volume 32, issue 8, P573-578 1992
DOI: 10.1002/pen.760320809
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Abstract: Abstract Based on a linear stress‐optical relation, off‐center and centerline velocities along with the orientation angle measurements (via the birefringence method) can be used to test constitutive equations for polymeric melts without the need to measure viscosity hood stresses directly. For polydimethylsiloxane (Dow Corning type 200 grade 300 Pa · s) melt in a 60° wedge flow cell (inward flow) at a pressure drop of 70 psi, the orientation angles computed by the Power‐Law model and Goddard‐Miller model with…

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