Extrusion Deposition Additive Manufacturing Utilizing High Glass Transition Temperature Latent Cured Epoxy Systems

Conference · Mon Apr 01 00:00:00 EDT 2019

DOI:https://doi.org/10.33599/nasampe/s.19.1615· OSTI ID:1558534

Lindahl, John  ^[1]; Hershey, Christopher ^[1]; Gladysz, Gary ^[2]; Mishra, Vinay ^[2]; Shah, Karana ^[2]; Kunc, Vlastimil  ^[1]

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1. ORNL
2. Dixie Chemical Company

This paper investigates the formulation, chemo-rheological properties, and extrusion deposition additive manufacturing (AM) of high glass transition temperature epoxies. Currently there are two methods of using thermoset materials in extrusion deposition AM. The first approach uses a reactive material that will fully cross-link during the build process. The second approach, which is explored in this paper, uses a reactive material that requires a thermal curing cycle after deposition is completed. Yield stress fluids for successful deposition were produced by blending various ratios of rheology modifying fillers into latent curing epoxy systems. After analyzing the rheological properties of the various blends via shear, temperature, and cure rate, the preferred formulation was selected. Test specimens for flexural analysis and dynamic mechanical analysis were printed from down selected combinations. This work resulted in the identification of key parameters for printing latent cured epoxy systems that will be scaled for the first large scale 3D printed epoxy for composite tooling applications.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1558534
• Resource Relation: Conference: SAMPE 2019 Conference & Exhibition - Charlotte, North Carolina, United States of America - 5/20/2019 4:00:00 AM-5/23/2019 4:00:00 AM
• Country of Publication: United States
• Language: English