Details

Autor(en) / Beteiligte

• Kakihana, Yuriko
• Hashim, N Awanis
• Mizuno, Taiko
• Anno, Marika
• Higa, Mitsuru

Titel

Ionic Transport Properties of Cation-Exchange Membranes Prepared from Poly(vinyl alcohol- b -sodium Styrene Sulfonate)

Ist Teil von

• Membranes (Basel), 2021-06, Vol.11 (6), p.452

Ort / Verlag

Switzerland: MDPI AG

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• 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- -sodium styrene sulfonate)-were synthesized, changing the molar percentages 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 . 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 increased, and reached a maximum value, which increased with increasing . A maximum charge density of 1.47 mol/dm was obtained for a B-CEM with = 2.9 mol% and = 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 = 8.3 mol% and = 0.10 vol.% were 0.99 and 1.6 Ωcm , respectively. The B-CEM showed higher dynamic transport numbers than those of the R-CEMs with similar membrane resistances.