Fig. 2: Mechanical properties of SilDNs.
a Combined tensile test data for the toughest printable material from each base condensation network (MM10T in light blue, MM14NV in gray, MM29NV in gold, and MM40 in green). Lines depict the average curve (N > 7), shaded regions correspond to max and min stresses at each strain value, and “x” denotes actual failure points for each material. b Toughness vs. modulus for SLA-compatible silicones and commercial SLA polyurethanes (N > 7). Material families are grouped by the shaded regions. c Normalized tear strength of double network silicones and commercial SLA polyurethanes with overlaid data points (N = 7) for custom each material. d Average stress–strain curves for 70%MM10T as fabricated by different SLA print orientations (X–Z build direction is the blue curve, Y–Z is red, X–Y is green) and molding (black curve) showing little anisotropy (N > 3). e A 3D printed (64%MM10T) surgical simulator that replicates the organ morphology and elastic modulus of cardiac tissue. f Horizontal (yellow) and vertical (blue) topologies of the printed heart closely replicate that of the target design (black lines) as measured by laser confocal microscopy. g–j This hollow device enables simulation of numerous surgical skills. The high tear strength of the base material enables closing the incision with sutures.
