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A team from Lawrence Livermore National Laboratory (LLNL) simulated the networking of 3D printed polymer networks. This is an important step in the development of new functional resins for light-based 3D printing techniques, including two-photon lithography (TPL). and volumetric additive manufacturing (VAM).
The team used molecular dynamics simulations to study, at the microscopic level, the kinetics and topology of three different molecules of the same reactive group (acrylate) but containing different non-reactive components. The researchers found that the differences in the dynamics and structure of the resulting crosslinked polymers made using the TPL and VAM processes were due to differences in the non-reactive parts of the molecules. The research appears in the October 15 issue of Journal of Physical Chemistry B. and is offered online as additional coverage.The researchers said the knowledge gained from the study will open the door to rationally designed photoresists and help them find new custom photosensitive resins that can push the boundaries of VAM developed by TPL and LLNL. These techniques create 3D objects by projecting structured light in liquid resins, causing them to harden at desired points in seconds. The resins used in these processes often contain different molecules with the same reactive functional groups and their formulation is based on trial and error methods, with the results treated as trade secrets.
“Our combination of molecular dynamics simulations and mathematical graph theory allows us to modify or disrupt the chemistry and physics of the molecules that serve as building blocks in AM techniques such as TPL and VAM and see the effects on the resulting polymer,” he said. explained John Karnes. the lead author of the article. “Since we can see every atom in these simulations, we begin to develop an insight that bridges the gap between microscopic network topology and macroscopic behavior; B. Understanding the relationship between intramolecular loops or cycles and where the liquid resin gels the solid molded part. ”
LLNL materials scientist Jürgen Biener said the team continues to research longer lengths and time scales, simulate mechanical testing of printed parts, and model other types of curing that are of interest to LLNL.
New materials expand volumetric 3D printing
More information:
John J. Karnes et al. On the network topology of cross-linked acrylate photopolymers: a case study on molecular dynamics, Das Journal of Physical Chemistry B. (2020). DOI: 10.1021 / acs.jpcb.0c05319
Provided by Lawrence Livermore National Laboratory
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