Table of Contents Author Guidelines Submit a Manuscript
Journal of Chemistry
Volume 2013, Article ID 642871, 9 pages
http://dx.doi.org/10.1155/2013/642871
Research Article

An Investigation of Chitosan-Grafted-Poly(vinyl alcohol) as an Electrolyte Membrane

Department of Chemical Engineering, Faculty of Engineering, Thammasat University, 99 Moo 18, Paholyothin Road, Khlong Nung, Khlong Luang, Pathumthani 12120, Thailand

Received 9 July 2012; Revised 1 October 2012; Accepted 2 October 2012

Academic Editor: Sylvain Franger

Copyright © 2013 Panu Danwanichakul and Pongchayont Sirikhajornnam. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The membrane of chitosan-grafted-poly(vinyl alcohol)/poly(vinyl alcohol) (CS-g-PVA/PVA) was investigated along with chitosan (CS), PVA, CS/PVA, and Nafion 117 membranes for transport properties of water and methanol, mechanical properties, and ionic conductivity. The ionic conductivity, , of the crosslinked CS-g-PVA/PVA membrane was about 4.37 mS cm−1 and the methanol permeability, , was  cm2s−1. These gave the selectivity, , of 23.95 mS·s·cm−3 compared with 16.35 mS·s·cm−3 of Nafion 117 membrane. The conductivity of the crosslinked CS-g-PVA/PVA membrane was greater than others including Nafion 117 when the membranes were saturated with methanol solution of which concentration was greater than 20%. This fact and that the mechanical properties of the wet crosslinked CS-g-PVA/PVA membrane were comparable to those of other membranes made it a promising material to be used as an electrolyte membrane in a direct methanol fuel cell.