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Capturing Polymer Chain Compression and Shock Driven Decomposition of Polytetrafluoroethylene During Dynamic Shock Compression with In Situ X-Ray Diffraction

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Abstract

Observations of unit cell compression or decomposition during dynamic shock loading requires the implementation of a probe capable of penetrating an opaque and evolving sample at elevated pressures and temperatures. By pairing synchrotron generated high energy X-rays and gas gun driven plate impact, we were able to study the evolution of the structure in polytetrafluoroethylene (PTFE) at pressures spanning 1.84–52.9 GPa. Under the planar, one-dimensional, shockwave, the polymer was forced into an anisotropic conformation, in which the polymer chains assembled parallel to the shockwave. PTFE initially has a hexagonal crystal structure (Phase IV), once it was compressed above ~0.5 GPa it had a conformational change to the orthorhombic crystal structure (Phase III). The compression of the polymer chains was observed by X-ray diffraction, where the PTFE (110) peak shifted to higher q with increased pressure; polymer chain compression was still observed at 30.0 GPa. The highest pressure shot, at 52.9 GPa, above the reactants to products transition region, showed no new carbon species formation within the given time window and q-range. By following the orthorhombic lattice diffraction peak, we were able to calculate the Hugoniot loci of the crystalline and amorphous parts for each dynamic event (LA-UR-22-31436).

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Acknowledgements

The results in this work were supported by the DOE/NNSA Dynamic Materials Properties Campaign. This publication is based upon work performed at the Dynamic Compression Sector, which is operated by the Washington State University under the U.S. Department of Energy (DOE)/National Nuclear Security Administration Award No. DE-NA0003957. This research used resources of the Advanced Photon Source, a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. This work was conducted at Los Alamos National Laboratory, an affirmative action/equal opportunity employer, which is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under Contract No. DE-AC52- 06NA25396.

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Authors and Affiliations

  1. Dynamic Experiments Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM, 87545, USA

    R. C. Huber, D. M. Dattelbaum, B. D. Bartram & L. L. Gibson

  2. MPA-11, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM, 87545, USA

    E. B. Watkins

  3. Office of Experimental Science, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM, 87545, USA

    J. L. Jordan & E. N. Brown

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  1. R. C. Huber
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Huber, R.C., Watkins, E.B., Jordan, J.L. et al. Capturing Polymer Chain Compression and Shock Driven Decomposition of Polytetrafluoroethylene During Dynamic Shock Compression with In Situ X-Ray Diffraction. J. dynamic behavior mater. (2023). https://doi.org/10.1007/s40870-023-00391-w

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