Synthesis and Properties of Chemically Cross-Linked Poly(Vinyl Alcohol)/quaterized Hydroxyethylcellulose Ethoxylate (PVA/QHECE) as Novel Alkaline Anion-Exchange Membrane

Abstract:

A new type of chemically cross-linked polymer blend membranes consisting of poly(vinyl alcohol) (PVA) and quaterized hydroxyethylcellulose ethoxylate (QHECE) have been prepared and evaluated as OH^--conducting polymer electrolytes. The OH^--conductivity (s) of the membranes was investigated as a function of cross-linking time, blending composition and water uptake. Membrane swelling decreased with cross-linking time, accompanied by an improvement in mechanical properties and a small decrease in OH^--conductivity due to the reduced water absorption. The OH^--conductivities in the range of 2.7 ×10^-4－1.52 ×10^-3 S cm^-1 were obtained at room temperature (19±2°C), depending on the polymer composition and the content of cross-linking agent. TG analysis showed that the membranes exhibited the thermal stability high up to 350°C when incorporating 75% QHECE. In addition, the membranes displayed a high alkaline stability without losing their integrity and OH^--conductivity after conditioning in 6M KOH at 60°C for one week.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 1344-1347
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.1344
• Online since: July 2011
• Authors: Ling Ling Liu, Li Xu, Juan Xie, Lei Ding, Jin Li Qiao, Guang Li
• Keywords: Alkaline Anion-Exchange Membrane, Alkaline Stability, Blending Cross-Linking, Chemical Cross-Linking, O H^- -conductivity, P V a / Q H E C E

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