PIEZOELECTRIC DISPERSION TYPE ORG. COMPOSITE DAMPING MATERIAL

摘要

PROBLEM TO BE SOLVED: To obtain a damping material having a loss factor tanδof 1 or more and low strain amplitude dependence. SOLUTION: The material comprises an org. dielectric or ferroelectric dispersed in a non-dielectric polymer pref. in the form of needles. The length-to- diameter ratio of the dielectric or ferroelectric is over 5:1. If the diameter or cross section is rectangular, its one side is desirably 20 microns or less. The vol. ratio of the dielectric or ferroelectric to the non-dielectric is pref. 0.3-0.7:1. Thus a damping material having a tanδof 1 or more and low strain amplitude dependence and no need of the polarizing and electrode fixing steps and hence displays the effect in low-strain factor regions.