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http://hdl.handle.net/10773/37707
Title: | Proton conducting electrolytes composed of chondroitin sulfate polysaccharide and citric acid |
Author: | Santos, Filipe M. Barbosa, Paula C. Pereira, Rui F.P. Silva, M. Manuela Gonçalves, Helena M.R. Nunes, Sílvia C. Figueiredo, Filipe L. Valente, Artur J.M. de Zea Bermudez, Verónica |
Keywords: | Chondroitin sulfate Biopolymer electrolytes Ionic conductivity Citric acid |
Issue Date: | 5-Feb-2020 |
Publisher: | Elsevier |
Abstract: | Novel electrolytes composed of chondroitin sulfate A (CSA) and citric acid (CA) have been prepared using a clean, safe, and fast route. These electrolytes exhibit different physical-chemical properties, depending on the amount of CA. For X > 82.3%, where X is the mass ratio, in %, of CA/(CA + CSA), whitish polycrystalline powders result. Lower amounts of CA leads to the production of translucent, amorphous films, sticky for X = 75.6 and 82.0, brittle for X < 43.6 and crack-free, self-standing for 43.6 < X < 75.6%. The results obtained provide evidence that, at low pH, strong hydrogen bonding interactions take place between the anionic sulfonic and carboxylic groups of CSA and CA. CA exerts a key role, acting as a cross-linker and proton source, while simultaneously influencing sample morphology. At room temperature the highest ionic conductivity is achieved at X = 60.8%. A significant enhancement of the ionic conductivity of this sample occurs with the increase of relative humidity (RH) (from 3.1 × 10−7 to 3.7 × 10−2 S cm−1 30% for RH = 30 and ~100%, respectively). |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/37707 |
DOI: | 10.1016/j.eurpolymj.2019.109453 |
ISSN: | 0014-3057 |
Appears in Collections: | CICECO - Artigos DEMaC - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Proton Conducting Electrolytes Composed of Chondroitin Sulfate.pdf | 12.65 MB | Adobe PDF | View/Open |
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