Molecular dependencies of dynamic stiffening and strengthening through high strain rate microparticle impact of polyurethane and polyurea elastomers
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2019APL.pdf
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583.63 KB
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Author(s)
Sun, Yuchen
Wu, You-Chi Mason
Veysset, David Georges
Kooi, Steven E
Hu, Weiguo
Swager, Timothy M
Nelson, Keith Adam
Hsieh, Alex J
Date Issued
August 27, 2019
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Sun, Yuchen et al. "Molecular dependencies of dynamic stiffening and strengthening through high strain rate microparticle impact of polyurethane and polyurea elastomers." Applied Physics Letters 115, 9 (2019): 093701 © 2019 AIP Publishing
Version
Author's final manuscript
Abstract
This study investigates the molecular dependencies of dynamic stiffening and strengthening through comparison of high strain rate impact responses of various polyurethanes and polyureas. We use an in-house designed tabletop microimpact experimental platform—the laser-induced particle impact test—to perform high strain rate impacts and measure the corresponding material response. Dynamic mechanical analysis and differential scanning calorimetry are used to show that glass transition temperature is a useful predictor of the impact response at ambient temperatures. Meanwhile, solid-state nuclear magnetic resonance spectroscopy identifies segmental dynamics as an important determinant of the variation in both dynamic stiffening and strengthening. The impact responses of polyurethanes and polyureas both show clear dependencies on the molecular weight of the soft segment. This comparison suggests the state of intermolecular hydrogen bonding plays a key role in dynamic stiffening and strengthening. This study aims to identify the molecular dependencies of the impact response and establish a foundation for further design and testing of optimal high strain rate characteristics in synthetic elastomers. Keywords: materials analysis; impact testing; lasers; microscopy; velocity measurement; nuclear magnetic resonance; spectroscopy; polymers; mechanical testing
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1063/1.5111964
