| 초록 |
To improve conductivity and alkaline stability of anion exchange membrane (AEM), we prepared novel nanocomposite membranes based on FAA-3 with trimethyl aminated octaphenyl polyhedral oligomeric silsesquioxane (TMA-POSS). Nanoscale TMA-POSS (1~2 nm) was distributed inside a nanochannel of FAA-3 matrix, and provided additional anion source for increased conductivity. Moreover, TMA-POSS facilitated more absorption of water, leading to increased size of nanochannel up to 10% by SAXS. In consequence, the anion conductivity of nanocomposite membranes increased up to 17% at 80 oC/100% RH. However, the anion conductivity decreased gradually above 3 wt% concentration even though it possessed larger nanochannel size, which was highly related to the aggregation of nanoparticles. In addition, we designed TMA-POSS to contain bulky phenyl group near to cation, thereby creating a steric hindrance effect. Therefore, nanocomposite membranes retained 90.4% conductivity after alkaline stability test. |
