Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202002374
Keywords
3D printing; dynamic covalent polymer network; reprocessable crosslinked polymers; self-healing materials; shape memory polymers
Categories
Funding
- U.S. Combat Capabilities Development Command Army Research Laboratory [W911NF-16-2-0229, W911NF-18-2-0232, W911NF-19-2-0264]
Ask authors/readers for more resources
Soft materials with widely tailorable mechanical properties throughout the material's volume can shape the future of soft robotics and wearable electronics, impacting both consumer and defense sectors. Herein, a platform of 3D printable soft polymer networks with unprecedented tunability of stiffness of nearly three orders of magnitude (MPa to GPa) and an inherent capability to interbond is reported. The materials are based on dynamic covalent polymer networks with variable density of crosslinkers attached to prepolymer backbones via a temperature-reversible Diels-Alder (DA) reaction. Inherent flexibility of the prepolymer chains and controllable crosslinking density enable 3D printed networks with glass transition temperatures ranging from just a few degrees to several tens of degrees Celsius. Materials with an elastomeric network demonstrate a fast and spontaneous self-healing behavior at room temperature both in air and under water-a behavior difficult to achieve with other crosslinked materials. Reversible dissociation of DA networks at temperatures exceeding approximate to 120 degrees C allows for reprintability, while control of the stereochemistry of DA attachments enables reprogrammable shape memory behavior. The introduced platform addresses current major challenges including control of polymer interbonding, enhanced mechanical performance of printed parts, and reprocessability of 3D-printed crosslinked materials in the absence of solvent.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available