Efecto de la sulfonación del estireno-éster acrílico sobre las propiedades de las membranas de intercambio protónico

Abstract

In this work was studied the effect of sulfonation of styrene-acrylic ester and of titanium dioxide nanoparticles on the proton exchange membranes. It was evaluated the physicochemical characterization of membranes, such as, the water uptake capacity, ion exchange capacity, the mechanic properties of stress/strain, and the chemical functional groups present in the membrane structure by FTIR analysis. Water uptake increases with increasing the time of sulfonation reaction, reaching 60.9% after 8 hours of sulfonation; while, ion exchange capacity of loaded-sulfonated membrane increases with increasing the time of sulfonation reaction and with increasing the TiO 2 load, reaching 0.39 meq/g for 8 hours and 4% TiO 2. It was observed that the elasticity of the synthesized membranes increases with increasing the time of sulfonation reaction, and it decreases with the addition of the TiO 2 load. This physicochemical property set allows to consider the membrane with high potential of application in the fuel cells area.

Synthesis of a proton exchange membrane from SEBS copolymer and natural latex modified with V2O5 for fuel cells

“…To obtain water absorption capacity, dry membranes were weighed (Ws), then immersed in distilled water at room temperature for 24 hours, after this time they Synthesis of a proton exchange membrane 997 were removed from the water and weighed again (Wh). The percentage of water retained was calculated with the following equation [2].…”

“…Within this group are the proton exchange membranes fuel cells (PEMFC) which do not present generation of polluting gases, but which have had a slow introduction to the market and high electrolyte costs. Reason for which it is necessary to characterize new polymers or polymer mixtures [2,3] that allow to continue with the development of fuel cells. It has been shown that the addition of inorganic filler tends to improve the characteristics of the polymeric membrane such as water retention, ion exchange and mechanical properties [1,2].…”

Synthesis of a proton exchange membrane from n-butyl acrylate/styrene modified with Fe2O3 for fuel cells

“…The ion exchange capacity was determined by introducing the membranes in a 1M HCl solution for 24 hours at room temperature, then submerged in a 1 M NaCl solution for 24 hours. After, the protons released from the membranes were titrated with a 0.01M NaOH solution [6]. The breaking strain, the elongation to rupture and the Young's modulus of each synthesized membrane were measured with an EZ-S Universal Shimadzu texturometer.…”

“…The reference Nafion® are the most used membranes commercially due their high proton conductivity, and mechanical and chemical stability, but they have disadvantages such as heavy reliance on hydration, reduction of conductivity at temperatures above the ambient and high cost [5]. Studies show that the addition of inorganic filler tends to improve the physicochemical properties of the membrane [5,6]. In this work, proton exchange membranes are obtained from n-butyl acrylate/styrene copolymer, modified with load of ferric oxide to evaluate its application in fuel cells.…”

Effect of the sulfonation on membranes synthetized from SEBS and natural latex

“…Therefore, it is necessary to study new polymeric materials that can be used in these devices. It has been reported that the application of sulfonation reaction tends to improve the physicochemical and mechanical characteristics of the polymer [3,4].…”