It is characterized by good dielectric properties, compatible with silicone oils, water and solutions diluted with acids, bases and salts.
It shows poor resistance to oxygen, ozone, UV radiation and oxidizing agents, unless in the form of a specially formulated compound. It is incompatible with mineral, vegetable and animal oils as well as aliphatic, aromatic and chlorinated hydrocarbons.
The operating temperatures are between -45 and +100°C. It shows low resistance to heat and zero resistance to flame, while demonstrating good resistance to the cold, even if the glass transition temperature is -60°C.
SBR is produced by polymerizing the base monomers in an emulsion. Two processes are used for industrial synthesis:
In both cases, the butadiene copolymerizes with styrene especially in 1,4 (cis and trans), but also in 1,2.
Polybutadiene is a synthetic rubber which has high wear resistance. Its elasticity ensures a post-stress recovery of 80%. Chemically, polybutadiene is a polymer consisting of monomeric units of cis-1,4-butadiene. The polymerization mechanism depends on the reaction conditions, specially on the catalysts used. The formation of bridges due to the presence of double bonds, contributes to the elasticity of the polymer. Polybutadiene undergoes vulcanization to further improve its chemical, physical and mechanical quality, in relation to the intended use.
Depending on the percentages of specific isomeric subunits present, the following categories of polybutadiene can be obtained:
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