Understanding and Developing Dual-Wavelength Olefin Metathesis Polymerizations for the Rapid, Continuous Additive Manufacturing of High-Performance Thermosets

This report details the goals, approach, results, and future needs of a three-year Laboratory Directed Research and Development project funded by Sandia’s Materials Science Research Foundation. In this project, we established basic principles and mechanistic understanding of orthogonal or sequential chemistries for fabricating multi-material or robust materials. We developed numerous additive manufacturing, or 3D-printing, techniques including volumetric solid-state printing, dual-wavelength printing, and lithographic regulation of polymer crystallinity. We leveraged these new printing motifs to expand upon what is possible with manufacturing to give bespoke optical and mechanical performance. Moreover, we discovered new techniques for depolymerization enabling recovery of pristine carbon-fiber and high value electronics under moderate conditions.. Authors: Appelhans, Leah [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000221359173); Leguizamon, Samuel Carlos [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000333956562); Commisso, Alex Joseph [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000288255029). DOE Contract: NA0003525. Subjects: 36 MATERIALS SCIENCE