Study on chemical and thermal stability of ion exchange membranes

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Study on chemical and thermal stability of ion exchange membranes

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

Study on chemical and thermal stability of ion exchange membranes

Popis výsledku anglicky

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

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

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

Projekt

<a href="/cs/project/LO1418" target="_blank" >LO1418: Progresivní rozvoj Membránového inovačního centra</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

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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Počet stran výsledku

12

Strana od-do

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Název nakladatele

Czech Membrane Platform

Místo vydání

Česká Lípa

Místo konání akce

Stráž pod Ralskem

Datum konání akce

18. 10. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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