偶联官能化SBS改性沥青的制备及其热储存稳定性评价

选用一种新型的偶联官能化SBS，成功制备热储存稳定性良好的改性沥青，考察了SB段相对分子质量和偶联率对改性沥青性能的影响。结果表明：官能化SBS上的极性基团易与基质沥青中的极性基团相互作用，形成更有效的网状结构，从而使官能化SBS与基质沥青具有良好的相容性，改善了沥青的热储存稳定性和热性能；当SB段相对分子质量控制在6.5?104左右、偶联率在75%以上时，改性沥青性能最佳。

PREPARATION OF MODIFIED ASPHALT WITH THERMAL STORAGE STABILITY BY COUPLING FUNCTIONALIZED SBS

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.