New environment-conscious material with low-frequency-sound absorption and comfortable sound characteristics using fiber-reinforced organic hybrid

为了获得具有更高减振性能的有机杂化材料，我们研究了影响有机杂化材料减振性能的因素以及无机填料如碳、二氧化硅颗粒和碳纤维的加入对其减振性能的影响。研究发现，除了聚合物和低分子材料本身的能量损失外，还受到聚合物和低分子相互作用的数量、强度和结构的影响。无机填料的加入改善了减振性能，这是由于填料与基质界面处的高能量损失造成的。无机填料的加入提高了材料的减振性能，但随低分子含量的增加而降低。这是因为在低分子含量较高时，由于低分子的流动性，所施加的机械能很难传递到填料表面。然而，无机填料的进一步加入恢复了机械能对填料表面的传递，导致了减振性能的提高。为了研究舒适性，我们估计了带和不带有机混合衬里的扬声器的输入信号和输出声音之间的传递函数。通过衬里有机杂化，我们观察到了在一定频率下传递函数的变化。我们假设传递函数的这种变化会影响舒适的声音特性。

We investigated the relationship between comfortable sound properties and damping characteristics of organic hybrid.In order to obtain organic hybrid with higher damping performance, we studied on factors determining damping performance of organic hybrid and influence on an addition of inorganic fillers such as carbon and silica particles and carbon fiber.It was found damping performance is influenced by amount, intensity and structure of interaction between polymer and low molecule, besides an energy loss by polymer and low molecule themselves.Addition of inorganic filler improved damping performance, resulting from high energy loss at the interface between filler and matrix. The increase in damping performance by addition of inorganic filler decreased with increasing content of low molecule. This is because an applied mechanical energy becomes difficult to transmit to the filler surface by fluidity of low molecule at higher content of low molecule. However, further addition of inorganic filler recovered transmission of mechanical energy to a filler surface, resulting in an increase in damping performance.For investigation of comfortable sound properties, we estimated a transfer function between input signal and output sound of a speaker lined with and without organic hybrid. By lining with organic hybrid, we observed a change in a transfer function at certain frequency. We supposed this change in a transfer function influenced on comfortable sound properties.