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Effect of Sulfonic Groups Concentration on IEC Properties in New Fluorinated Copolyamides

1
Department of the Doctorate in Industrial Engineering, Universidad Internacional Iberoamericana A.C. Calle 15 No. 36 x 10 y 12. IMI III, Campeche C.P. 24560, Campeche, Mexico
2
Centro de Investigación Científica de Yucatán, Materials Unit, Calle 43 No. 130 x 32 y 34 Chuburná de Hidalgo, Mérida C.P. 97205, Yucatán, Mexico
3
Centro de Investigación y Tecnología Industrial de Cantabria (CITICAN), Calle Isabel Torres No. 21, 39011 Santander, Spain
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Department of the Doctorate in Industrial Engineering, Universidad Europea del Atlántico, Calle Isabel Torres No. 21, 39011 Santander, Spain
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Facultad de Ingeniería de la Universidad Autónoma del Carmen. Calle 56 No. 4 Esq. Avenida Concordia Col. Benito Juárez, Cd. del Carmen C.P. 24180, Campeche, Mexico
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(7), 1169; https://doi.org/10.3390/polym11071169
Received: 2 June 2019 / Revised: 28 June 2019 / Accepted: 1 July 2019 / Published: 9 July 2019
(This article belongs to the Special Issue Polymer-based Membrane Technology and Applications)
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Abstract

Seven aromatic polyamides and copolyamides were synthesized from two different aromatic diamines: 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline (HFDA) and 2,4-Aminobenzenesulfonic acid (DABS). The synthesis was carried out by polycondensation using isophthaloyl dichloride (1SO). The effect of an increasing molar concentration of the sulfonated groups, from DABS, in the copolymer properties was evaluated. Inherent viscosity tests were carried out to estimate molecular weights. Mechanical tests were carried out under tension, maximum strength ( σ max), Young’s modulus (E), and elongation at break (εmax) to determine their mechanical properties. Tests for water sorption and ion exchange capacity (IEC) were carried out. Proton conductivity was measured using electrochemical impedance spectroscopy (EIS). The results indicate that as the degree of sulfonation increase, the greater the proton conductivity. The results obtained showed conductivity values lower than the commercial membrane Nafion 115 of 0.0065 S cm−1. The membrane from copolyamide HFDA/DABS/1S0-70/30 with 30 mol DABS obtained the best IEC, with a value of 0.747 mmol g−1 that resulted in a conductivity of 2.7018 × 10−4 S cm−1, lower than the data reported for the commercial membrane Nafion 115. According to the results obtained, we can suggest that further developments increasing IEC will render membranes based on aromatic polyamides that are suitable for their use in PEM fuel cells. View Full-Text
Keywords: polyamides; sulfonation; ion exchange capacity; proton conductivity polyamides; sulfonation; ion exchange capacity; proton conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pali-Casanova, R.J.; Yam-Cervantes, M.A.; Zavala-Loría., J.C.; Loría-Bastarrachea, M.I.; Aguilar-Vega, M.J.; Dzul-López, L.A.; Sámano-Celorio, M.L.; Crespo-Álvarez, J.; García-Villena, E.; Agudo-Toyos, P.; Méndez-Martínez, F. Effect of Sulfonic Groups Concentration on IEC Properties in New Fluorinated Copolyamides. Polymers 2019, 11, 1169.

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