Abstract: The composite damping materials based on the siliconecontaining styreneacrylate emulsion and hollow glass microspheres with two different particle sizes were prepared in this work, and their chemical structure and damping properties were studied by Fouriertransform infrared spectroscopy and dynamic mechanical analysis. The morphology of damping materials was investigated by scanning electron microscopy. The results indicated that the hollow glass microspheres with larger size were much easier to be damaged, although they had a better interfacial adhesion with the latex matrix. The combination of these two types of glass microspheres improved the mechanical performance of the damping materials effectively. Most of all, the composite damping materials achieved optimum damping properties when 15 wt % of mixed hollow glass microspheres were incorporated into the composites at a weight ratio of 1：1 for largesized and smallsized glass microspheres.

Key words: silicone-containing styrene–acrylate emulsion, composite damping material, hollow glass bead, mechanical property, damping property