The role of rejuvenator functional groups in restoring aged SBS modified asphalt: Effects of SBS molecular architecture and block ratio

IF 8.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2026-03-21 Epub Date: 2026-02-20 DOI:10.1016/j.conbuildmat.2026.145682

Chenghao Liang , Changjun Sun , Duo Liu , Qishi Li , Jinyang Lin , Xianhe Wu , Henglong Zhang

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引用次数: 0

Abstract

To elucidate the reaction mechanisms between functional groups of reactive rejuvenators and the molecular architecture of styrene-butadiene-styrene copolymer (SBS), this study systematically investigates the rejuvenation effects of a monofunctional rejuvenator, dodecenyl succinic anhydride (DDSA) and a bifunctional rejuvenator, 4,4′-diaminodiphenylmethane (MDA) on aged SBS modified asphalt (SBSMA) incorporating linear and star-shaped SBS with different block ratios. The macroscopic properties and microstructural evolution of the rejuvenated binders were evaluated. The results show that the molecular architecture and block ratio of SBS have a significant effect on the aging sensitivity and rejuvenation response of SBSMA. Both rejuvenators effectively mitigate aging-induced hardening and successfully reconstruct the characteristic phase angle plateau of SBSMA. DDSA primarily promotes the reconstruction of the SBS polymer network, enhances chain flexibility and showing superior performance in low-temperature rheological recovery. In contrast, owing to its bifunctional molecular structure, MDA more effectively reconstructs polymer network junctions in star-shaped SBS systems, thereby significantly enhancing high-temperature performance and fatigue resistance. Gel permeation chromatography and fluorescence microscopy analyses further confirm that MDA achieves a more substantial recovery of the SBS large molecular weight region and the three-dimensional polymer network in star-shaped systems compared with DDSA. The rejuvenation efficiency of reactive rejuvenators is governed not only by their functional group characteristics but also by the molecular architecture and block ratio of SBS. This study reveals the differentiated rejuvenation mechanisms of reactive rejuvenators from the perspective of molecular structure matching, providing a theoretical basis for the targeted rejuvenation of SBSMA and the molecular design of rejuvenators.

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活化官能团在SBS改性沥青老化修复中的作用：SBS分子结构和嵌段比的影响

为了阐明活性返老还老剂官能团与苯乙烯-丁二烯-苯乙烯共聚物（SBS）分子结构之间的反应机理，本研究系统地研究了单功能返老还老剂十二烷基丁二酸酐（DDSA）和双功能返老还老剂4,4′-二氨基二苯基甲烷（MDA）对含不同嵌段比线性和星形SBS的老化SBS改性沥青（SBSMA）的返老还老效果。对回火后粘结剂的宏观性能和微观结构演变进行了评价。结果表明，SBS的分子结构和阻滞率对SBSMA的老化敏感性和返老还老反应有显著影响。两种返老还老剂都能有效缓解时效硬化，并成功重建SBSMA的特征相角平台。DDSA主要促进SBS聚合物网络的重建，提高链的柔韧性，在低温流变恢复中表现出优异的性能。相比之下，由于其双功能分子结构，MDA更有效地重建星形SBS体系中的聚合物网络连接，从而显着提高了高温性能和抗疲劳性能。凝胶渗透色谱和荧光显微镜分析进一步证实，与DDSA相比，MDA在星形体系中实现了更大幅度的SBS大分子量区和三维聚合物网络的恢复。活性还原剂的还原性不仅受其官能团特性的影响，还受SBS的分子结构和嵌段比的影响。本研究从分子结构匹配的角度揭示了反应性返老还童的差异化返老还童机制，为SBSMA的靶向返老还童和返老还童的分子设计提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.