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Polymers 2018, 10(9), 973;

Viscoelastic Properties of Unentangled Multicyclic Polystyrenes

Institute of Electronic Structure & Laser, Foundation for Research & Technology Hellas (FORTH), 70013 Heraklion, Greece
College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Lab for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen 518060, China
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
School of Chemical and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
Department of Materials Science & Technology, University of Crete, 70013 Heraklion, Greece
Author to whom correspondence should be addressed.
Received: 4 July 2018 / Revised: 10 August 2018 / Accepted: 28 August 2018 / Published: 1 September 2018
(This article belongs to the Special Issue Polymer Dynamics)
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We report on the viscoelastic properties of linear, monocyclic, and multicyclic polystyrenes with the same low molecular weight. All polymers investigated were found to exhibit unentangled dynamics. For monocyclic polymers without inner loops, a cyclic-Rouse model complemented by the contribution of unlinked chains (whose fraction was determined experimentally) captured the observed rheological response. On the other hand, multicyclic polymers with inner loops were shown to follow a hierarchical cyclic-Rouse relaxation with the outer loops relaxing first, followed by the inner loop relaxation. The influence of unlinked linear chains was less significant in multicyclic polymers with inner loops. The isofrictional zero-shear viscosity decreased with increasing number of constrained segments on the coupling sites, which was attributed to the decreasing loop size and the dilution effect due to the hierarchical relaxation. View Full-Text
Keywords: multicyclic polymer; hierarchical relaxation; rheology multicyclic polymer; hierarchical relaxation; rheology

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yan, Z.-C.; Hossain, M.D.; Monteiro, M.J.; Vlassopoulos, D. Viscoelastic Properties of Unentangled Multicyclic Polystyrenes. Polymers 2018, 10, 973.

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