Rubber is an organic polymer material with a molecular weight of several hundred thousand. It is divided into four aspects from other industrial materials: one can maintain high elasticity in a wide temperature range (-50~150 °C; the second is low modulus of elasticity, 3 orders of magnitude lower than ordinary materials, the third is The deformation is large, the elongation is up to 1000% (the general material is less than 1%); the fourth is the exothermic heat during stretching, while the general material absorbs heat; the fifth is that the elasticity increases with the increase of temperature, and is also opposite to the general material.
It can be seen from the above that the properties of the elastomer and the rubber are basically overlapping. In a nutshell, it is “low modulus, high elongation, but the two are not completely equivalent, at least in the following two aspects:
1 The superior properties of rubber often need to be fully achieved by cross-linking (vulcanization), while some elastomers are not.
2 Some elastomer materials can be directly manufactured by plastic processing without the cooperation of conventional rubber processes such as compounding, vulcanization and vulcanization.
Therefore, the elastomer has a wider coverage than rubber, such as the thermoplastic elastomer SBS.