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DSC thermograms (2nd heating) of the polyurethane adhesives before and after retro-Diels–Alder. (a) PU1 ref; (b) PU2 (conversion of 69% DA and 37% r-DA); (c) PU3 (conversion of 68% DA and 57% r-DA); and (d) PU4 (conversion of 63% DA and 62% r-DA).
