Interfacial Bionic Design and Performance Evaluation of Polyacrylonitrile Fiber@SBS Modified Binder

Abstract

The mechanical properties of fiber composites are greatly affected by the interfacial interactions between the fibers and matrix, and hence the study of interfacial properties becomes critical. This study demonstrates a simple and effective interfacial modification process using polydopamine (PDA) coating with ZnO nanorods to construct a multi‐scale bionic structure on the polyacrylonitrile (PAN) fiber, which is conducive to increasing the bonding area and enhancing the load transfer, thus boosting the mechanical properties of the modified fiber‐incorporated asphalt binder. The cone penetration test and thermogravimetric analysis show that the octopus‐inspired multiscale PAN fiber (OIM‐PAN) composite styrene butadiene styrene modified binder (SBS/MB) has better shear strength and thermal stability. Dynamic shear rheometer test shows that the deformation resistance and viscoelastic properties of the fiber composite SBS/MB are enhanced compared with SBS/MB, and the OIM‐PAN composite SBS/MB (OIM‐PAN@SBS/MB) exhibits the best deformation resistance and viscoelastic properties. Thus, it can be concluded that this interfacial modification process can significantly improve the mechanical properties of fiber–asphalt composites by introducing a third phase between the fiber and asphalt interface to achieve functionally graded material properties and enhance the load transfer between the interfaces for large‐scale applications in road engineering and construction sites.

Designing electrostatic synergistic nanohybrid interface layer in polyester fiber for asphalt binder modification

“…FM can characterize the distribution of fibers and SBS in the asphalt binder 18 . Asphaltenes and aromatic hydrocarbons influence the diffusion of SBS in the asphalt binder 17 .…”

“…FM can characterize the distribution of fibers and SBS in the asphalt binder. 18 Asphaltenes and aromatic hydrocarbons influence the diffusion of SBS in the asphalt binder. 17 Figure 15a shows that SBS polymer in SBS@MA is unevenly agglomerated, showing a dense distribution.…”

“…15,16 Recently, the mussel-inspired bionic coating method has gained widespread attention, which can activate the pristine fiber by incorporating surface active sites. 17 Xing et al 18 used bionic polydopamine (PDA) coatings to graft ZnO nanorods to build multiscale hierarchical structures to better transfer stress loads and achieve enhanced mechanical properties. Su et al 12 used bionic PDA layers to covalently graft aminated graphene, which slowed down the stress concentration of the MA, resulting in better viscoelasticity.…”

Investigating the adhesion and rheological properties of metal organic framework incorporated polyester fiber/zeolite imidazolium salt framework‐67‐modified asphalt composite

“…In Figure 6F, the cone penetration and shear stress test results for each modified asphalt sample are presented to evaluate the shear rheological resistance of the modified asphalt. 55 It is observed that as the fiber content increases gradually from 0.5% to 1.5%, the cone penetration of the asphalt binder decreases, while shear strength increases. Furthermore, at the same fiber dose, the shear strength of the asphalt binder follows the order of ZIF-67-PDA-PET/SBS-MA > PET/SBS-MA > SBS-MA.…”

“…56 Notably, at ZIF-67-PDA-PET fibers doping level of 1.5%, a 3.6% increase in the softening point and a 26.23% enhancement in ductility compared to the original PET fiber-modified asphalt was observed, demonstrating improved high-temperature stability. 55 This improvement can be attributed to the ZIF-67-PDA interfacial layer, which provides the PET fibers with enhanced roughness and surface activity. Consequently, the fibers exhibit greater adsorption of light components, reinforcing the structural layer of fibers in contact with the asphalt, thereby enhancing stress transfer at the fiber-asphalt interface.…”