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불소관능기인 perfluorocyclobutane (PFCB)기를 포함하는 후술폰화 poly (arylene ether sulfone) 랜덤 공중합체를 다공성 Polytetrafluoroethylene (PTFE) 막에 함침시켜 새로운 복합막을 제조하였다. 후술폰화 랜덤 공중합체는 trifluorovinyloxy 그룹을 양말단에 포함하는 biphenyl계와 sulfonyl계 단량체로부터 제조되었는데, biphenyl계와 sulfonyl계의 비율을 6 : 4와 4 : 6으로 조절 후 중부가반응 형태의 열중합과 chlorosulfonic acid (CSA)를 이용한 후술폰화 반응을 통하여 얻어졌다. 이렇게 제조된 랜덤 공중합체의 농도를 달리하면서(5~20 wt%) 다공성 PTFE 막에 함침시켜 복합막을 제조하였고, 이온 교환 능력(IEC), 함수율, 이온전도도를 측정하여 강화되지 않은 랜덤공중합체 및 Nafion과 비교하였다. 제조된 단량체 및 고분자의 구조와 순도는 각각 1H-NMR, 19F-NMR와 FT-IR를 통하여 확인하였으며, 제조된 복합막의 형태는 SEM으로 관찰하였다.
New composite membranes were manufactured by impregnating post-sulfonated poly(arylene ether sulfone)s containing perfluorocyclobutane (PFCB) groups into porous polytetrafluoroethylene (PTFE) films. Two kinds of post-sulfonated poly(arylene ether sulfone)s with two different monomer ratios (sulfonable biphenylene monomer : non-sulfonable sulfonyl monomer = 6 : 4, 4 : 6) were first prepared through three synthetic steps: synthesis of trifluorovinylether-terminated monomers, thermal cycloaddition polymerization and post-sulfonation using chlorosulfonic acid (CSA). The composite membranes were then prepared by adjusting the concentrations (5~20 wt%) of the resulting copolymers impregnated in the PTFE films. The water uptake, ion exchange capacity (IEC) and ion conductivity of the composite membranes were characterized and compared with their unreinforced dense membranes and Nafion. All the synthesized compounds, monomers and polymers were characterized by 1H-NMR, 19F-NMR and FT-IR and the composite membranes were observed with scanning electron micrographs (SEM).
