A composition comprising an epoxy-derived covalent adaptable network, preferably an epoxy vitrimer, said epoxy-derived covalent adaptable network comprising at least one unit of formula wherein R 1, R 2, R 1', R 2', R 1", R 2" and each occurrence of R 3, each occurrence of R 3 ' and each occurrence of R 3' ' are individually selected from the group consisting of H, alkyl, alkenyl, alkynyl, aryl, cycloalkyl, arylalkyl and polymeric groups, wherein one or wherein one or more of the carbon atoms in the backbone of said alkyl, alkenyl, alkynyl, aryl or cycloalkyl may be replaced by a heteroatom independently selected from O, S, N and Si and/or wherein said alkyl, alkenyl, alkynyl, aryl or cycloalkyl may be substituted; R 4, R 7 and each occurrence of R 9 are individually selected from H or methyl, preferably R 4, Rand each occurrence of R 9 are the same, more preferably R 4, R 7 and each occurrence of R 9 are methyl; R 5, R 6 and each occurrence of R 8 are individually selected from H or methyl, preferably R 5, R 6 and each occurrence of R 8 are the same, more preferably R 5, R 6 and each occurrence of R 8 are H; X 1, X 2 and each occurrence of X 3 are individually selected from O, CR 10 R 11 and NR 12, preferably X 1, X 2 and each occurrence of X 3 are the same, preferably X 1, X 2 and each occurrence of X 3 are O; R 10, R 11 and R 12 are individually selected from H or methyl, preferably R 10, R 11 and R 12 are the same, more preferably R 10, R 11 and R 12 are H; Y 1 and Y 2 are individually selected from O and N; Z 1, Z 2, Z 6 and Z 7 represent the remainder of the epoxy-derived covalent adaptable network; Z 3, Z 4, and Z 5 represent H or the remainder of the epoxy-derived covalent adaptable network; A represents an epoxide linking moiety; B represents an amine linking moiety; C represents a vinylogous precursor linking moiety; a, b, and c individually represent an integer higher than or equal to 0, preferably an integer selected from 0-50, more preferably an integer selected from the group consisting of 0, 1, 2, 3,and 4; a + b + c is greater than or equal to 1; the epoxide linking moiety A, the amine linking moiety B and the vinylogous precursor linking moiety C each comprising or consisting of a group independently selected from the group consisting of alkyls, alkenyls, alkynyls, aryls, cycloalkyls and aryl alkyls, wherein one or more of the carbon atoms in the backbone of said alkyls, alkenyls, alkynyls, aryls, cycloalkyls and aryls alkyls may be replaced by a heteroatom independently selected from O, S, N and Si and/or wherein said alkyl, alkenyl, alkynyl aryl, cycloalky or arylalkyl may be unsubstituted or further substituted; and wherein the composition further comprises primary amine groups. R 1, R 2, R 1', R 2', R 1", R 2" and each occurrence of R 3, each occurrence of R 3 ' and each occurrence of R 3' ' are individually selected from the group consisting of H, alkyl, alkenyl, alkynyl, aryl, cycloalkyl, arylalkyl and polymeric groups, wherein one or wherein one or more of the carbon atoms in the backbone of said alkyl, alkenyl, alkynyl, aryl or cycloalkyl may be replaced by a heteroatom independently selected from O, S, N and Si and/or wherein said alkyl, alkenyl, alkynyl, aryl or cycloalkyl may be substituted; R 4, R 7 and each occurrence of R 9 are individually selected from H or methyl, preferably R 4, Rand each occurrence of R 9 are the same, more preferably R 4, R 7 and each occurrence of R 9 are methyl; R 5, R 6 and each occurrence of R 8 are individually selected from H or methyl, preferably R 5, R 6 and each occurrence of R 8 are the same, more preferably R 5, R 6 and each occurrence of R 8 are H; X 1, X 2 and each occurrence of X 3 are individually selected from O, CR 10 R 11 and NR 12, preferably X 1, X 2 and each occurrence of X 3 are the same, preferably X 1, X 2 and each occurrence of X 3 are O; R 10, R 11 and R 12 are individually selected from H or methyl, preferably R 10, R 11 and R 12 are the same, more preferably R 10, R 11 and R 12 are H; Y 1 and Y 2 are individually selected from O and N; Z 1, Z 2, Z 6 and Z 7 represent the remainder of the epoxy-derived covalent adaptable network; Z 3, Z 4, and Z 5 represent H or the remainder of the epoxy-derived covalent adaptable network; A represents an epoxide linking moiety; B represents an amine linking moiety; C represents a vinylogous precursor linking moiety; a, b, and c individually represent an integer higher than or equal to 0, preferably an integer selected from 0-50, more preferably an integer selected from the group consisting of 0, 1, 2, 3,and 4; a + b + c is greater than or equal to 1; the epoxide linking moiety A, the amine linking moiety B and the vinylogous precursor linking moiety C each comprising or consisting of a group independently selected from the group consisting of alkyls, alkenyls, alkynyls, aryls, cycloalkyls and aryl alkyls, wherein one or more of the carbon atoms in the backbone of said alkyls, alkenyls, alkynyls, aryls, cycloalkyls and aryls alkyls may be replaced by a heteroatom independently selected from O, S, N and Si and/or wherein said alkyl, alkenyl, alkynyl aryl, cycloalky or arylalkyl may be unsubstituted or further substituted; and