Pali-Casanova Ramón de Jesús, Yam-Cervantes Marcial Alfredo, Zavala-Loría José Del Carmen, Loría-Bastarrachea María Isabel, Aguilar-Vega Manuel de Jesús, Dzul-López Luis Alonso, Sámano-Celorio María Luisa, Crespo-Álvarez Jorge, García-Villena Eduardo, Agudo-Toyos Pablo, Méndez-Martínez Francisco
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.
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.
Polymers (Basel). 2019 Jul 9;11(7):1169. doi: 10.3390/polym11071169.
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 ), Young's modulus (), and elongation at break (ε) 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. 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 that resulted in a conductivity of 2.7018 × 10 S cm, 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.
4,4'-（六氟异丙基）双（对苯撑氧基）二苯胺（HFDA）和2,4-氨基苯磺酸（DABS）。通过使用间苯二甲酰二氯（ISO）进行缩聚反应来进行合成。评估了共聚体中来自DABS的磺化基团摩尔浓度增加对共聚物性能的影响。进行特性粘度测试以估计分子量。在拉伸条件下进行力学测试，测定最大强度（σ）、杨氏模量（）和断裂伸长率（ε）以确定其力学性能。进行了水吸附和离子交换容量（IEC）测试。使用电化学阻抗谱（EIS）测量质子传导率。结果表明，随着磺化程度的增加，质子传导率越高。所获得的结果显示传导率值低于商业膜Nafion 115的0.0065 S/cm。具有30摩尔DABS的共聚酰胺HFDA/DABS/ISO-70/30膜获得了最佳的IEC，值为0.747 mmol/g，导致传导率为2.7018×10 S/cm，低于商业膜Nafion 115报道的数据。根据所获得的结果，我们可以建议进一步提高IEC的发展将使基于芳香族聚酰胺的膜适用于质子交换膜燃料电池。
