The main chain of silicone rubber is composed of Si-O-Si links, which has high Si-O-Si bond energy, high temperature resistance and good properties; The side chain is an organic group with large bond angle, large degree of freedom of orientation, good flexibility and excellent low temperature resistance.

Damping mechanism of silicone rubber

When polymer viscoelastic materials are subjected to stress and strain, the bent molecular chains will be stretched, bent and other deformation, and the molecular chains will also twist and slip. After the external force disappears, the elastic part makes part of the molecular chain return to its original position, while the viscous part makes the slip between the chain segments can not be completely restored, resulting in permanent deformation, so that part of the energy is consumed in the form of heat.

Application of silicone rubber damping material

Silicone rubber has stable mechanical and damping properties in a large temperature range, excellent high and low temperature resistance and aging resistance, and can adapt to the working environment of aerospace products. With the emergence of new high damping silicone rubber and the application of new blending technology, silicone rubber is gradually replacing butyl rubber as the first choice in aerospace damping structure.

The piezoelectric damping materials were prepared by using phenyl silicone rubber as matrix, adding polyaniline coated lead titanate (PZT) and conductive carbon black. This kind of material is also called intelligent damping silicone rubber. It has excellent conductivity. When a certain amount of charge appears on the surface of PZT, polyaniline can collect more charge and transport the charge to the carbon black conductive network to improve the charge conduction efficiency.

I believe that with the development of science and technology, more and more silicone rubber damping materials will be used in our life.