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首頁(yè)> 外軍國(guó)防科技報(bào)告 >Molecular dependencies of dynamic stiffening and strengthening through high strain rate microparticle impact of polyurethane and polyurea elastomers;
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Molecular dependencies of dynamic stiffening and strengthening through high strain rate microparticle impact of polyurethane and polyurea elastomers;

機(jī)譯：動(dòng)態(tài)硬化和強(qiáng)化通過(guò)聚氨酯和聚脲彈性體的高應(yīng)變速率微粒影響的分子的依賴(lài)關(guān)系;

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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;

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  • 年(卷),期 2020(),
  • 年度 2020
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  • 總頁(yè)數(shù) 13
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