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  • 1990-1994  (2)
  • chain disentanglement  (1)
  • classification of extensional flows  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Assessment of nonlinear strain measures for extensional and shearing flows of polymer melts (1994)
    Springer
    Rheologica acta 33 (1994), S. 506-516 
    Details
    ISSN: 1435-1528
    Keywords: Strain measure ; damping function ; extensional flow ; transversely isotropic flow ; planar flow ; shear flow ; Doi-Edwards model ; molecular stress function ; classification of extensional flows ; planarity index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract From stress-strain experiments in extensional and shearing flows, nonlinear strain measures and effective damping functions are derived for a polyisobutylene melt. The strain measures determined in planar extensional flow and in simple shear flow coincide. Experimental results are compared with predictions of two molecular theories, the Doi-Edwards model and the molecular stress function approach of Wagner and Schaeffer. Discrepancies between theories and experiment lead to a reconsideration of the classification of extensional flows. The symmetry of the flow field is identified and quantified as an important parameter influencing the strain measure, and a unifying strain measure for general extensional and shearing flows of polymer melts is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366335
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Constitutive equations from Gaussian slip-link network theories in polymer melt rheology (1992)
    Springer
    Rheologica acta 31 (1992), S. 22-31 
    Details
    ISSN: 1435-1528
    Keywords: Polymer melts ; constitution equations ; molecular theory ; chain slip ; chain disentanglement ; extensional flow with step change in flow direction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Allowing for flow-dependent slip in the junctions of a temporary junction network, we derive the constitutive equations of temporary slip-link networks. The stress tensor is determined by three material functions, namely, the time-dependent linear-viscoelastic memory function, and two strain-dependent functions describing slip and disentanglement of network strands. Slip and disentanglement are related via a mass balance for network strands. By specifying slip and disentanglement, the constitutive equations of Lodge, Wagner, Doi-Edwards, and Marrucci are shown to be special temporary slip-link constitutive equations. To demonstrate the predictive power of temporary slip-link network theories, we compare predictions and extensional flow data with step change in flow direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396464
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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