“BR” stands for Butadiene Rubber, which is a synthetic rubber polymer primarily composed of butadiene. Polybutadiene rubber, often referred to as BR, is a type of synthetic rubber made by the polymerization of butadiene monomers. It is known for its excellent elasticity and low-temperature performance.
Polybutadiene rubber can be categorized into two main types based on its cis content: high cis and low cis polybutadiene. These classifications refer to the configuration of the butadiene monomers in the polymer chain, with cis and trans isomers being the two primary possibilities. The cis isomer has the methyl groups on the same side of the double bond, while the trans isomer has them on opposite sides.
High cis polybutadiene (Cis-BR):
High cis BR exhibits exceptional rebound and elasticity, making it suitable for applications where these properties are critical, such as in tire manufacturing.
Good abrasion resistance:
Low heat buildup:
Low cis polybutadiene:
Reduced low-temperature flexibility:
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