Hydrogels

A process for preparing a hydrogel, comprising:

• a) preparing a composition comprising:
• a1) at least one macromer comprising as functional groups at least two thiol groups,
• a2) at least one macromer comprising as functional groups at least two aromatic or heteroaromatic groups each substituted by at least one sulfonyl group, wherein the at least one macromer a1) or the at least one macromer a2) has at least three of the respective functional groups;
• and
• b) reacting the the at least one macromer a1) and the at least one macromer a2) via the respective functional groups to form a hydrogel,
• wherein the functional groups of the at least one macromer a2) are functional groups of the formula (1):
• wherein:
• Ar is an electron-deficient aryl group or electron-deficient heteroaryl group;
• M is the connection to the macromer;
• R1 is N(R2)2, a straight-chain alkyl group having 1 to 20 C atoms or a branched or cyclic alkyl group having 3 to 20 C atoms, or an alkenyl or alkynyl group having 2 to 20 C atoms or a branched or cyclic alkyl group having 3 to 20 C atoms, wherein the alkyl, alkenyl or alkynyl group may be substituted in each case by one or more radicals R2 and where one or more nonadjacent CH2 groups may be replaced by O, NR2, S, R2C═CR2, C≡C, C═O, C(═O)O or C(═O)NR2, or is an aryl group or heteroaryl group which may be substituted in each case by one or more radicals R2;
• R2, identical or different at each occurrence, is H, D, F, Cl, Br, I, N(R3)2, CN, NO2, OR3, SR3, C(═O)OR3, C(═O) N(R3)2, C(═O) R3, a straight-chain alkyl group having 1 to 20 C atoms or an alkenyl or alkynyl group having 2 to 20 C atoms or a branched or cyclic alkyl group having 3 to 20 C atoms, wherein the alkyl, alkenyl or alkynyl group may be substituted in each case by one or more radicals R3, where one or more nonadjacent CH2 groups may be replaced by R3C═CR3, C≡C, C═O, NR3, O, S, C(═O)O or C(═O)NR3, or is an aryl group or heteroaryl group which may be substituted in each case by one or more radicals R3;
• and
• R3, identical or different at each occurrence, is H, D, F, OH, or an aliphatic, aromatic and/or heteroaromatic organic radical in which one or more H atoms may also be replaced by F.