3次元流動複屈折法による高分子溶融体の物質関数の測定

概要

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A theory of three-dimensional flow birefringence by which material functions of viscoelastic fluids can be obtained was developed from the theory of two-dimensional flow birefringence. The material functions could be related to measurement of phase difference, incidence angle of light and shear stress for simple shear flow through a parallel plate nozzle. The first and the second normal stress differences were obtained for high density polyethylene (M.I. =0.3, Mv=7.0 × 104) at 200°C and 220°C. The first normal stress difference was concluded to be reasonable in comparison with data previously measured by several other methods, but the second normal stress difference could not be confirmed definitely plausible from accuracy of measurement though as reported in several papers, it became negative.