Abstract
Shear stress and first normal stress difference relaxation data were measured for a range of shear strains using three polymers: polystyrene (PS) with narrow molecular weight distribution, PS with large polydispersity index (PI), and a commercial polyethylene, HDPE, with large PI. From these experiments a damping function, h(γ), for each polymer was determined and compared with theoretical predictions of the recent force balanced network (FBN) model proposed by Marrucci et al. [1, 2]. For comparison purposes the data were also compared with Doi and Edward [3] theory. Both models were found to overestimate the shear softening of h(γ). Nevertheless, a somewhat better description of the observed behavior was obtained with the FBN model without using any adjustable parameter.
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Acknowledgements
This work was financially supported by the NSERC (Natural Sciences and Engineering Research Council of Canada), Canada Research Chair on Polymer Physics and Nanomaterials and Steacie fellowship grants.
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Iza, M., Bousmina, M. Damping function for narrow and large molecular weight polymers: comparison with the force-balanced network model. Rheol Acta 44, 372–378 (2005). https://doi.org/10.1007/s00397-004-0419-y
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DOI: https://doi.org/10.1007/s00397-004-0419-y