Nanostructured Bacterial Cellulose-Poly(4-styrene sulfonic acid) Composite Membranes with High Storage Modulus and Protonic Conductivity
authors Gadim, TDO; Figueiredo, AGPR; Rosero-Navarro, NC; Vilela, C; Gamelas, JAF; Barros-Timmons, A; Neto, CP; Silvestre, AJD; Freire, CSR; Figueiredo, FML
nationality International
journal ACS APPLIED MATERIALS & INTERFACES
author keywords bacterial cellulose; polystyrene sulfonic acid; nanostructured composite; protonic conductivity
keywords FUEL-CELL APPLICATIONS; POLYMER ELECTROLYTE; TRANSPORT-PROPERTIES; MICROBIAL CELLULOSE; ACID MEMBRANES; X-RAY; TEMPERATURE; POLYSTYRENE; DIFFRACTION; HYDROLYSIS
abstract The present study reports the development of a new generation of bio-based nanocomposite proton exchange membranes based on bacterial cellulose (BC) and poly(4-styrene sulfonic acid) (PSSA), produced by in situ free radical polymerization of sodium 4-styrenesulfonate using poly(ethylene glycol) diacrylate (PEGDA) as cross-linker, followed by conversion of the ensuing polymer into the acidic form. The BC nanofibrilar network endows the composite membranes with excellent mechanical properties at least up to 140 degrees C, a temperature where either pure PSSA or Nafion are soft, as shown by dynamic mechanical analysis. The large concentration of sulfonic acid groups in PSSA is responsible for the high ionic exchange capacity of the composite membranes, reaching 2.25 mmol g(-1) for a composite with 83 wt % PSSA/PEGDA. The through-plane protonic conductivity of the best membrane is in excess of 0.1 S cm(-1) at 94 degrees C and 98% relative humidity (RH), decreasing to 0.042 S cm(-1) at 60% RH. These values are comparable or even higher than those of ionomers such as Nafion or polyelectrolytes such as PSSA. This combination of electric and viscoelastic properties with low cost underlines the potential of these nanocomposites as a bio-based alternative to other polymer membranes for application in fuel cells, redox flow batteries, or other devices requiring functional proton conducting elements, such as sensors and actuators.
publisher AMER CHEMICAL SOC
issn 1944-8244
year published 2014
volume 6
issue 10
beginning page 7864
ending page 7875
digital object identifier (doi) 10.1021/am501191t
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000336639200108
link 24731218
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journal impact factor (jcr 2016): 7.504
5 year journal impact factor (jcr 2016): 7.823
category normalized journal impact factor percentile (jcr 2016): 89.482
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