A process for producing a hydrogel comprising the steps of: - a) sol-gel polymerization of at least one molecule of formula: wherein: • n is an integer greater than or equal to 2; • A is an organic polymer selected from proteins, peptides such as collagen derivatives, in particular sequences comprising Pro-Hyp-Gly or Pro-Pro-Gly or Asp-Pro-Gly or Pro-Lys-Gly tripeptide repeats, self-assembling peptide sequences such as Arg-Ala-Asp-Ala (SEQ ID 4), oligoprolines, oligoalanines, polysaccharides such as hyaluronic acid and derivatives thereof, oligonucleotides, C 1 -C 6 -alkylene-glycol polymers, or polyvinylpyrrolidone; • Xa is a chemical bond or a spacer group represented by a divalent radical derived from a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 10 carbon atoms, optionally intercalated with one or more structural linkers selected from arylene or fragments -O-, -S-, -C(=O)-, SO 2 or -N(R 1)-, wherein said chain is unsubstituted or is substituted by one or more radicals selected from halogen atoms, a hydroxyl group, a C 1 -C 4 alkyl group, a benzyl group and/or a phenethyl group; • R 1 represents a hydrogen atom, an aliphatic hydrocarbon group comprising from 1 to 6 carbon atoms, a benzyl or a phenethyl; • Y 1, Y 2, Y 3, which may be identical or different, each independently represent a hydrogen atom, a halogen atom, an -OR 2 group, an aryl or a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 6 carbon atoms optionally substituted by a halogen atom, an aryl group or a hydroxyl group; • R 2 represents a hydrogen atom, an aryl group or a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 6 carbon atoms; • wherein at least two Xa groups as defined above are linked to different attachment points on A; - b) mixing with water, optionally at the same time as step a); and - c) recovering the hydrogel, characterized in that the sol-gel polymerization process is carried out at physiological pH. - a) sol-gel polymerization of at least one molecule of formula: wherein: • n is an integer greater than or equal to 2; • A is an organic polymer selected from proteins, peptides such as collagen derivatives, in particular sequences comprising Pro-Hyp-Gly or Pro-Pro-Gly or Asp-Pro-Gly or Pro-Lys-Gly tripeptide repeats, self-assembling peptide sequences such as Arg-Ala-Asp-Ala (SEQ ID 4), oligoprolines, oligoalanines, polysaccharides such as hyaluronic acid and derivatives thereof, oligonucleotides, C 1 -C 6 -alkylene-glycol polymers, or polyvinylpyrrolidone; • Xa is a chemical bond or a spacer group represented by a divalent radical derived from a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 10 carbon atoms, optionally intercalated with one or more structural linkers selected from arylene or fragments -O-, -S-, -C(=O)-, SO 2 or -N(R 1)-, wherein said chain is unsubstituted or is substituted by one or more radicals selected from halogen atoms, a hydroxyl group, a C 1 -C 4 alkyl group, a benzyl group and/or a phenethyl group; • R 1 represents a hydrogen atom, an aliphatic hydrocarbon group comprising from 1 to 6 carbon atoms, a benzyl or a phenethyl; • Y 1, Y 2, Y 3, which may be identical or different, each independently represent a hydrogen atom, a halogen atom, an -OR 2 group, an aryl or a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 6 carbon atoms optionally substituted by a halogen atom, an aryl group or a hydroxyl group; • R 2 represents a hydrogen atom, an aryl group or a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 6 carbon atoms; • wherein at least two Xa groups as defined above are linked to different attachment points on A; • n is an integer greater than or equal to 2; • A is an organic polymer selected from proteins, peptides such as collagen derivatives, in particular sequences comprising Pro-Hyp-Gly or Pro-Pro-Gly or Asp-Pro-Gly or Pro-Lys-Gly tripeptide repeats, self-assembling peptide sequences such as Arg-Ala-Asp-Ala (SEQ ID 4), oligoprolines, oligoalanines, polysaccharides such as hyaluronic acid and derivatives thereof, oligonucleotides, C 1 -C 6 -alkylene-glycol polymers, or polyvinylpyrrolidone; • Xa is a chemical bond or a spacer group represented by a divalent radical derived from a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 10 carbon atoms, optionally intercalated with one or more structural linkers selected from arylene or fragments -O-, -S-, -C(=O)-, SO 2 or -N(R 1)-, wherein said chain is unsubstituted or is substituted by one or more radicals selected from halogen atoms, a hydroxyl group, a C 1 -C 4 alkyl group, a benzyl group and/or a phenethyl group; • R 1 represents a hydrogen atom, an aliphatic hydrocarbon group comprising from 1 to 6 carbon atoms, a benzyl or a phenethyl; • Y 1, Y 2, Y 3, which may be identical or different, each independently represent a hydrogen atom, a halogen atom, an -OR 2 group, an aryl or a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 6 carbon atoms optionally substituted by a halogen atom, an aryl group or a hydroxyl group; • R 2 represents a hydrogen atom, an aryl group or a saturated or unsaturated aliphatic hydrocarbon chain comprising from 1 to 6 carbon atoms; • wherein at least two Xa groups as defined above are linked to different attachment points on A; - b) mixing with water, optionally at the same time as step a); and - c) recovering the hydrogel,