Investigating the adhesion and rheological properties of metal organic framework incorporated polyester fiber/zeolite imidazolium salt framework-67-modified asphalt composite
Utilizing efficient and cost-effective modifiers is essential for the development of high-performance asphalt materials. In this study, a polydopamine (PDA) chelated cobalt ion (Co2+)-assisted in situ growth strategy was employed to anchor nanoporous zeolite imidazolium salt framework-67 (ZIF-67) on polyester (PET) fiber substrates for the preparation of styrene-butadiene-styrene block copolymer-modified asphalt (SBS-MA). Experimental results indicated that optimal fiber incorporation of 1.5% led to the best interfacial interaction at the modified asphalt fracture section. ZIF-67 nanoporous structure acted as an organic–inorganic hybridization interfacial layer to enhance the fiber–asphalt interfacial interaction. The adhesion work of the modified fiber with SBS-MA increased by 42.12%. Furthermore, the adhesion work, peeling work, and compatibility ratio of modified asphalt with aggregates were also improved. Similarly, the complex modulus of the 1.5% ZIF-67–PDA–PET/SBS-MA at 46°C was increased by 131.30% in comparison with that of the pristine SBS-MA. More importantly, the synergistic effect of the highly thermally stable PET fibers and ZIF-67 nanocrystals improved the thermal decomposition of SBS-MA. These results suggest that ZIF-67–PDA–PET fiber holds great promise for application in designing novel materials for the construction industry.
