The Research On High Damping Polyurethane Elastomer

The development of damping materials was began in 1950s,when they were used in sound and vibrationg damping areas.Damping materials were novel functional materials that were efficient in converting sound and mechanical vibration energy into heat that resulted in absorption. Polyurethanes were particularly attractive for a study of the effect of chemical structure on damping because it was possible to change their glass transitions over a wide range of temperature by transform of the ratio of hard and soft segments.There were two metheods which were always been used to improve the damping properties of polyurethanes. One of the major methods was to design macromolecular polymer structure. Another one was IPN technique. However,the PU elastomer synthesized by IPN technique had low intensity,that can not be used for high-intensity areas.In this paper,the damping properties and mechanical properties of many kind of PU elastomer had been studied such as polyester PU elastomer,polyether PU elastomer and so on.Self-made sample was selected to synthesized PU elastomer and we have studied the effect of curing temperature,hard segment,chain extender and frequency on the damping properties and mechanical properties of the PU elastomer. Block and grafting methods were used to improve the properties of PU elastomer and adjust the temperature range at tanδ>0.3 .The results showed that:After sample 1 were mixed with self-made softener, the damping temperature domain of PU elastomer moving to the low-temperature clearly so that it covers the room temperature range. With the increase of grafting-rate, the damping properties of PU elastomer was improved obviously, at the same time the mechanical properties of PU elastomer decreased.When the grafting-rate was 10%, the integrated Performance of PU elastomer is better.