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Synthesis and characterization of modified κ-carrageenan for enhanced proton conductivity as polymer electrolyte membrane

Polymer electrolyte membranes based on the natural polymer κ-carrageenan were modified and characterized for application in electrochemical devices. In general, pure κ-carrageenan membranes show a low ionic conductivity. New membranes were developed by chemically modifying κ-carrageenan via phosphor...

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Detalles Bibliográficos
Autores principales: Liew, Joy Wei Yi, Loh, Kee Shyuan, Ahmad, Azizan, Lim, Kean Long, Wan Daud, Wan Ramli
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5619736/
https://www.ncbi.nlm.nih.gov/pubmed/28957374
http://dx.doi.org/10.1371/journal.pone.0185313
Descripción
Sumario:Polymer electrolyte membranes based on the natural polymer κ-carrageenan were modified and characterized for application in electrochemical devices. In general, pure κ-carrageenan membranes show a low ionic conductivity. New membranes were developed by chemically modifying κ-carrageenan via phosphorylation to produce O-methylene phosphonic κ-carrageenan (OMPC), which showed enhanced membrane conductivity. The membranes were prepared by a solution casting method. The chemical structure of OMPC samples were characterized using Fourier transform infrared spectroscopy (FTIR), (1)H nuclear magnetic resonance ((1)H NMR) spectroscopy and (31)P nuclear magnetic resonance ((31)P NMR) spectroscopy. The conductivity properties of the membranes were investigated by electrochemical impedance spectroscopy (EIS). The characterization demonstrated that the membranes had been successfully produced. The ionic conductivity of κ-carrageenan and OMPC were 2.79 × 10(−6) S cm(-1) and 1.54 × 10(−5) S cm(-1), respectively. The hydrated membranes showed a two orders of magnitude higher ionic conductivity than the dried membranes.