This study investigates the rheological properties and aging resistance of a dynamic disulfide crosslinked styrene-butadiene-styrene (SBS) vitrimer-modified asphalt. Traditional SBS-modified asphalt is susceptible to degradation from oxidative chain scission. To address this, an SBS vitrimer was synthesized by introducing dynamic disulfide bonds via esterification between epoxy-functionalized SBS and a disulfide-based crosslinker. Fourier transform infrared (FTIR) spectroscopy confirmed the formation of this dynamic covalent network. Rheological tests demonstrated that the SBS vitrimer-modified binder (SVmB) exhibited superior performance stability after both Rolling Thin Film Oven (RTFO) and Pressure Aging Vessel (PAV) aging compared to traditional SBS-modified binder (SBSmB). Gel permeation chromatography (GPC) analysis revealed that SVmB maintained molecular weight stability during aging, in contrast to the obvious reduction observed for SBSmB. This stability is attributed to the reorganization capability of the dynamic disulfide network, which compensates for chain breaks. Furthermore, SVmB showed enhanced fatigue resistance under aging conditions. In conclusion, the dynamic disulfide crosslinking in SBS vitrimer-modified asphalt provides exceptional aging resistance and maintains rheological properties by enabling network reconfiguration, offering a promising strategy for developing more durable and cleaner pavement materials.
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Hu et al. (2026) studied this question.
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