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Full stacked proton decoupled 13C-NMR spectra of the PS0 (original) and PS1–4 (thermally treated) samples (a) and (b) expansions of the backbone methylene/methine (c) and ipso carbon regions 1H-NMR spectra of the PS1–4 (thermally treated) samples. Labels 1–6 indicate the carbon atoms on the PS diagram featured.
