Hydrogen bonds can be a powerful motif to enhance reversible interactions between polymer chains and hence, dissipate energy (Figure ). Certainly, PAAm is a polymer with extensive hydrogen bonding where amide N-H groups act as donors to the amide C=O hydrogen acceptors. This was investigated in an article by Ballance et al, where PAAm was loosely covalently cross-linked. With a water content of 71%, stiffness and fracture energy remained relatively low (E = 6.3-28 kPa, Γ = 1.75-1.85 kJ/m 2 ). Contrary to AAm, N,N'-dimethylacrylamide (DMAAm) exhibits strong hydrogen bond accepting properties. In 2015, Sheiko and co-workers reported a combination of DMAAm and methacrylic acid (MAAc). In addition to the hydrogen bond donating properties of MAAc, its α-methyl group promotes hydrophobic interactions between polymer backbones throughout the polymerization. As a result, domains with a high concentration of hydrogen bonds are formed that act as energy-dissipating clusters. With this strategy, the hydrogels reached a stiffness and a fracture energy of E = 28 MPa and Γ = 9.3 kJ/m 2 , respectively at a water content of 67%. This concept was later adapted by Wang et al, who used MAAc in conjunction with methacrylamide (MAAm). With water contents ranging from 70-46%, they covered an impressive range of elastic moduli and fracture energies of E = 11.5-217.3 MPa and Γ = 2.9-23.5 kJ/m 2 , respectively. Other monomers were introduced, such as phenylalanyl methacrylate (reaching ε b = 2000%) or Npyridyl acrylamide (NPyAAm). Beside its use in metalligand interactions, VIm is also capable of forming hydrogen bonds. As such, it was used as hydrogen bond acceptor in combination with MAAc. The fracture energies of the representative samples were in a similar range, while the stiffness of poly(VIm-stat-MAAc) was approximately two orders of magnitude higher (reaching E = 28 MPa). The latter also exhibited strongly improved fracture stress (σ b < 40 MPa), which came at the expense of the failure strain (ε b = 100%).