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<span style="color:#337FE5;" ><strong> Rubber elasticity and resilience </strong></span><br />
After the object is deformed by external force, the property that can restore the original shape when the force is removed is called elasticity; <br />
Resilience is a quantity used to describe the size of the elasticity. It is expressed as the time for the object to return to its original shape after applying force to the object under specified conditions, or the size of the rebound force. <br />
<span style="color:#337FE5;" ><strong> Factors affecting the resilience of rubber </strong></span><br />
Rubber is a highly elastic polymer material with reversible deformation, elastic at room temperature, can produce large deformation under a small external force, and can be restored to its original state after removing external force. <br />
Elastomeric resilience of rubber is a means of characterizing the recoverable elastic deformation of rubber under stress. The interaction between rubber molecules will hinder the movement of molecular chain segments. Part of the force acting on rubber molecules is used to overcome the viscous resistance between molecules, and the other part causes the deformation of molecular chain, which constitutes the viscoelasticity of rubber. So rubber has both high elasticity and viscosity. <br />
<strong><span style="color:#337FE5;" > Factors affecting the resilience of rubber </span></strong><br />
1. Rubber with large elongation and small permanent deformation has good elasticity. <br />
2. Rubber with large molecular weight has good elasticity. <br />
3. Rubber with narrow molecular weight distribution has good elasticity. <br />
4, molecular chain flexibility good rubber elasticity. <br />
5. The elasticity of rubber becomes worse after crystallization. &nbsp;  <br />
6, the intermolecular force is large, so that the elasticity is reduced. &nbsp; &nbsp; <br />
7. The maximum elasticity occurs with the increase of crosslinking density. The polysulfide bond has good elasticity. <br />
8, with high sulfur with low potency of the accelerator has better elasticity. &nbsp; <br />
9. Thiazole and sulfoamide accelerators have good elasticity. &nbsp; <br />
10. The resilience of NBR sulfur-free vulcanization system is higher than that of conventional vulcanization system. <br />
11. For NR, the vulcanized rubber with semi-effective vulcanization system has the best elasticity. The second is the common, effective vulcanization system. <br />
12, improving the rubber content is the most effective way to improve resilience. <br />
13. Add fillers with small particle size, large surface activity and high structure to reduce the resilience of rubber. <br />
14, the elasticity of the rubber material decreases with the increase of the amount of filler. However, when the amount of calcium carbonate and clay is not more than 30 parts, it has little effect on the elasticity. <br />
15. Softener reduces the elasticity of rubber (except EPDM)
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