Abstract:
Natural structures utilize patterning of both hard and soft materials across multiple length scales to produce robust and functional materials. The development of synthetic platforms capable of spatially patterning mechanical properties into polymer materials is a critical challenge in the development of next-generation manufacturing and the production of bio-inspired materials. To this end, the synthesis of an orthogonally initiated interpenetrating polymer network system is presented. The kinetics and initiation of each network are independently controlled, allowing for tuning of final network morphology and/or crosslinking density. The effect of differences in morphology on fracture toughness and modulus are investigated, with final properties ranging over three orders of magnitude. The use of light as a stimulus allows for spatial patterning of mechanical properties within a chemically uniform sample. Macroscopic, multi-mechanical structures are produced, and emergent mechanical properties are explored.