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1H NMR spectra of the polymer obtained after heating for (a) 5 h at 150 °C in the presence of 1 mol% EMI, (b) 9 h at 150 °C in the presence of 1 mol% EMI, (c) 1 h at 200 °C and (d) the polymer obtained by the reaction of the polymer (c) and tert-butylisocyanate. [269]. Copyright 2008. Reproduced with permission from American Chemical Society.
