Study on chemical and thermal stability of ion exchange membranes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28676092%3A_____%2F17%3AN0000044" target="_blank" >RIV/28676092:_____/17:N0000044 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Study on chemical and thermal stability of ion exchange membranes

Original language description

As ion exchange membranes (IEMs) are operated in different conditions and environments, their properties deteriorate in time. Understanding the degradation pathways is thus important for adjusting the operational conditions. The objective of this work was to study the behaviour of heterogeneous anion and cation exchange membranes (AEMs, CEMs) exposed to NaOH, HNO3 and demineralised water at 80 °C for 30 days. During the ageing period, samples were taken and their changes were evaluated as changes in areal and specific resistance and permselectivity. We also try to utilize ATR-FTIR to evaluate changes in chemical structure. As a main mechanism of degradation we determined the mechanical and chemical stress of polymer binder. At the most damaged sample, the AEM exhibited 30 days in HNO3 at 80 °C, structure was totally disintegrated which led to its cracking. In other samples we expect smaller changes in the structure, but from the decline of resistance and permselelctivity it is obvious, that in IEMs the origin and spread of micro pores, voids and ruptures took place. In the case of heterogeneous IEMs, only polyethylene binder was clearly identified from the FTIR spectra. The spectra of a new and loaded CEMs were equal, whereas the spectra of loaded AEMs showed some new absorption bands. However these changes were not assigned to the decomposition of quaternary ammonium functional groups

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Project

<a href="/en/project/LO1418" target="_blank" >LO1418: Progressive development of the Membrane Innovation Centre</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Workshop of Students’ Presentations 2017, Membranes and Membrane Processes

ISBN

978-80-906831-0-5

ISSN

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e-ISSN

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Number of pages

12

Pages from-to

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Publisher name

Czech Membrane Platform

Place of publication

Česká Lípa

Event location

Stráž pod Ralskem

Event date

Oct 18, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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