Abstract
AbstractMechanochemical research has been extended to the study of the magnitude and mechanism for the capillary shear degradation of a narrow distribution and high molecular weight polystyrene (Mw 1,800,000). An Instron Capillary Rheometer was used to perform the experiments over the temperature ranges from 164° to 250°C. The change in molecular weight distribution was evaluated by calibrated gel permeation chromatography. The maximum shear stress employed was 8.8 × 106 dynes/cm2. It was confirmed‐as previously found with a lower molecular weight polystyrene‐that degradation could be induced at high stress at temperatures where it would not occur inclusively due to thermal forces. The activation energy of the shear degradation was +27 kcal/mole with a sign and magnitude consistent with degradation induced principally by thermal forces but distinctly augmented by mechanical energy. For the first time the effect on degradation of capillary entrance angle and reservoir conditions has been examined.
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Schedule a callMore From: Journal of Polymer Science Part C: Polymer Symposia
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