Next Article in Journal
Detection of Acidic Pharmaceutical Compounds Using Virus-Based Molecularly Imprinted Polymers
Next Article in Special Issue
Investigation of the Propagation of Electrical Trees in a Polymer Matrix in the Corona Condition
Previous Article in Journal
Spinning Cellulose Hollow Fibers Using 1-Ethyl-3-methylimidazolium Acetate–Dimethylsulfoxide Co-Solvent
Previous Article in Special Issue
Hydrodynamic Shear Effects on Grafted and Non-Grafted Collapsed Polymers
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Polymers 2018, 10(9), 973; https://doi.org/10.3390/polym10090973

Viscoelastic Properties of Unentangled Multicyclic Polystyrenes

1
Institute of Electronic Structure & Laser, Foundation for Research & Technology Hellas (FORTH), 70013 Heraklion, Greece
2
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
3
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
4
School of Chemical and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
5
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)
Full-Text   |   PDF [3529 KB, uploaded 1 September 2018]   |  

Abstract

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
Figures

Graphical abstract

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).
SciFeed

Share & Cite This Article

MDPI and ACS Style

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

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top