A critical evaluation of step strain flows of entangled linear polymer liquids

摘要: A critical evaluation of step strain flow experiments on entangled, linear polymer liquids is performed. Roughly one-half the published shear stress relaxation modulus data for these systems are consistent with predictions well-known tube model. model developed to determine whether remaining data, which qualitatively different from predictions, simply artifacts caused by slip, an imperfect history, or transducer compliance. Modeling results suggest that factors capable producing types behavior observed in deemed anomalous. New criteria based retraction time τR, longest Rouse time, avoiding anomalies history and compliance proposed. These simple are, a majority cases, found be predicting type 60 expe...