Use of latent metathesis polymerization systems for photopolymerization-based additive manufacturing
| DWPI Title: Preparing photopolymerization-based additive involves providing resin bath containing a metathesis-active monomer, photosensitizer and photolatent metathesis catalyst, polymerizing monomer, photoirradiating resin bath, activating catalyst and forming photopolymer layer, repeating irradiating step |
| Abstract: Photolatent olefin metathesis catalysts can be used in combination with metathesis-active monomers or resins for photopolymerization-based additive manufacturing via ring-opening metathesis polymerization (ROMP). A variety of alternative catalysts and photosensitizers are commercially available that allows for tuning of thermomechanical properties, potlifes, activation rates, and irradiation wavelengths. As an example, two optimized catalyst/photosensitizer systems were demonstrated in the rapid stereolithographic printing of complex, multidimensional poly-dicyclopentadiene structures with microscale features under ambient conditions. |
| Use: Method is used for preparing photopolymerization-based additive. |
| Advantage: The method enables preparing photopolymerization-based additive, using latent metathesis polymerization systems, such that photoabsorbers of resin, prevent unwanted cure and improve resolution by increasing concentration of photosensitizers, without requiring an additional photoabsorber. |
| Novelty: Preparation of photopolymerization-based additive, involves: 1) providing a bath of liquid resin containing a metathesis-active monomer, a photosensitizer, and a photolatent metathesis catalyst that can be activated by a light to initiate ring-opening metathesis polymerization (ROMP) of metathesis-active monomer; 2) irradiating the bath of liquid resin with a directed light exposure, to activate the photolatent metathesis catalyst and initiate ROMP of metathesis-active monomer, and form a layer of photopolymer; and 3) repeating the irradiating step to build a printed object layer-by-layer. |
| Filed: 6/2/2022 |
| Application Number: US17830632A |
| Tech ID: SD 15536.2 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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