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Chain deformation in entangled polymer melts at re-entrant corners.

Clarke, N. and De Luca, E. and Buxton, G. and Hutchings, L.R. and Gough, T. and Grillo, I. and Graham, R.S. and Jagannathan, K. and Klein, D.H. and McLeish, T.C.B. (2010) 'Chain deformation in entangled polymer melts at re-entrant corners.', Macromolecules., 43 (3). pp. 1539-1542.


Using SANS to map the deformation of individual polymer chains in the vicinity of re-entrant corners in a contraction−expansion flow, we show that stress singularities at such corners, predicted by formulations of fluid dynamics that lack a molecular basis, do not cause extreme deformation of the chains. Multiscale modeling based on a nonlinear tube theory incorporating appropriate relaxation processes quantitatively reproduces the observed scattering, thus providing further evidence for the universality of the tube model for polymer flow.

Item Type:Article
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Date of first online publication:February 2010
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