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Dynamics of star polymers in fast extensional flow and stress relaxation.

Huang, Qian and Agostini, Serena and Hengeller, Ludovica and Shivokhin, Maksim and Alvarez, Nicolas J. and Hutchings, Lian R. and Hassager, Ole (2016) 'Dynamics of star polymers in fast extensional flow and stress relaxation.', Macromolecules., 49 (17). pp. 6694-6699.


We confirm the observation from Ianniruberto and Marrucci [ Macromolecules 2013, 46, 267−275] that entangled melts of branched polystyrenes behave like linear polystyrenes in the steady state of fast extensional flow, by measuring a linear, an asymmetric star, and a symmetric star polystyrene with the same span molecular weight (180 kg/mol). We show that all three melts reach the same extensional steady-state viscosity in fast extensional flow (faster than the inverse Rouse time). We further measure stress relaxation following steady extensional flow for the three melts. We show that initially they relax in a similar way, most likely via arm retraction, at short time, but behave differently at long time due to both the length of the arm and the branch point. The terminal relaxation is described by a Doi and Edwards based model, i.e., considering pure orientational relaxation.

Item Type:Article
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Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Date accepted:23 June 2016
Date deposited:26 July 2019
Date of first online publication:15 August 2016
Date first made open access:26 July 2019

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