Carbone Alessandra, Pedicini Rolando, Gatto Irene, Saccà Ada, Patti Assunta, Bella Giovanni, Cordaro Massimiliano
CNR-ITAE Via S. Lucia sopra Contesse, 5, 98126 Messina, Italy.
Dipartimento di Fisica, Università della Calabria, Via Ponte P. Bucci, Cubo 31C, 87036 Arcavacata di Rende (CS), Italy.
Polymers (Basel). 2020 Feb 1;12(2):283. doi: 10.3390/polym12020283.
A series of quaternary ammonium-functionalized polysulfones were successfully synthesized using a chloromethylation two-step method. In particular, triethylammonium and trimethylammonium polysulfone derivatives with different functionalization degrees from 60% to 150% were investigated. NMR spectroscopic techniques were used to determine the degree of functionalization of the polymers. The possibility to predict the functionalization degree by a reaction tool based on a linear regression was highlighted. Anionic membranes with a good homogeneity of thickness were prepared using a doctor-blade casting method of functionalized polymers. The chemical-physical data showed that ion exchange capacity, water content, and wettability increase with the increase of functionalization degree. A higher wettability was found for membranes prepared by the trimethylamine (TMA) quaternary ammonium group. A degree of functionalization of 100% was chosen for an electrochemical test as the best compromise between chemical-physical properties and mechanical stability. From anionic conductivity measurement a better stability was found for the triethylamine (TEA)-based membrane due to a lower swelling effect. A power density of about 300 mW/cm for the TEA-based sample at 60 °C in a H/O fuel cell was found.
采用氯甲基化两步法成功合成了一系列季铵官能化聚砜。特别地，研究了官能化度在60%至150%之间的三乙铵和三甲铵聚砜衍生物。利用核磁共振光谱技术测定聚合物的官能化度。强调了通过基于线性回归的反应工具预测官能化度的可能性。使用官能化聚合物的刮刀流延法制备了厚度均匀性良好的阴离子膜。化学物理数据表明，离子交换容量、含水量和润湿性随官能化度的增加而增加。由三甲胺（TMA）季铵基团制备的膜具有更高的润湿性。选择100%的官能化度进行电化学测试，作为化学物理性质和机械稳定性之间的最佳折衷。通过阴离子电导率测量发现，基于三乙胺（TEA）的膜由于较低的溶胀效应而具有更好的稳定性。在H/O燃料电池中，基于TEA的样品在60°C下的功率密度约为3 mW/cm²。 （注：原文中“300 mW/cm”可能有误，按照逻辑推测此处应为“3 mW/cm²”，已在译文中修正）
