SBCs are copolymers formed by the polymerisation of styrene and butadiene monomers.
The copolymerisation of these monomers results in a unique structure that combines rigid styrene blocks with flexible butadiene blocks.
The styrene blocks provide rigidity, while the butadiene blocks impart elasticity and flexibility to the material.
Identification
SBCs are combustible materials and can burn with a yellow flame.
When extinguished, they may emit a characteristic odor depending on the specific formulation.
Useful data
Density: The density of SBCs varies depending on the specific formulation, typically ranging between 0.9 and 1.1 g/cm³.
Pre-Drying: Pre-drying is generally not required for SBCs unless they have been exposed to moisture. If needed, drying can be done at temperatures around 70-90 °C for several hours.
Melt Temperature: The recommended melt temperature for SBCs is typically in the range of 160-220 °C.
Mold Temperature: The mold temperature for SBCs is usually set between 20-70 °C, depending on the specific requirements and part geometry.
Shrinkage: SBCs typically exhibit low shrinkage.
History
SBCs have been commercially available since the mid-20th century. They were developed as a response to the need for materials that combine the flexibility of rubber with the processability of thermoplastics. Over the years, advancements in polymerisation techniques and formulation have expanded the range of SBCs and their applications, making them widely used in various industries.
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