What are the other types of SBR?
Special space rubber polyisoprene and polybutadiene
The discovery that the Ziegler-Nata (Lithium alkyl) catalyst catalyzes the polymerization of isoprene or butadiene in such a way that the cis structure is mainly obtained made it possible to simulate natural rubber by synthesis. Polyisoprene (IR) rubber, which is quite similar to natural rubber, is even superior in some respects such as better color, more uniform quality, less odor, faster processability and mixing, better foaming and foil, excellent mold flow and controlled molecular weight. In contrast, tear strength, viscosity and tensile strength of natural rubber are higher. Polyisoprene is commercially produced and used alone or in combination with natural rubber. 1 and 4 – Polybutadiene with a high percentage of cis is soft, easily soluble. It has low waste and good abrasion resistance. On the other hand, 1 and 4-polybutadiene has a high percentage of trans, hard, crystalline and has low solubility. This polymer can be used to cover golf balls
Polymers and surfaces ethylene propylene
Ethylene and propylene copolymers (EPMs) made by soluble polymerization using a Ziegler catalyst are double bonds. Because of this, they have no volcanic power and are also resistant to oxygen and ozone. The reactivity of ethylene and propylene is very different, so the composition of the monoparticles is different from the composition of the cohesive product produced. EPR can be vulcanized by heating in the presence of peroxide. In this method, the chains are connected by the direct connection of carbon atoms, and this is contrary to the connection of chains through sulfur connections in common processes. These tires can be used for many applications without vulcanizing. For easier vulcanization, ethylene-propylene polymers are fabricated with a DNA (EPDM). EPDM polymers have a unique resistance to heat, oxygen and ozone and are heated as a substitute for hot asphalt roofing. Other uses include wire and cable insulation, which compete with neoprene.