A multiblock copolymer containing a highly sulfonated poly(phenylene sulfide sulfone) (sPPSS) hydrophilic oligomer and a partially fluorinated perfluorocyclobutyl (PFCB)-containing hydrophobic oligomer was synthesized. The sharp contrast between the hydrophilic and hydrophobic moieties induced a well-developed phase separation, which was observed in the transmission electron microscopy (TEM) images within the polymer electrolyte membrane (PEM). The increased chain mobility from the flexible ether and PFCB groups afforded facile thermal annealing of the membrane. Thermal annealing induced polymer chain packing of the hydrophobic moieties, enhancing the hydrophilic/hydrophobic phase separation. The fabricated membranes exhibited higher proton conductivity compared with those of conventional hydrocarbon PEM possessing a random copolymer architecture, while their dimensional swelling was suppressed. Additionally, under low humidification (a relative humidity (RH) of 50%), the sulfonated–fluorinated membrane achieved a high proton conductivity of up to 41.9 mScm⁻¹. A high adhesion strength of 32.7 mNcm⁻¹ was also observed, indicating strong interfacial compatibility in the membrane electrode assembly (MEA) due to its structural affinity for the contacting perfluorosulfonated binder. The enhanced hydrophilic/hydrophobic phase separations facilitated fuel cell performances of 1.13 and 0.61 Acm⁻² at 0.6 V and 65 °C under 100% and 50% RH conditions, respectively, in addition to achieving stable chemical and physical durabilities.

合成了含有高度磺化聚苯硫醚砜 (sPPSS) 亲水低聚物和部分氟化全氟环丁基 (PFCB) 的疏水低聚物的多嵌段共聚物。亲水性和疏水性部分之间的鲜明对比诱导了充分发展的相分离，这在聚合物电解质膜 (PEM) 内的透射电子显微镜 (TEM) 图像中观察到。来自柔性醚和 PFCB 基团的增加的链流动性使膜易于热退火。热退火诱导疏水部分的聚合物链堆积，增强亲水/疏水相分离。与具有无规共聚物结构的传统碳氢 PEM 相比，制造的膜表现出更高的质子传导率，而它们的尺寸膨胀受到抑制。此外，在低湿度条件下（相对湿度 (RH) 为 50%），磺化氟化膜实现了高达 41.9 mScm 的高质子传导率^-1。还观察到32.7 mNcm ^{-1 的}高粘附强度，表明膜电极组件 (MEA) 具有很强的界面相容性，因为它对接触的全氟磺化粘合剂具有结构亲和力。 除了实现稳定的化学和物理耐久性之外，增强的亲水/疏水相分离使燃料电池在 0.6 V 和 65 °C 下、100% 和 50% RH 条件下的性能分别达到 1.13 和 0.61 Acm ^-2。