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

摘要： 苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）作为一种性能优异的热塑性弹性体，已成为目前应用最广泛的聚合物沥青改性剂。本文针对SBS与沥青物化性质差异较大、相容性不足、制备的改性沥青易离析的应用缺陷，在阐释接枝SBS接枝原理的基础上，总结了以引发剂法和辐射接枝聚合法为代表的接枝方法，综述了不同单体接枝SBS作为沥青改性剂的研究现状，通过分析评价提出了今后的研究重点，即选择极性合适、不影响沥青性能的单体，综合研究物料用量、温度、时间等因素来严格控制接枝SBS合成过程，全面准确地表征接枝物结构及接枝率等参数，并深入研究其改性沥青机理，建立整套指标体系。

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