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Polyelectrolyte Composite Membranes Containing Electrospun Ion-Exchange Nanofibers: Effect of Nanofiber Surface Charges on Ionic Transport

Author:
Seino, Fumiyasu, Konosu, Yuichi, Ashizawa, Minoru, Kakihana, Yuriko, Higa, Mitsuru, Matsumoto, Hidetoshi
Source:
Langmuir 2018 v.34 no.43 pp. 13035-13040
ISSN:
1520-5827
Subject:
asymmetric membranes, electrolytes, ion exchange, ion exchange capacity, nanofibers, polyvinyl alcohol, strength (mechanics)
Abstract:
Poly(vinyl alcohol) (PVA)-based ion-exchange nanofibers (IEX-NFs) and their composite polyelectrolyte membranes were prepared and characterized. The PVA-based NFs are well dispersed and form a three-dimensional network structure in the polymer matrix, Nafion. All of the prepared membranes show a similar ion-exchange capacity of ∼1.0 mmol g–¹. The ionic conductivities through the PVA-b-PSS-NF/Nafion composite membranes are superior to that of the Nafion membranes, but the conductivity through the PVA-NF/Nafion composite membrane is half that of the Nafion membrane. Our electrokinetic measurements clearly indicate that a high density of ion-exchange groups on the NF surface results in a continuous ionic transport path in the polymer matrix. In addition, the mechanical strength of all of the NF-composite membranes is improved compared with that of the membranes without NF.
Agid:
6190407