Fig. 4: Fatigue resistance of PEG hydrogel and PEG-PAAc hydrogel.
From: Unusually long polymers crosslinked by domains of physical bonds
Crack growth per cycle as a function of the amplitude of energy release rate for a PEG hydrogel and b PEG-PAAc hydrogel. c For a PEG hydrogel, at the crack tip, the high tension is transmitted over the polymer strand between neighboring covalent crosslinks. d For a PEG-PAAc hydrogel, at the crack tip, polymer chains in the domains slip and transmit high tension over a long distance.
