This study investigates the mechanical and damping properties of natural cork particle reinforced rigid polyurethane (PU) composite foams, and also the structure-properties relationship between their cellular microstructural morphology and their thermomechanical properties. The linear relation between reaction rate, cell size, and free rise density (FRD) of Cork/PU composite with respect to the cork loading fraction was experimentally observed and analytically confirmed. It was found that the cork particles could effectively tailor the static and dynamic viscoelastic properties of composite foams. Importantly, it was observed in the dynamic viscoelastic characterization that the Cork/PU composite foams exhibited the increase in both storage and loss moduli, which is typically compromised for each other. These results could provide broad insight and guidance in developing a novel polymeric foam with mechanical robustness and energy absorbing capability for various structural applications including electrical vehicle and drone, which requires both lightweight and strength/stiffness.

这项研究调查了天然软木颗粒增强硬质聚氨酯（PU）复合泡沫的力学和阻尼性能，以及它们的微结构形态与热力学性能之间的结构-性能关系。通过实验观察并分析确认了软木/聚氨酯复合材料的反应速率，泡孔大小和自由上升密度（FRD）相对于软木填充量的线性关系。发现软木颗粒可以有效地调节复合泡沫的静态和动态粘弹性质。重要的是，在动态粘弹性特征中观察到，Cork / PU复合泡沫材料的储能模量和损耗模量均增加，这通常是相互折衷的。