Determination of SPEEK sulfonation degree by titration
DOI:
https://doi.org/10.14295/bjs.v2i9.358Keywords:
polymers, PEEK, SPEEK, titration, degree of sulfonation, ion exchange capacity, PEMAbstract
Aromatic thermoplastics polymers such as poly (ether-ether ketone) PEEK, have shown to be very promising for the production of proton exchange membranes, due to their characteristics. Studies demonstrate that chemically modified polymers can have improved original properties. The sulfonation functionalization process is one of the strategies for modifying polymeric materials, which promote greater hydrophilicity, better ionic conductivity, greater wettability and better performance as a proton exchange membrane. PEEK was treated with sulfuric acid, obtaining SPEEK. The polymer was titrated in order to study its degree of sulfonation (SD), evaluate its relationship with the ion exchange capacity (IEC) and its potential application as PEM. In order to investigate the sulfonation degree (DS) of SPEEK and evaluate its relationship with the polymer's ionic exchange capacity (IEC), 0.3 g SPEEK samples were immersed in a sodium chloride solution to carry out the proton exchange. The titrations of saline solutions were performed with sodium hydroxide and, through the volume obtained, its IEC = 0.5435 meq.g-1 and its SD = 0.6 were obtained. It was proved that the relationship between the polymer mass, degree of sulfonation and ion exchange capacity can be modified, due to the optimization of the available amount of polymer and that, having knowledge of the SD of the polymer, it is possible to estimate the amount of base to be consumed, which is related to the amount of protons coming from SPEEK and present in the saline solution.
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