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Schematic representation of structural development in epoxy/PU systems with (a) 30 wt % PU, (b) 50 wt % PU and (c) 70 wt % PU. Reaction 1: grafting reaction between -NCO groups of PU and side -OH groups of epoxy (before adding curing agent); Reaction 2: reaction between -NCO groups of PU network and -OH groups of epoxy network (after adding curing agent). Reprinted with permission from ref. [50], Copyright [2019], Elsevier.
