The microstructure of SBS affects the properties of SBS modified asphalts.lhe livingness of anionic polymerization can achieve precise control over the microstructure.The structure parameters of SBS in-clude architecture,molecular weight,styrene content,diblock content,vinyl content and functionalization.The molecular weight and its distribution,diblock content,styrene content,and vinyl content can be meas-ured by size exclusion chromatography and nuclear magnetic resonance.SBS with radial architecture or higher molecular weight has better modification effects,but worse compatibility with asphalts.The hot-storage sta-bility and cracking resistance of asphalts modified by SBS with lower styrene content are better,while the workability and high-temperature properties of those with higher styrene content are better.Diblock can im-prove processability and cracking resistance,but damage high-temperature performance.Higher vinyl con-tent can improve compatibility,aging resistance and high-temperature performance,but is detrimental to low-temperature performance.Functionalization can improve the compatibility between SBS and asphalts.SBS modifiers with appropriate microstructures should be selected for specific service conditions.
SBS modified asphaltssize exclusion chromatographydiblockvinyl contentproperty
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