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Molecular interpretation of the "stick-slip" defect of linear polymers

Abstract : In this paper, we investigate the relationships between stick-slip defect and molecular slip at the wall for linear polymers. By considering Brochard-de Gennes slip model and molecular chain dynamics at the wall, we propose expressions for the critical shear stress and the critical shear rate at the onset of stick-slip. Moreover, we present a criterion of existence for the stick-slip defect, based on the molecular weight distribution. These various expressions are qualitatively validated by experimental data from the literature.
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Submitted on : Monday, August 2, 2010 - 4:31:55 PM
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Ahmed Allal, Bruno Vergnes. Molecular interpretation of the "stick-slip" defect of linear polymers. Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2009, 164 (1-3), pp.Pages 1-8. ⟨10.1016/j.jnnfm.2009.06.007⟩. ⟨hal-00508251⟩



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