Compatibilizers and stabilizers have important effects on the dispersion state and stability of SBS in bitumen.

First, compatibilizers can soften and swell SBS, reducing the force of SBS molecules, so that it is more evenly dispersed in the bitumen. The addition of compatibilizers can increase the surface area of SBS and provide more chemical reaction sites, which is conducive to the chemical reaction and cross-linking reaction between SBS and bitumen. This can form a stable spatial network structure, wrap the bitumen in the network, and prevent the phase separation of SBS and bitumen.

Secondly, the stabilizer can trigger the crosslinking reaction of SBS and promote the formation of a stable spatial network structure of dispersed SBS. The addition of stabilizer can trigger the reaction between SBS and bitumen, and produce SBS bitumen graft, which is located between SBS phase and bitumen phase, reduces the surface tension between SBS and bitumen and the Gibbs free energy of the system, and inhibits the phase separation of SBS and bitumen. Increasing the amount of stabilizer can increase the number of crosslinking points and crosslinking density, and make the network structure more developed and the network strength greater, so as to improve the stability of the modified bitumen.

Compatibilizers and stabilizers have certain complementarity, and the amount of stabilizer can be reduced by appropriately increasing the amount of compatibilizers, or by appropriately increasing the amount of stabilizer to reduce the amount of compatibilizers. On the premise of ensuring stability, the dispersion state and stability of SBS in bitumen can be optimized by adjusting the dosage of compatibilizers and stabilizers.

In short, the role of compatibilizers and stabilizers is to promote the uniform dispersion and stability of SBS in the bitumen.

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