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Ionic Transport Properties of Cation-Exchange Membranes Prepared from Poly(vinyl alcohol-b-sodium Styrene Sulfonate)
| Content Provider | MDPI |
|---|---|
| Author | Kakihana, Yuriko Hashim, N. Mizuno, Taiko Anno, Marika Higa, Mitsuru |
| Copyright Year | 2021 |
| Description | Membrane resistance and permselectivity for counter-ions have important roles in determining the performance of cation-exchange membranes (CEMs). In this study, PVA-based polyanions—poly(vinyl alcohol-b-sodium styrene sulfonate)—were synthesized, changing the molar percentages $C_{CEG}$ of the cation-exchange groups with respect to the vinyl alcohol groups. From the block copolymer, poly(vinyl alcohol) (PVA)-based CEMs, hereafter called “B-CEMs”, were prepared by crosslinking the PVA chains with glutaraldehyde (GA) solution at various GA concentrations $C_{GA}$. The ionic transport properties of the B-CEMs were compared with those previously reported for the CEMs prepared using a random copolymer—poly(vinyl alcohol-co-2-acrylamido-2-methylpropane sulfonic acid)—hereafter called ”R-CEMs”. The B-CEMs had lower water content than the R-CEMs at equal molar percentages of the cation-exchange groups. The charge density of the B-CEMs increased as $C_{CEG}$ increased, and reached a maximum value, which increased with increasing $C_{GA}$. A maximum charge density of 1.47 $mol/dm^{3}$ was obtained for a B-CEM with $C_{CEG}$ = 2.9 mol% and $C_{GA}$ = 0.10 vol.%, indicating that the B-CEM had almost two-thirds of the permselectivity of a commercial CEM (CMX: ASTOM Corp. Japan). The dynamic transport number and membrane resistance of a B-CEM with $C_{CEG}$ = 8.3 mol% and $C_{GA}$ = 0.10 vol.% were 0.99 and 1.6 $Ωcm^{2}$, respectively. The B-CEM showed higher dynamic transport numbers than those of the R-CEMs with similar membrane resistances. |
| Starting Page | 452 |
| e-ISSN | 20770375 |
| DOI | 10.3390/membranes11060452 |
| Journal | Membranes |
| Issue Number | 6 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-19 |
| Access Restriction | Open |
| Subject Keyword | Membranes Polymer Science Poly(vinyl Alcohol) Block Copolymer Membrane Resistance Transport Number Cation-exchange Membrane |
| Content Type | Text |
| Resource Type | Article |
