基于苯乙烯-丁二烯-苯乙烯嵌段共聚物结构差异的改性沥青老化过程热重分析  

Thermogravimetric analysis of modified asphalt based on structure difference of styrene-butadiene-styrene block copolymer during thermal oxidation aging

作　　者：韩明哲[1] 徐郑帅 曹兰[1] HAN Ming-zhe;XU Zheng-shuai;CAO Lan(School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《合成橡胶工业》2021年第5期398-398,共1页China Synthetic Rubber Industry

基　　金：Supported by Natural Science Foundation of Shandong Province (ZR 2020 QE 072);Qingdao Key R&D Program (21-1-2-8-c l)

摘　　要：制备了7种不同苯乙烯-丁二烯二嵌段(SB)含量、苯乙烯链段含量及数均分子量的苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性剂,用于制备改性沥青,并考察了SBS的结构对改性沥青性能的影响。结果表明,SBS改性沥青的热重曲线与基质沥青相似,其老化过程包括轻质组分向重质组分的转化和SBS自身的降解与交联,不同SBS结构的改性沥青的质量损失快慢和大小存在差异;SBS数均分子量大的改性沥青长期老化后稳定性较好;聚苯乙烯链段含量高的SBS改性沥青老化后的质量损失率明显降低,在短期老化后有较好的热稳定性;含SB较多的SBS改性沥青耐老化能力差,老化后的质量损失率显著增长。Asphalt material is widely used in high-grade pavement engineering,and its use quality has an important impact on its durability.Styrene-butadiene-styrene block copolymer(SBS)modifier can significantly improve the high temperature stability,low temperature cracking resistance and fatigue durability of asphalt,which has been widely used in asphalt pavement engineering.Due to the interaction of heat,light,oxygen and other environmental factors,SBS often ageing degrades,which leads to the degradation of the modified asphalt pavement performance,in which the thermal oxygen aging is the most important factor for the deterioration of the performance of SBS modified asphalt.

关 键 词：苯乙烯-丁二烯-苯乙烯嵌段共聚物 改性沥青 热氧老化 质量损失率 热重分析 

分 类 号：U414[交通运输工程—道路与铁道工程] TQ317[化学工程—高聚物工业]