Flow Birefringence of Viscoelastic Fluid : 1st Report, The Temperature and Concentration Dependences of Flow Bire fringenece

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Studies on the flow birefringence of polymer solutions and polymer melts in the shear fields are expected to afford useful means for the rheological analysis of a viscoelastic flow.Experiments with Furukawa Polybutene HV 300 and aqueous solution of carboxymethyl cellulose were carried out with concentric cylinder type measuring device to clarify the interrelations between the shear rate γ and the shear stress τ dependences of the fringe order per unit optical path n and the extinction angle λ as weel as the temperature and the concentration dependences of these relations.The shear rate-optical relation obtained was approximated within a confined shear rate range by the following expression. n=C(γ)γ=Cmγm where both Cm and m are constants and C(γ) is called shear rate-optical coefficient. The time-temperature and the time-concentration reduction laws held well with n vs. C(γ) relation. Furthermore, the stress-optical relation was approximated by the following formula. n=2Cστ/sin 2X where Cσ is the stress-optical coefficient.

Journal

  • Bulletin of JSME

    Bulletin of JSME 17 (104), 202-209, 1974

    The Japan Society of Mechanical Engineers

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