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

Result code in 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>

Result on the web

<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

—

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

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

Project

<a href="/en/project/FV40053" target="_blank" >FV40053: Electromembrane modules for high temperature operation with system of active tightening force control</a><br>

Continuities

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

Publication year

2020

Confidentiality

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

Article name in the collection

Workshop of Students’ Presentations 2020 Book of Abstracts

ISBN

978-80-907673-2-4

ISSN

—

e-ISSN

—

Number of pages

2

Pages from-to

18-19

Publisher name

Česká membránová platforma z.s.

Place of publication

neuveden

Event location

Stráž pod Ralskem

Event date

Oct 21, 2020

Type of event by nationality

CST - Celostátní akce

UT code for WoS article

—