The reaction mechanism between polymer and bitumen mainly involves the following aspects:

1. Interaction mechanism: The interaction between polymer and bitumen is mainly achieved through physical and chemical reactions. Polymers can react with components in bitumen through cross-linking reactions (such as vulcanization reactions) to form a more complex network structure. This cross-linking reaction enhances the adhesion and high temperature resistance of bitumen. In addition, the functional groups of polymers can react chemically with specific components in bitumen to further improve its performance.

2. The effect of polymers on bitumen properties: The addition of polymers can significantly improve the softening point and high temperature stability of bitumen. For example, studies have shown that when SBS (styrene-butadiene-styrene) is used as a modifier, the softening point of bitumen will be significantly improved, and this increase is proportional to the dosage of the polymer.

3. The composition of the base bitumen: The modification effect of the polymer is also closely related to the composition of the base bitumen. bitumen from different sources has different contents of oil, resin and bitumenene, resulting in differences in the softening point and other properties of the modified bitumen.

In summary, polymers interact with bitumen through chemical reactions and physical cross-linking mechanisms, significantly improving the properties of bitumen, especially in terms of high temperature stability and softening point.

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