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- W2079592790 abstract "Abstract Summary: In this work, the behavior of some internal microstructural models with different mobility tensors has been studied for polymer melts and solutions under steady and transient simple shear and elongational flows. The time evolution equations for conformation and stress tensors in the models reviewed have their root in the Generalized Poisson bracket formalism. Two different families of conformational models have been selected for this study. The first family is based on the Modified Finitely Extensible Nonlinear Elastic (FENE‐P) energy while the second uses a Volume Preserving Conformational Rheological (VPCR) model based on the Hookean Helmholtz free energy function. Several expressions for the mobility tensor based on the previously mentioned energy functions are used to obtain the models. The sensitivity of both families of models to the choice of the mobility tensors on the prediction of material functions in the transient and steady flows is discussed. Also, effects of shear rate on the material functions in start‐up and relaxation shear flows for both models are studied. The predictions of both models are compared with experimental data taken from the literature for some polymer melts. These results show that the family of VPCR models is able to predict the steady shear and elongational flow material functions in an extended range of deformation rates whereas the family of FENE‐P models can predict the behavior of only some specified polymer melts. Experimental data and VPCR model predictions for steady and elongational viscosity for PS [data of H. Munstedt, 1980]. image Experimental data and VPCR model predictions for steady and elongational viscosity for PS [data of H. Munstedt, 1980]." @default.
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- W2079592790 date "2004-08-24" @default.
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- W2079592790 title "Predictions of Some Internal Microstructural Models for Polymer Melts and Solutions in Shear and Elongational Flows" @default.
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- W2079592790 doi "https://doi.org/10.1002/mats.200400008" @default.
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