How does the elastic recovery of fluorosilicone change under repeated deformation?
Publish Time: 2024-12-04
As a special fluorosilicone rubber mixture, the elastic recovery of fluorosilicone is of vital importance in many application scenarios, especially when it undergoes repeated deformation.In the initial stage, fluorosilicone shows good elastic recovery due to its unique molecular structure. Its molecular chain has a certain flexibility and elasticity. When it is stretched or compressed by a small external force, it can quickly rebound to a state close to its original state. This is because the intermolecular forces of fluorosilicone and the entanglement and disentanglement of the molecular chain are relatively flexible, so that the elastic potential energy stored in the material during deformation can be effectively converted into the power to restore the deformation.However, with the increase in the number of repeated deformations, the elastic recovery of fluorosilicone will gradually change. On the one hand, the molecular chain may produce local slippage and orientation changes during the continuous stretching and retraction process. Some originally regular molecular chains may become disordered, resulting in the interaction between the molecular chains being affected, thereby reducing the elastic recovery force. For example, in some fluorosilicone seal applications that are frequently bent and deformed, after long-term use, it is found that its sealing performance gradually decreases, which is closely related to the weakening of elastic recovery ability.On the other hand, repeated deformation may also cause damage to the microstructure. In high stress areas, molecular chains may break or crosslinking points may be destroyed, which further weakens the overall elastic recovery performance of the material. Moreover, environmental factors such as temperature and humidity will also have a synergistic effect on the elastic recovery ability of fluorosilicone under repeated deformation. In a high temperature environment, the thermal motion of the molecular chain intensifies, which may accelerate the aging and damage of the molecular chain, resulting in a faster attenuation of the elastic recovery ability; while in a high humidity environment, moisture may invade the material and affect the interaction between molecules, which is also not conducive to elastic recovery.In order to improve the elastic recovery ability of fluorosilicone under repeated deformation, the molecular structure can be stabilized by optimizing the formula design and adding suitable reinforcing agents or crosslinking agents; the processing technology can also be improved to reduce defects and stress concentration inside the material. In-depth research on the law of changes in the elastic recovery ability of fluorosilicone under repeated deformation will help to better develop and apply this material, so that it can play a better performance in many fields such as aerospace, automobile manufacturing, and electronic appliances.
