How can the frictional properties of rubber improve?
The viscoelastic parameter tan delta has a direct influence on the friction force, while the decrease of the rubber cross degree makes the tan delta increase. Therefore, the friction coefficient increases, and the friction coefficient and wear increase as well. From a physical and chemical point of view, the weaker the cross-linking, the higher the rate of wear is due to a lower degree of cross-linking which is easily caused by mechanical stress. It is found that the crosslinking degree of ethylene propylene three - element rubber increases with the irradiation of electron beam, which reduces the friction.
The free energy of rubber surface determines the size of the interaction force between rubber and duality, and then affects the adhesive friction of rubber. Generally speaking, the friction coefficient increases with the increase of surface free energy.
Because of its high elasticity and low modulus, the friction and wear properties of rubber are greatly affected by their physical and mechanical properties. The hardness of rubber is smaller, contacting with a rigid object, the real contact area is large, and the real size of the contact area is an important factor, so the friction rubber hardness, have more effect on the friction performance.
