Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/73069
Título: | Proton conducting electrolytes composed of chondroitin sulfate polysaccharide and citric acid |
Autor(es): | Santos, Filipe M. Barbosa, Paula C. Pereira, Rui Francisco Gonçalves Pinto Fernandes Silva, Maria Manuela Goncalves, Helena M. R. Nunes, Silvia C. Figueiredo, Filipe L. Valente, Artur J. M. Bermudez, Veronica de Zea |
Palavras-chave: | Chondroitin sulfate Biopolymer electrolytes Ionic conductivity Citric acid |
Data: | 2020 |
Editora: | Elsevier |
Revista: | European Polymer Journal |
Resumo(s): | 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 x 10(-7) to 3.7 x 10(-2) S cm(-1) 30% for RH = 30 and similar to 100%, respectively). |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/73069 |
DOI: | 10.1016/j.eurpolymj.2019.109453 |
ISSN: | 0014-3057 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S0014305719319056 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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F.M. Santos et al (Repositório).pdf | 17,59 MB | Adobe PDF | Ver/Abrir |