shear strain experiments. It is shown that the Wagner irreversible model does not in general provide good predictions when a comprehensive set of deformation histories is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01134606
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of free-volume theories for solvent self-diffusion in polymer-solvent systems (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 69-76 
    Details
    ISSN: 0887-6266
    Keywords: free-volume theories for solvent self-diffusion in polymer-solvent systems ; penetrant self-diffusion in polymer solutions and glassy polymers, free-volume theories for ; glassy polymers, theories for penetrant self-diffusion coefficients in ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An evaluation of free-volume theories for solvent self-diffusion is carried out using recent comprehensive data sets for penetrant self-diffusion in polymer solutions. Different theories are compared, and free-volume theories in the prediction of penetrant self-diffusion coefficients in glassy polymer systems is also evaluated. © 1993 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310109
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    Paper (German National Licenses)
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