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- W2014861039 abstract "Abstract Assignments have been made for the EK′α,a′-diad quaternary carbon signals in both the acid and DMSO-d6 solution 13C n.m.r. spectra of the sulphonated aryl ether ketone/aryl ether ether ketone copolymer (sEK/EEK). Signals have been assigned to specific monomer sequences and sulphonation patterns with the latter information (in acid solution) derived from a consideration of the end group signals in the 13C spectrum of a low molecular weight, fluorine ended poly(aryl ether ether ketone), F-sPEEK. Comparison of the spectra of sEK/EEK in the two media with the corresponding spectra of the non-sulphonated polymer (using, in the latter case, calculated shifts for the DMSO solution spectrum) indicates the chemical shift changes caused by sulphonation to be considerably different in the two solvents. Thus on sulphonation the signal range is expanded in DMSO and contracted in acid solution and, furthermore, if sulphonation in a specific position causes a lowfield shift of the observed carbon atom, C∗, in DMSO the equivalent effect will be to highfield in acid (and vice versa). This is interpreted in terms of a greater similarity of the π systems in DMSO and acid solution when the material is sulphonated, compared to the unmodified EK/EEK. The level of carbonyl protonation in sulphuric acid is, therefore, much reduced from that in a non-sulphonating acid." @default.
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- W2014861039 date "1991-01-01" @default.
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- W2014861039 title "Substituent effects in the 13C n.m.r. spectra of aryl ether copolymers. 6. Sulphonated aryl ether ketones" @default.
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- W2014861039 doi "https://doi.org/10.1016/0032-3861(91)90421-e" @default.
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