摘要
SBS的微观结构影响SBS改性沥青的性能。阴离子活性聚合的特点可以实现对分子微观结构的精准控制。SBS的结构参数包括结构类型、分子量、苯乙烯含量、两嵌段含量、乙烯基含量和功能化改性。采用体积排除色谱和核磁共振可测得SBS的分子量和分子量分布、两嵌段含量、苯乙烯含量以及乙烯基含量。星型SBS及分子量大的SBS改性效果好,但与沥青相容性差。苯乙烯含量低的SBS制备的改性沥青热储存稳定性和低温抗裂性好;苯乙烯含量高的SBS制备的改性沥青施工和易性和高温稳定性好。两嵌段可以改善加工性能和低温抗裂性,但会损害高温性能。乙烯基含量高可以改善相容性、耐老化性和高温性能,但对低温性能不利。功能化改性可以提高SBS与沥青之间的相容性。应针对具体的应用场景选择合适结构的SBS改性剂。
The microstructure of SBS affects the properties of SBS modified asphalts.The livingness of anionic polymerization can achieve precise control over the microstructure.The structure parameters of SBS include 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 measured 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 stability 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 improve processability and cracking resistance,but damage high-temperature performance.Higher vinyl content 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.
作者
姚鸿儒
王强
王仕峰
YAO Hongru;WANG Qiang;WANG Shifeng(School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240;Shanghai Urban Construction NichiReki Special Asphalt Co.,Ltd.,Shanghai 200436)
出处
《石油沥青》
2024年第1期66-72,共7页
Petroleum Asphalt
基金
上海市2021年度“科技创新行动计划”启明星项目(21QB1401100)。
