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Title: Large-scale Additive Manufacturing of Highly Exothermic Reactive Polymer Systems

Abstract

Additive manufacturing (AM) of reactive polymer systems involves the deposition of materials at room temperature that either cure during printing through a chemically initiated reaction or require thermal initiation after printing. This presentation focuses on large-scale AM of chemically initiated thermosetting resins to characterize the effects of heat generation, temperature-dependent viscoelasticity, and crosslinking on the printing process. Real-time tracking of both temperature and cure fronts during the build process were investigated using infrared (IR) and optical vision systems in combination with selected material dyes. Heat generation within the previously-deposited layers was observed to cause significant reduction in the storage modulus (G’) and viscosity of newly-deposited layers, resulting in bead instabilities and failure of the print. Quantitative experimental observations on thin-wall structures suggest strategies for mitigating this failure mode through selection of print parameters and tailoring of viscoelastic properties of the feedstock resin.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1546499
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: SAMPE 2019 - 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

Citation Formats

Romberg, Stian, Hershey, Christopher, Lindahl, John, Carter, William, Compton, Brett G., and Kunc, Vlastimil. Large-scale Additive Manufacturing of Highly Exothermic Reactive Polymer Systems. United States: N. p., 2019. Web. doi:10.33599/nasampe/s.19.1616.
Romberg, Stian, Hershey, Christopher, Lindahl, John, Carter, William, Compton, Brett G., & Kunc, Vlastimil. Large-scale Additive Manufacturing of Highly Exothermic Reactive Polymer Systems. United States. doi:10.33599/nasampe/s.19.1616.
Romberg, Stian, Hershey, Christopher, Lindahl, John, Carter, William, Compton, Brett G., and Kunc, Vlastimil. Wed . "Large-scale Additive Manufacturing of Highly Exothermic Reactive Polymer Systems". United States. doi:10.33599/nasampe/s.19.1616. https://www.osti.gov/servlets/purl/1546499.
@article{osti_1546499,
title = {Large-scale Additive Manufacturing of Highly Exothermic Reactive Polymer Systems},
author = {Romberg, Stian and Hershey, Christopher and Lindahl, John and Carter, William and Compton, Brett G. and Kunc, Vlastimil},
abstractNote = {Additive manufacturing (AM) of reactive polymer systems involves the deposition of materials at room temperature that either cure during printing through a chemically initiated reaction or require thermal initiation after printing. This presentation focuses on large-scale AM of chemically initiated thermosetting resins to characterize the effects of heat generation, temperature-dependent viscoelasticity, and crosslinking on the printing process. Real-time tracking of both temperature and cure fronts during the build process were investigated using infrared (IR) and optical vision systems in combination with selected material dyes. Heat generation within the previously-deposited layers was observed to cause significant reduction in the storage modulus (G’) and viscosity of newly-deposited layers, resulting in bead instabilities and failure of the print. Quantitative experimental observations on thin-wall structures suggest strategies for mitigating this failure mode through selection of print parameters and tailoring of viscoelastic properties of the feedstock resin.},
doi = {10.33599/nasampe/s.19.1616},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {5}
}

Conference:
Other availability
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