Gamma radiation effects on siloxane-based additive manufactured structures

Schmalzer, Andrew M.; Cady, Carl M.; Geller, Drew; Ortiz-Acosta, Denisse; Zocco, Adam T.; Stull, Jamie; Labouriau, Andrea

doi:10.1016/j.radphyschem.2016.07.020

Gamma radiation effects on siloxane-based additive manufactured structures

Journal Article · Wed Aug 03 00:00:00 EDT 2016 · Radiation Physics and Chemistry (1993)

DOI:https://doi.org/10.1016/j.radphyschem.2016.07.020· OSTI ID:1458926

^[1]; ^[1]; ^[1]; Ortiz-Acosta, Denisse ^[1]; Zocco, Adam T. ^[1]; ^[1]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Siloxane-basedadditive manufactured structures prepared by the direct ink write (DIW) technology were exposed to ionizing irradiation in order to gauge radiolysis effects on structure-property relationships. These well-defined 3-D structures were subjected to moderate doses of gamma irradiation in an inert atmosphere and characterized by a suite of experimental methods. Changes in thermal, chemical, microstructure, and mechanical properties were then evaluated by DSC, TGA, FT-IR, mass spectroscopy, EPR, solvent swelling, SEM, and uniaxial compressive load techniques. Our results demonstrated that 3-D structures made from aromatic-free siloxane resins exhibited hardening after being exposed to gamma radiation. This effect was accompanied by gas evolution, decreasing in crystallization levels, decreasing in solvent swelling and damage to the microstructure. Furthermore, long-lived radiation-induced radicals were not detected by EPR methods. Our results are consistent with cross-link formation being the dominant degradation mechanism over chain scission reactions. On the other hand, 3-D structures made from high phenyl content siloxane resins showed little radiation damage as evidenced by low off gassing.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: NNSA Kansas City National Security Campus (KCNSC)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1458926

Alternate ID(s):: OSTI ID: 1400420

Report Number(s):: LA-UR--16-20532

Journal Information:: Radiation Physics and Chemistry (1993), Journal Name: Radiation Physics and Chemistry (1993) Journal Issue: C Vol. 130; ISSN 0969-806X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
42 ENGINEERING
Additive manufacturing
DIW resin
Polysiloxanes
Radiolysis

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References (26)

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