Study of cross-linking process and its influence on properties of final membrane

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28676092%3A_____%2F20%3AN0000029" target="_blank" >RIV/28676092:_____/20:N0000029 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.czemp.cz/sites/default/files/clanek/1906/prilohy/e-sbornik.pdf" target="_blank" >http://www.czemp.cz/sites/default/files/clanek/1906/prilohy/e-sbornik.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Study of cross-linking process and its influence on properties of final membrane

Popis výsledku v původním jazyce

Polymeric ion exchange membranes (IEMs) are the main components of electomembrane separation technologies such as electrodialysis. According to the structure, IEMs are divided into homogeneous and heterogeneous. Homogeneous IEMs consist of only one polymer or copolymer matrix with covalently fixed charged functional groups. Heterogeneous IEMs contain ion-exchange resin mixed with inert polymer matrix. Mechanical stability of heterogeneous IEMs could be improved by creating so called semi-interpenetrating polymer network. This structure consists of at least one linear polymer and one cross-linked polymer. This work focused on cross-linking of polyethylene by silane method and its influence on heterogeneous cation exchange membrane (CEM) in a form of semi-interpenetrating polymer network. Sheets of cross-linkable polyethylene and two laboratory CEMs were exposed to defined cross-linking conditions up to 7 days. After the exposition, materials were characterized by melt flow index (MFI) measuring, rheology determination by oscillatory rheometer, FTIR, water uptake ratio, and swelling ratio. The value of MFI of the membrane prepared from conventional HDPE was 7.9 ± 0.3 g/10 min. Unexpectedly, MFI of membrane based on semi-interpenetrating polymer network was not obtained because the sample did not melt. It was also not possible to melt this sample during the pretreatment needed for rheological characterization which disabled to use this technique. FTIR spectra showed predominantly intensive bands of polyethylene. There was no significant difference among spectra of CEMs based on semi-interpenetrating polymer network according to their exposition time. The spectra of neat cross-linkable polyethylene showed low intensive band at 1090 cm-1 corresponding to Si OCH3 structure. This band was negligible in spectra of both types of CEMs. Water uptake was of 7 % higher for CEMs based on conventional HDPE, for CEMs based on semi-interpenetrating polymer network it was practically constant during the whole exposition time. According to the experimental data, polyethylene was cross-linked even when it was not exposed to cross-linking conditions. Cross-linking could occur during preparation or CEM storage before their exposition.

Název v anglickém jazyce

Study of cross-linking process and its influence on properties of final membrane

Popis výsledku anglicky

Polymeric ion exchange membranes (IEMs) are the main components of electomembrane separation technologies such as electrodialysis. According to the structure, IEMs are divided into homogeneous and heterogeneous. Homogeneous IEMs consist of only one polymer or copolymer matrix with covalently fixed charged functional groups. Heterogeneous IEMs contain ion-exchange resin mixed with inert polymer matrix. Mechanical stability of heterogeneous IEMs could be improved by creating so called semi-interpenetrating polymer network. This structure consists of at least one linear polymer and one cross-linked polymer. This work focused on cross-linking of polyethylene by silane method and its influence on heterogeneous cation exchange membrane (CEM) in a form of semi-interpenetrating polymer network. Sheets of cross-linkable polyethylene and two laboratory CEMs were exposed to defined cross-linking conditions up to 7 days. After the exposition, materials were characterized by melt flow index (MFI) measuring, rheology determination by oscillatory rheometer, FTIR, water uptake ratio, and swelling ratio. The value of MFI of the membrane prepared from conventional HDPE was 7.9 ± 0.3 g/10 min. Unexpectedly, MFI of membrane based on semi-interpenetrating polymer network was not obtained because the sample did not melt. It was also not possible to melt this sample during the pretreatment needed for rheological characterization which disabled to use this technique. FTIR spectra showed predominantly intensive bands of polyethylene. There was no significant difference among spectra of CEMs based on semi-interpenetrating polymer network according to their exposition time. The spectra of neat cross-linkable polyethylene showed low intensive band at 1090 cm-1 corresponding to Si OCH3 structure. This band was negligible in spectra of both types of CEMs. Water uptake was of 7 % higher for CEMs based on conventional HDPE, for CEMs based on semi-interpenetrating polymer network it was practically constant during the whole exposition time. According to the experimental data, polyethylene was cross-linked even when it was not exposed to cross-linking conditions. Cross-linking could occur during preparation or CEM storage before their exposition.

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/FV40053" target="_blank" >FV40053: Elektromembránové moduly pro provoz při zvýšených teplotách se systémem aktivní regulace stahovacích sil</a><br>

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

Workshop of Students’ Presentations 2020 Book of Abstracts

ISBN

978-80-907673-2-4

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

18-19

Název nakladatele

Česká membránová platforma z.s.

Místo vydání

neuveden

Místo konání akce

Stráž pod Ralskem

Datum konání akce

21. 10. 2020

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

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