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We model the mechanics of associating trivalent dendrimer network glasseswith a focus on their energy dissipation properties. Various combinations ofsticky bond (SB) strength and kinetics are employed. The toughness(work-to-fracture) of these systems displays a surprising deformation-protocoldependence; different association parameters optimize different properties. Inparticular, "strong, slow" SBs optimize strength, while "weak, fast" SBsoptimize ductility via self-healing during deformation. We relate theseobservations to breaking, reformation, and partner-switching of SBs duringdeformation. These studies point the way to creating associating-polymernetwork glasses with tailorable mechanical properties.

Nonlinear mechanics of thermoreversibly associating dendrimer glasses