Abstract: A new type of coupling functionalized SBS was used to prepare modified asphalt with thermal storage stability. The effect of the molecular weight of SB block and the coupling efficiency on the properties of modified asphalt was investigated. The results showed that the polar groups of the functionalized SBS were easy to interact with the polar groups of the base asphalt to form a network structure, leading a good solubility between the functionalized SBS and matrix asphalt; the thermal storage stability and thermal performance of the modified asphalt were improved. The performance of modified asphalt was the best when the coupling efficiency was above 75% and the molecular weight of SB segment was 6.5×104.

Key words: coupling reaction, functionalized SBS, thermal storage stability, modified asphalt