Effect of different structured epoxy-type reactive rejuvenators on recycling performance and repair mechanism of the aged styrene-butadiene-styrene (SBS) modified bitumen

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-03-17 DOI:10.1016/j.polymdegradstab.2025.111331

Qingyuan Ma , Hongwei He , Wenwen Yu , Jianjun Xu , Quanxin Xu , Jiaqi Xue , Yushi Jin , Rong Zhu , Chen Han , Bo Wang , Chen Cui , Jie Ma , Fuyong Liu , Heng Zhang

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引用次数: 0

Abstract

The styrene-butadiene-styrene (SBS) modified bitumen (SMB) has gained worldwide popularity due to its exceptional performance. However, the waste SMB generated by its maintenance and resurfacing urgently needs to be rejuvenated with good performance for the prolonged service life of asphalt roads. In this study, the epoxy-type reactive rejuvenators, trimethylmethylpropane triglycidyl ether (TMPTE) and polyethylene glycol diglycidyl ether (PEGDGE), combined with vegetable oil (VO) were employed to reconstruct the aged SBS modified bitumen. Mild-moderate thermo-oxidative aging and pressure aging methods were applied, and regeneration experiments were conducted subsequently. FTIR indicates the occurrence of the SBS repair reaction or/and epoxy homo-polymerization. GPC demonstrates the restoration of characteristic peaks for both SBS and bitumen in aged SMB after the regeneration, while FM images show a reconstructed network structure of SBS. From a macroscopic perspective, the regeneration of aged SMB was assessed from four aspects, i.e. high/low temperature performance, elasticity and stiffness. It is found that the PEGDGE regenerated SMB exhibits the best high-temperature performance in the thermo-oxidative aging system, while the TMPTE regenerated SMB demonstrates the best high-temperature performance in the pressure aging system. And TMPTE regenerated SMB exhibits the best low temperature performance and elasticity in the thermo-oxidative aging system, and PEGDGE regenerated SMB exhibits the excellent low temperature performance and recovery performance in the pressure aging system. Meanwhile, in the thermo-oxidative aging system, PEGDGE regenerated SMB demonstrates superior deformation resistance. In the pressure-aging system, TMPTE regenerated SMB exhibits exceptional deformation resistance. The mechanism for the varying regeneration effects of different aging methods and regeneration systems were analyzed, suggesting a possible correlation with the molecular structures (e.g. functionality, chain flexibility) of the epoxy-type reactive rejuvenators. This study offers a theoretical guidance for regenerating aged SMB pavements with varying degrees of aging and a reference for selection or synthesis of reactive rejuvenators.

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.