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Reaction scheme and 1 H NMR spectra documenting the mechanochemical conversion of PS 50 - co -PHCBI 50 to polymers containing imide groups in their backbone after different sonication times. The new signals in the red boxes of the NMR spectra indicate carboncarbon double bond formation associated with cyclobutane ring opening. The full NMR spectra are provided as Supplementary Figs. 44 – 46 .

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