(1) High elasticity: The elastic modulus of rubber is small, generally 1-9.8Mpa. The elongation deformation is large, the elongation rate can be as high as 100%, and it still exhibits recoverable characteristics, and can maintain elasticity in a wide temperature range (-50-+150℃).
(2) It has viscoelasticity: rubber is a viscoelastic body. Due to the presence of macromolecular forces, the rubber is subjected to external forces and deformed by time, temperature and other conditions, showing obvious stress relaxation and creep phenomena , Under periodic action such as vibration or alternating stress, hysteresis loss occurs.
(3) It has a cushioning and damping effect: rubber has a softening effect on the transmission of sound and vibration. This feature can be used to prevent noise and vibration.
(4) Electrical insulation: rubber and plastic are electrically insulating materials. For example, natural rubber and butyl rubber and volume resistance can reach 10.
(5) Temperature dependence: Polymer materials are generally affected by temperature. Rubber becomes hard and brittle in a glassy state at low temperatures, and softens, melts, thermally oxidizes, thermally decomposes, and even burns at high temperatures.
(6) It has aging phenomenon: Just like metal corrosion, wood decay, and rock weathering, rubber will also age due to changes in environmental conditions, resulting in deterioration of performance and shortening of service life.
(7) Vulcanization must be carried out: The rubber must be added with sulfur or other materials that can vulcanize (or crosslink) the rubber to crosslink the rubber macromolecules into a spatial network structure, in order to obtain valuable rubber products, but thermoplastic rubber No need to vulcanize.
