Poly(vinyl alcohol) modified by KE reactive dyes as a novel proton‐exchange membrane for potential fuel‐cell applications

Abstract

A new type of proton-exchange membrane based on poly(vinyl alcohol) (PVA) modified KE reactive dyes (KE-4BD) was prepared and evaluated as H 1 -conducting polymer electrolytes. The effects of the content of KE-4BD on the membrane H 1 conductivity and water uptake were studied with an alternating-current impedance technique and the method of weighing, respectively. Fourier transform infrared and scanning electron microscopy were used for the chemical and structural characterization of these membranes. With all of these properties, the optimal mass ratio between PVA and KE-4BD was 1:0.5, and the resulting membrane exhibited a high proton conductivity (0.109 S/cm) at room temperature; this afforded a power density of 83.9 mW/cm 2 at 210.4 mA/ cm 2 and an open-circuit voltage of 810.8 mV. The PVA/KE-4BD membranes showed a high oxidative stability in Fenton's reagent (3% H 2 O 2 v/v, 2 ppm FeSO 4 ). Thermal analysis also showed that the membranes exhibited a significant improvement in thermal stability.

Synthesis and dyeing properties of polyvinylamine dyes for cotton

“…Recently, polymeric dyes have received growing attention because of the outstanding characteristics of their constituent dyes and polymer backbones, their excellent physical properties, and high fixation to cotton under suitable conditions . These dyes have been applied in various fields, such as textiles, biology, photoelectric materials, among others . They are synthesised by bonding dye chromophores to the main or side chains of polymers through chemical reactions or the diazo couplings of polymeric intermediates …”