| 초록 |
Sulfonated polystyrene (SPSs) have been an interest for a long time in the field of membrane and ion exchange resin. However, there are not many studies on the microstructure of SPSs depending on sulfonation methods. In this study, we synthesized well-defined poly((sodium 4-styrenesulfonate)-random-styrene) (P(SS-r-St)) and poly(sodium 4-styrenesulfonate)-block-polystyrene (PSS-b-PSt) using RAFT polymerization for comparison with the SPSs by acetyl sulfate and sulfuric acid. The ionomers were analyzed using various characterizations such as SEC, 1H NMR spectroscopy, 2D NOESY, FT-IR. The model ionomers had Mn = 5,000~6,000 g/mol with narrow PDI (Ɖ = 1.10~1.17) in the SEC. By comparison of 1H NMR spectra, we confirmed that sulfonating agents can influence the microstructure of the SPSs. This was further confirmed by the microstructural evolution by the extension of SS block on the macro RAFT random ionomer. The effect of the microstructure was also analyzed using DSC. |
