3D printable tough silicone double networks.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32778657.
- Also identified by DOI 10.1038/s41467-020-17816-y and PMC identifier 7417997.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Additive manufacturing permits innovative soft device architectures with micron resolution. The processing requirements, however, restrict the available materials, and joining chemically dissimilar components remains a challenge. Here we report silicone double networks (SilDNs) that participate in orthogonal crosslinking mechanisms-photocurable thiol-ene reactions and condensation reactions-to exercise independent control over both the shape forming process (3D printing) and final mechanical properties. SilDNs simultaneously possess low elastic modulus (E<sub>100%</sub> < 700kPa) as well as large ultimate strains (dL/L<sub>0</sub> up to ~ 400 %), toughnesses (U ~ 1.4 MJ·m<sup>-3</sup>), and strengths (σ ~ 1 MPa). Importantly, the latent condensation reaction permits cohesive bonding of printed objects to dissimilar substrates with modulus gradients that span more than seven orders of magnitude. We demonstrate soft devices relevant to a broad range of disciplines: models that simulate the geometries and mechanical properties of soft tissue systems and multimaterial assemblies for next generation wearable devices and robotics.
Medical subject headings
- Materials Testing
- Printing, Three-Dimensional
- Silicones