Estimating the reaction onset for porous polymer systems

Fredenburg, Anthony; Coe, Joshua D.; Maerzke, Katie A.; Lang, John M.; Dattelbaum, Dana M.; Sandoval, Diego R.

doi:10.1063/1.5044860

Cited by 4 publications

(1 citation statement)

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“…The concepts discussed above will be used to interpret results obtained for the following materials: solid and porous (foamed) polyurethane [6,13,47,48,57,58], Epon- and Jeffamine-based epoxies [59,60], carbon fiber-filled phenolic (CP) and cyanate ester (CE) composites [5,60,61], and filled polydimethylsiloxane foam (SX358) [62,63]. These materials have been studied extensively over the last decade at Los Alamos National Laboratory, and represent solid-density unfilled polymers, polymer-filler composites, and two types of polymer foams.…”

Section: Methodsmentioning

confidence: 99%

Shock-Driven Decomposition of Polymers and Polymeric Foams

Dattelbaum

Coe

2019

Polymers

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Polymers and foams are pervasive in everyday life, as well as in specialized contexts such as space exploration, industry, and defense. They are frequently subject to shock loading in the latter cases, and will chemically decompose to small molecule gases and carbon (soot) under loads of sufficient strength. We review a body of work—most of it performed at Los Alamos National Laboratory—on polymers and foams under extreme conditions. To provide some context, we begin with a brief review of basic concepts in shockwave physics, including features particular to transitions (chemical reaction or phase transition) entailing an abrupt reduction in volume. We then discuss chemical formulations and synthesis, as well as experimental platforms used to interrogate polymers under shock loading. A high-level summary of equations of state for polymers and their decomposition products is provided, and their application illustrated. We then present results including temperatures and product compositions, thresholds for reaction, wave profiles, and some peculiarities of traditional modeling approaches. We close with some thoughts regarding future work.

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Section: Methodsmentioning

confidence: 99%

Shock-Driven Decomposition of Polymers and Polymeric Foams

Dattelbaum

Coe

2019

Polymers

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Polysulfone shock compressed above the decomposition threshold: Velocimetry and modeling of two-wave structures

Huber

Peterson

Coe

et al. 2020

Journal of Applied Physics

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Polysulfone was shock loaded to pressures of 14.6–26.2 GPa in a series of gas gun-driven plate-impact experiments measuring material response with embedded electro-magnetic particle velocity gauges and optical velocimetry. The embedded electro-magnetic particle velocity gauges did not show a distinct two-wave structure but did show rounding that suggested a reaction but not a distinct separation of the reactants and product waves. In contrast, the transmission experiments fielded with optical velocimetry, with product pressures ranging from 21.0 to 26.2 GPa, showed well-defined two-wave structures due to shock-driven chemical decomposition of the polymer to products at a higher density. Distinct two-wave structures have not previously been published in literature during polymer compression; here, we observed these two-wave structures at both the polymer/lithium fluoride and polymer/polymethylmethacrylate interfaces. Hydrodynamic simulations of the experiments were performed using a newly constructed SESAME equation of state (EOS) for the polymer, a thermochemical EOS for the decomposition products, and an Arrhenius reaction rate model for the kinetics of the reaction. Simulation results also demonstrated two-wave structures but were unable to quantitatively reproduce either the embedded gauge or optical velocimetry data.

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Hydrodynamic simulations of shock-driven chemistry in polyimide

Peterson

Coe

2020

SHOCK COMPRESSION OF CONDENSED MATTER - 2019: Proceedings of the Conference of the American Physical Society Topical Group on S

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Estimating the reaction onset for porous polymer systems

Cited by 4 publications

References 1 publication

Shock-Driven Decomposition of Polymers and Polymeric Foams

Shock-Driven Decomposition of Polymers and Polymeric Foams

Polysulfone shock compressed above the decomposition threshold: Velocimetry and modeling of two-wave structures

Hydrodynamic simulations of shock-driven chemistry in polyimide

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