聚合物/无机粒子复合材料的隔声理论模型

应用声学原理分析了无机粒子填充聚合物复合材料的隔声行为，以更深入地揭示其隔声机理．在此基础上，建立了相关的数学模型，并预测了玻璃微珠填充聚乙烯复合材料的隔声性能．结果显示：隔声量与微珠体积分数之间呈线性关系；在较低的噪声频率下，隔声量对噪声频率的敏感性较强；当微珠含量一定时，隔声量随着微珠粒径的增加而下降．声波遇到粒子时发生反射、散射和折射等行为是复合材料隔声性能提高的主因．

Theoretical Sound-insulation Model of the Polymer/Inorganic Particle Composites

The sound insulation behaviors of the inorganic particle-filled polymer composites were analyzed by means of the acoustics theory with the purpose of revealing the sound insulation mechanisms of the composites. Based on the analysis, a relevant mathematical model was then established, and the sound insulation properties of the glass bead-filled polyethylene composite were finally predicted. The results indicate that there is a linear relationship between the capacity of sound insulation and the volume fraction of glass beads, and the capacity is significantly sensitive to the sound frequency. It is also indicated that with a constant volume fraction of glass beads, the capacity of sound insulation decreases with the increase of the bead size. The principal cause for the improvement of sound insulation property lies in the behaviors of reflection, scattering and refraction which occur under the condition of sound wave contacting the particles.