|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Recent Advances in Printed Electronics and Additive Manufacturing: 2D/3D Functional Materials, Fabrication Processes, and Emerging Applications
||Engineered Low Density Polymers Within Additively Manufactured Polyacrylates
||Elbert Caravaca, David T. Bird, Katlyn Hanson, Nuggehalli M. Ravindra
|On-Site Speaker (Planned)
Foamed polymers are widely used as shock absorption and packaging materials. Typical foamed densities vary from 0.1 g/cm3 to 0.4 g/cm3. There is a need to explore foaming densities above 0.4 g/cm3 for propellants with highly engineered surface area for increased combustion performance. One way to achieve this is through highly controlled and engineered foam structures. The target of this work is to couple an ambient foaming method with additive manufacturing, specifically Vat-photopolymerization processing, to generate engineered foamed structures. In order to generate foam structures without the use of pressure or elevated temperature, alternate means of foaming are required. One method uses a chemical blowing agent, NaHCO3 and induces decomposition during the 3D printing process at ambient conditions. The second method uses an acid generator that relies on photosensitization of diaryliodonium salts via photoredox induced fragmentation mechanism to decompose CaCO3 at the optimal wavelength.