In the production of modified bitumen, different structures of SBS modifiers (linear and star-shaped) have a significant effect on the rheological properties and durability of bitumen.

First of all, regarding rheological properties, the linear and star-shaped structures of SBS modifiers perform differently in bitumen. Linear SBS modifiers are relatively easy to process and can be fully mixed with base bitumen at a lower temperature to form a uniform modified bitumen. SBS modifiers with this structure show good elasticity and ductility at room temperature, which can effectively improve the viscoelasticity and ductility of bitumen, thereby enhancing the impact resistance and cracking resistance of the pavement.

Relatively speaking, star-shaped SBS modifiers are more superior in rheological properties, can provide higher adhesion and toughness, and further improve the bonding between bitumen and aggregate. SBS modifiers with this structure can better maintain their fluidity at high temperatures and adapt to the use requirements in high temperature environments.

Secondly, the different structures of SBS modifiers also have an important influence on the durability of modified bitumen. Due to the characteristics of its molecular structure, the star-shaped SBS modifier can form a more stable network structure in bitumen, thereby significantly improving the strength and waterproof ability of bitumen mixture and enhancing its durability. This type of SBS modifier has better performance in anti-rutting performance and driving comfort, and can effectively reduce the maintenance cost of the road. Although the linear SBS modifier is more superior in processing performance, it may be slightly inferior in durability, especially under high temperature and high load conditions, and certain flow deformation may occur.

In summary, the linear and star-shaped structures of SBS modifiers have a significant impact on the rheological properties and durability in the production of modified bitumen. The selection of the appropriate SBS modifier structure should be based on the specific application requirements and production process to achieve the best modification effect and pavement performance.

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