This article is protected by copyright. All rights reserved Article Understanding the Flow Behaviour of Copolymer and Associative Polymers in Porous Media Using Extensional Viscosity Characterization: Effect of Hydrophobic Association † Madhar Sahib Azad, Yogesh Dalsania and Japan J Trivedi * Department of Civil & Environmental Engineering, School of Mining and Petroleum Engineering, University of Alberta, 6-289 Donadeo Innovation Centre for Engineering, 9211- 116 Street, Edmonton AB T6G1H9, Canada * Corresponding author E-mail addresses: mazad@ualberta.ca (M. S. Azad), dalsania@ualberta.ca (Y. Dalsania), jtrivedi@ualberta.ca (J. Trivedi) † This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: [10.1002/cjce.23169] Received 14 August 2017; Revised 9 November 2017; Accepted 14 December 2017 The Canadian Journal of Chemical Engineering This article is protected by copyright. All rights reserved DOI 10.1002/cjce.23169