Brittle fracture in associative polymers: the case of ionomer melts

Aamir Shabbir, Qian Huang, Quan Chen, Ralph H. Colby, Nicolas J. Alvarez, Ole Hassager

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Abstract

Ionomers are interesting due to their applications in coatings, adhesives, films and packaging materials. A study of the underlying mechanisms for fracture in ionomers is consequently of both practical as well as theoretical interest. In this study, we employ high speed imaging coupled with uniaxial extensional rheometry to delineate the mechanics leading to the brittle fracture of ionomer melts. When these ionomers are elongated at a rate higher than the inverse relaxation time of physical crosslinks, an edge fracture occurs at a critical stress. Parabolic fracture profiles provide evidence that the phenomenon is purely elastic and bulk dissipation has little impact on the crack profile. Experimental results are interpreted within the Griffiths theory for linear elastic materials and the de Gennes theory for viscoelastic materials.
Original languageEnglish
JournalSoft Matter
Volume12
Issue number36
Pages (from-to)7606-7612
ISSN1744-683x
DOIs
Publication statusPublished - 2016

Bibliographical note

This article is published Open Access as part of the RSC's Gold for Gold initiative, licensed under a Creative Commons Attribution 3.0 Unported Licence.

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