Bromobutyl Rubber (BIIR)

• Structure: Bromobutyl rubber is structurally similar to butyl rubber (IIR), with the addition of bromine atoms introduced by the bromine-containing monomer. This bromination alters the properties of the rubber and provides unique characteristics.
• Impermeability: Like butyl rubber, BIIR exhibits excellent impermeability to gases and liquids, making it suitable for applications requiring containment or isolation from external elements.
• Heat Resistance:Bromobutyl rubber typically has improved heat resistance compared to standard butyl rubber. This property makes it suitable for applications where exposure to high temperatures is a concern.
• Low Gas Permeability:BIIR, similar to butyl rubber, has low gas permeability, which makes it suitable for applications requiring gas barrier properties, such as inner liners for tubeless tires.
• Chemical Resistance: Bromobutyl rubber shows good resistance to a wide range of chemicals, oils, and solvents. This makes it suitable for applications in industries where exposure to such substances is common.
• Vulcanization:Bromobutyl rubber can be vulcanized to improve its mechanical properties, such as tensile strength, elongation, and tear resistance. Vulcanization involves the cross-linking of polymer chains using sulfur or other vulcanizing agents.
• Applications:Bromobutyl rubber finds applications in various industries, including automotive, pharmaceuticals, construction, and industrial manufacturing. Some common applications include tire inner liners, pharmaceutical stoppers, seals, gaskets, hoses, and roofing membranes.
• Manufacturing Processes:Bromobutyl rubber is typically produced through the copolymerization of isobutylene with bromine-containing monomers using solution or suspension polymerization techniques. The resulting polymer can be further processed and compounded to meet specific application requirements.

In summary, bromobutyl rubber (BIIR) offers a balance of impermeability, heat resistance, chemical resistance, and mechanical properties, making it suitable for a wide range of applications where these properties are essential. It is often chosen for applications where standard butyl rubber may not provide adequate heat resistance or chemical resistance.