SBS微观结构对SBS改性沥青性能影响研究
Effects of SBS Microstructure on the Properties of SBS Modified Asphalts
姚鸿儒 1王强 2王仕峰1
作者信息
- 1. 上海交通大学化学化工学院,上海 200240
- 2. 上海城建日沥特种沥青有限公司,上海 200436
- 折叠
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.
Abstract
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.
关键词
SBS改性沥青/体积排除色谱/两嵌段/乙烯基含量/性能Key words
SBS modified asphalts/size exclusion chromatography/diblock/vinyl content/property引用本文复制引用
基金项目
上海市2021年度"科技创新行动计划"启明星项目(21QB1401100)
出版年
2024
NETL
NSTL
万方数据