Preparation and properties of damping materials in multi-phase system

In this work, a series of the thermoplastic polyester elastomer (TPEE) filled with micro CaCO3 and hollow glass microspheres (HGM) via alloying process. Meanwhile, the processing-capability of composites was confirmed. SEM images showed that the CaCO3 was uniformly dispersed in TPEE matrix with ∼3 µm scale aggregates, while the HGM was slightly aggregated to ∼13 µm scale. The heterogeneous dispersion of micro-scale fillers strongly affected the sound transmission loss (STL) value of composites. The sound insulation property was measured by a four microphone impedance tube. Compared to pure polymer sample, both CaCO3 and HGM filled TPEE composite exhibited greatly enhanced soundproof efficiency. The damping of acoustic energy was contributed by the extended difference of the stiffness and acoustic impedance between hard segment and soft segment. The dispersion and property of inorganic fillers were considered for key roles to increase the dissipation of sound wave. Meanwhile, the mechanical of TPEE composites was enhanced due to the addition of inorganic fillers.