Fig. 6: Reprocessing performance of foamed PUE-4.
From: Dynamically crosslinked-interpenetrating networks for sustainable 3D-printed elastomeric foams
a Exchange reaction of hindered urea bonds (HUBs) within the dynamically crosslinked-interpenetrating network. b Stress relaxation curves of PUE-4 at various temperatures. (Inset: Corresponding Arrhenius plot). c Closed-loop recycling demonstration of a sectioned Kelvin lattice foam undergoing thermal reprocessing and supercritical fluid re-foaming. d Photographs of a reprocessed tensile specimen stretched to 700% strain and rapidly recovering to its original shape upon release. e Stress-strain curves of PUE-4 foam during repeated reprocessing cycles. f SEM image of supercritical fluid re-foamed PUE-4. g Cyclic compression stress-strain curves of supercritical fluid re-foamed PUE-4. h Residual strain, energy dissipation ratio, and retention of max stress of supercritical fluid re-foamed PUE-4 under cyclic compression.
