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(a) Schematics of the synthesis procedure and structure of PI/EP semi-IPN. Reprinted with permission from ref. [40], Copyright [2019], John Wiley and Sons; SEM images of fracture surfaces of (b) Diels–Alder (DA) polymer, (c) semi-IPN sample (DA/EP 50:50), and (d) the epoxy sample. Reprinted with permission from ref. [41], Copyright [2019], John Wiley and Sons.
