Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction
AbstractSpiro poly(isatin-ethersulfone) polymers were prepared from isatin and bis-2,6-dimethylphenoxyphenylsulfone by super acid catalyzed polyhydroxyalkylation reactions. We designed and synthesized bis-2,6-dimethylphenoxyphenylsulfone, which is structured at the meta position steric hindrance by two methyl groups, because this structure minimized crosslinking reaction during super acid catalyzed polymerization. In addition, sulfonic acid groups were structured in both side chains and main chains to form better polymer chain morphology and improve proton conductivity. The sulfonation reactions were performed in two steps which are: in 3-bromo-1-propanesulfonic acid potassium salt and in con. sulfuric acid. The membrane morphology was studied by tapping mode atomic force microscope (AFM). The phase difference between the hydrophobic polymer main chain and hydrophilic sulfonated units of the polymer was shown to be the reasonable result of the well phase separated structure. The correlations of proton conductivity, ion exchange capacity (IEC) and single cell performance were clearly described with the membrane morphology. View Full-Text
Share & Cite This Article
Jin, L.; Jang, H.; Yoo, J.; Ha, J.; Choi, K.; Ryu, T.; Lee, S.; Kim, W. Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction. Polymers 2016, 8, 114.
Jin L, Jang H, Yoo J, Ha J, Choi K, Ryu T, Lee S, Kim W. Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction. Polymers. 2016; 8(4):114.Chicago/Turabian Style
Jin, Lei; Jang, Hohyoun; Yoo, Jiho; Ha, Jaeseong; Choi, Kunyoung; Ryu, Taewook; Lee, Sungkwun; Kim, Whangi. 2016. "Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction." Polymers 8, no. 4: 114.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.