Glass Formation Behavior of Model Ionomers

Bibliographic Details
Main Author:	Ruan, Dihui
Language:	English
Published:	University of Akron / OhioLINK 2015
Subjects:	Polymers Molecular Physics Nanoscience Physics ionomers glass nanocomposites EHM Adam-Gibbs segmental relaxation dynamics interface crosslink
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=akron1430242844

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-akron14302428442021-08-03T06:30:58Z Glass Formation Behavior of Model Ionomers Ruan, Dihui Polymers Molecular Physics Nanoscience Physics ionomers glass nanocomposites EHM Adam-Gibbs segmental relaxation dynamics interface crosslink Ionomers – polymers with bonded ionic groups – are important because of their wide applications in various fields. The glass formation behavior of ionomers has direct impact on their properties and performance, and therefore demands a deeper understanding. The ionic groups collapse into distributed ionic aggregates in the ionomers. The region surrounding the aggregates shows dynamic suppression among uncharged polymer chains, and the size of this region is correlated to chains’ persistence length. This phenomenon is a consequence of the fact that there is bond connectivity between aggregates and polymers, which differs from materials with only non-bonded interfaces, like composites. Here, we perform molecular dynamics simulations of model ionomers to test this conventional view and propose a fundamental reconsideration of grafted micro-phase materials like ionomers. Based on our results, the covalent grafts are not the central factor determining linear segmental dynamics and glass formation. Instead, we find that they are equivalent to strong physical attractions, as in ungrafted nanocomposites and nanoconfined glass-formers, where near-interface mobility suppression is mediated by cooperative rearrangements intrinsic to glass-forming liquids, rather than by a unique covalent `tethering effect’. This conclusion indicates the need for a revised understanding of glass formation and segmental dynamics in materials incorporating covalent grafting. 2015-05-29 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1430242844 http://rave.ohiolink.edu/etdc/view?acc_num=akron1430242844 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Polymers Molecular Physics Nanoscience Physics ionomers glass nanocomposites EHM Adam-Gibbs segmental relaxation dynamics interface crosslink
spellingShingle	Polymers Molecular Physics Nanoscience Physics ionomers glass nanocomposites EHM Adam-Gibbs segmental relaxation dynamics interface crosslink Ruan, Dihui Glass Formation Behavior of Model Ionomers
author	Ruan, Dihui
author_facet	Ruan, Dihui
author_sort	Ruan, Dihui
title	Glass Formation Behavior of Model Ionomers
title_short	Glass Formation Behavior of Model Ionomers
title_full	Glass Formation Behavior of Model Ionomers
title_fullStr	Glass Formation Behavior of Model Ionomers
title_full_unstemmed	Glass Formation Behavior of Model Ionomers
title_sort	glass formation behavior of model ionomers
publisher	University of Akron / OhioLINK
publishDate	2015
url	http://rave.ohiolink.edu/etdc/view?acc_num=akron1430242844
work_keys_str_mv	AT ruandihui glassformationbehaviorofmodelionomers
_version_	1719437979174305792

Glass Formation Behavior of Model Ionomers

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