▎ 摘　　要

Graphene nanoparticles (GNPs) added styrene-butadiene-styrene (SBS)-modified asphalt suffers from serious compatibility and agglomeration problems. To tackle these problems, in this study, graphene oxide (GO) was mixed with bromobutane to synthesize butylated graphene oxide (C4H9-GO) composite, which was in turn compounded with SBS for the preparation of C4H9-GO/SBS-modified asphalt. C4H9-GO/SBS-1.0-modified asphalt exhibited the best performance in terms of 11.4% increased softening point, 19.3% increased ductility, and 10.2% reduction in penetration as compared to 5% SBS-modified asphalt. Dynamic shear rheometer and multistress creep recovery tests showed that at 1.0% C4H9-GO contents, C4H9-GO/SBS composite-modified asphalt exhibited the best high-temperature performance and low stress sensitivity. Microscopic characterization of C4H9-GO via Fourier transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy revealed successful bonding between-C4H9 and GO, increasing interlayer spacing in GO. Atomic force microscopy and scanning electron microscopy analysis showed the superior elasticity of C4H9-GO than GNPs. Differential scanning calorimetry analysis indicated that C4H9-GO sheets can be stabilized by SBS through pi-pi stacking with the polystyrene chains. This study awarded to the preparation of novel C4H9-GO/SBS-modified asphalt with superior mechanical property can be deemed of potential value and applications in construction and highway industries. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48231.