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首页> 美国卫生研究院文献>ACS Omega >Shape Memory Polyurethane-Based Smart Polymer Substrates for PhysiologicallyResponsive Dynamic Pressure (Re)Distribution
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Shape Memory Polyurethane-Based Smart Polymer Substrates for PhysiologicallyResponsive Dynamic Pressure (Re)Distribution

机译：基于形状记忆聚氨酯的智能聚合物基质响应式动态压力（再）分布

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摘要

Shape memory polymers (SMPs) are an exciting class of stimuli-responsive smart materials that demonstrate reactive and reversible changes in mechanical property, usually by switching between different states due to external stimuli. We report on the development of a polyurethane-based SMP foam for effective pressure redistribution that demonstrates controllable changes in dynamic pressure redistribution capability at a low transition temperature (∼24 °C)—ideally suited to matching modulations in body contact pressure for dynamic pressure relief (e.g., for alleviation or pressure ulcer effects). The resultant SMP material has been extensively characterized by a series of tests including stress–strain testing, compression testing, dynamic mechanical analysis, optical microscopy, UV–visible absorbance spectroscopy, variable-temperature areal pressure distribution, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, differential scanning calorimetry, dynamic thermogravimetric analysis, and 1H nuclear magnetic resonance spectroscopy. The foam system exhibits high responsivity when tested for plantar pressure modulationwith significant potential in pressure ulcers treatment. Efficientpressure redistribution (∼80% reduction in interface pressure),high stress response (∼30% applied stress is stored in fixityand released on recovery), and excellent deformation recovery (∼100%)are demonstrated in addition to significant cycling ability withoutperformance loss. By providing highly effective pressure redistributionand modulation when in contact with the body’s surface, thisSMP foam offers novel mechanisms for alleviating the risk of pressureulcers.
机译：形状记忆聚合物（SMP）是一类令人兴奋的刺激响应型智能材料，通常通过外部刺激在不同状态之间切换，从而表现出机械性能的反应性和可逆性变化。我们报告了用于有效压力重新分配的聚氨酯基SMP泡沫的开发情况，该泡沫证明了在较低的转变温度（〜24°C）下动态压力重新分配能力的可控变化-非常适合匹配人体接触压力的调制以减轻动态压力（例如，缓解或压疮的效果）。所得的SMP材料已经通过一系列测试进行了广泛表征，包括应力应变测试，压缩测试，动态力学分析，光学显微镜，紫外可见吸收光谱，可变温度面压分布，傅立叶变换红外光谱，拉曼光谱， X射线衍射，差示扫描量热法，动态热重分析和 1 H核磁共振波谱。当进行足底压力调节测试时，泡沫系统显示出高响应度在压疮治疗方面具有巨大潜力。高效的压力重新分布（界面压力降低约80％），高应力响应（约30％的施加应力固定存储并在恢复时释放）和出色的变形恢复（〜100％）除了具有显着的骑行能力外，还得到了证明性能损失。通过提供高效的压力重新分配与身体表面接触时的调制SMP泡沫提供了减轻压力风险的新颖机制溃疡。

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