Study On The Relationship Between Microstructure Of Polyurethane Elastomer And Vibration Transfer Properties

Polyurethane elastomers (PUE) can be found in a variety of products that feature a range of properties and performance. Polyurethane elastomer has attracted many researchers'interests in vibration isolation and damping vibration due to its special structure with phase separation, and there are few literature reporting the relationship between the structure of polyurethane elastomer and the vibration transfer characteristics. To solve above problems,the aim of this paper is to design the different structure of the crosslinked polyurethane elastomer, and this paper studies the effects of the special structure with phase separation on the vibration transfer characteristics of polyurethane elastomer, creating a test equipment of vibration isolation according to national standard.The molecular weight, structure and mixture of soft segment have a large impact on the performance of polyurethane elastomer. With the increase of the soft segment's molecular weight, the hydrogen bonds' amounts and crystallization degree of polyurethane elastomer enhance. Under the influence of these two factors, mechanical property, performance of vibration isolation and damping performance could also change. At the same time, the regularity,polarity,and side chain could also affect the the hydrogen bonds' amounts,too.The series of polyurethane elastomer samples based on different proportions of two polyols can be very different.The structure and isomer content of isocyanate affect of hydrogen bond density in polyurethane elastomer materials. Compared with TDI100-PU, TDI80-PU has better mechanical performance, the poor performance of vibration isolation and damping performance. Also, the different structures of isocyanate can lead to the difference in the hydrogen bond of polyurethane elastomer,the mechanical properties of aliphatic polyurethane elastomer is worse than aromatic polyurethane elastomer material, also have better behavior in damping performance and better performance of vibration isolation.The flexible group, side chain, length of chain extender will impact the state of hard-segment in the polyurethane elastomer. Space location-obstruct effect may enhance by introducing side chain group to chain extender, which may cause deterioration in material mechanics performance, the better damping performance and the better performance of vibration isolation. The longer the chain extender is, the bigger mass of hard-segment will be,the mechanical properties of materials, and the performance of vibration isolation and damping properties will be very different.The structure of crosslinking agent and the crosslinking density have a certain degree of influence on the properties of the crosslinks in the polyurethane elastomer. The activity and the position of the terminal hydroxyls of crosslinking agent has a certain degree of influence on hydrogen bond density, mechanical properties,performance of vibration isolation and damping performance of polyurethane elastomer. With the change of the addition of crossing agent, the crosslinking density of polyurethane elastomer is differernt, the amount of hydrogen bonds in the polyurethane elastomer is identical,but there are differences between the performance of the polyurethane elastomer.