Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/91172
Title: Proton conducting electrolytes composed of chondroitin sulfate polysaccharide and citric acid
Authors: 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. 
Bermudez, Verónica de Zea
Keywords: Chondroitin sulfate; Biopolymer electrolytesIonic conductivity; Citric acid
Issue Date: 5-Feb-2020
Project: info:eu-repo/grantAgreement/FCT/UID/FIS/04650/2013 
info:eu-repo/grantAgreement/FCT/UID/QUI/00686/2013 
info:eu-repo/grantAgreement/FCT/UID/QUI/50006/2019 
info:eu-repo/grantAgreement/FCT/UID/QUI/00686/2016 
info:eu-repo/grantAgreement/POCI-01-0145-FEDER-016422 
info:eu-repo/grantAgreement/SAICTPAC/0032/2015 
info:eu-repo/grantAgreement/FCT/UID/CTM/50011/2019) 
info:eu-repo/grantAgreement/FCT/UID/CTM/50025/2013 
info:eu-repo/grantAgreement/Pest-OE/QUI/UI0616/2014 
info:eu-repo/grantAgreement/PTDC/CTM/NAN/0956/20149 
info:eu-repo/grantAgreement/POCI-01-0145-FEDER-016884 
info:eu-repo/grantAgreement/FCT/SFRH/BPD/87759/2012 
info:eu-repo/grantAgreement/NORTE-01-0145-FEDER-030858 
info:eu-repo/grantAgreement/PTDC/BTM-MAT/30858/2017 
Serial title, monograph or event: European Polymer Journal
Volume: 124
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).
URI: http://hdl.handle.net/10316/91172
ISSN: 00143057
DOI: 10.1016/j.eurpolymj.2019.109453
Rights: embargoedAccess
Appears in Collections:I&D CQC - Artigos em Revistas Internacionais

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