关键词: 聚合物, 苯乙烯-丁二烯-苯乙烯嵌段共聚物, 合成, 接枝, 石油, 改性沥青

Abstract: Styrene - butadiene - styrene block copolymer（SBS） has become the most widely used polymer asphalt modifier due to its excellent performance as a thermoplastic elastomer. Considering the significant difference in their physical and chemical properties between SBS and asphalt，the poor compatibility and segregation tendency in the preparation of modified asphalt，the grafted method for SBS were introduced，together with principles represented by the initiator and radiation grafting. The research status of grafted SBS，as an asphalt modifier，was reviewed. Finally，the research emphasis in the future was put forward，including selecting the monomer that has appropriate polarity and no impact on the performance of asphalt，strictly controlling the synthesis process of grafted SBS by comprehensively studying material dosage，temperature，time and other factors，fully and accurately characterizing the structure and grafting rate of grafted SBS，and researching its modified mechanism in-depth to obtain complete product characterization.

Key words: polymer, styrene - butadiene - styrene block copolymer（SBS）, synthesis, grafting, petroleum, modified asphalt