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An investigation of the flow curves for rigid and plasticized compounds of PVC has shown that capillary rheometry on “fused” compounds is in accordance with data obtained in continuous shear. It is further concluded that the S-shaped flow curves (log shear stress against log shear rate) that can be observed are caused by the existence of stable crystallite aggregates at low temperatures and shear rates and nonisothermal conditions at high shear stresses and high shear rates.
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J. Lyngaae-J�rgensen (1977) studied this question.
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