Preparation of hyperbranch‐structured polyester fiber via thiol‐ene click reaction under UV light irradiation for asphalt binder modification

Abstract

This study reports the application of UV induced "thiol-ene click reaction" by coupling the covalent bonds of venyl-terminated dendritic polyester (VTDP) and polyester (PET) fiber and resulting in the fabrication of hyperbranchstructured PET named as VTDP-PET fiber. The PET fiber or VTDP-PET fiber as additives were blended with styrene-butadiene-styrene modified asphalt (SBSMA) to prepare fiber/SBSMAs. Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectrometry, and X-ray photoelectron spectroscopy characterizations indicated that VTDP-PET fiber was linked with spherical three-dimensional dendritic molecular structure. Cone penetration, dynamic shear rheometer, multistress creep recovery, and thermogravimetric analysis tests showed that VTDP-PET/SBSMA exhibited enhanced resistance to flow, viscoelasticity, resistance against rutting, and thermal stability as compared to those of PET/SBSMA. The newly designed PET fiber and VTDP-PET fiber can be envisioned as effective alternative candidate for the fabricated of modified SBSMA with enhanced performances for practical applications in construction and highway industries.

Synthesis of tannic acid‐terephthalyl chloride modified rubber powder for the fabrication of tannic acid‐terephthalyl chloride‐rubber/styrene‐butadiene‐styrene modified asphalt

“…RP absorbs the light components of asphalt, swells and cracks, and the sulfide contained in the powder gradually moves to the upper part of the asphalt, thus causing the crosslinking of asphalt and improving the softening point 34 . The difference between the softening points of the upper and lower parts of SBSMA and RP/SBSMA is very large, indicating that serious phase segregation occurred, which may be due to the low compatibility of SBS and RP with asphalt 36,45 . The difference between the upper and lower softening points of TA‐TPC‐Rubber/SBSMA is markedly reduced, indicating that its phase segregation phenomenon is significantly reduced.…”

“…Recovery rate (R) and average creep compliance (J nr ) represent the rutting resistance of modified asphalt 36 where larger R and smaller J nr indicate better rutting resistance performance of asphalt 37,38 . Table 2 shows R and J nr of modified asphalt at 0.1 and 3.2 kPa, which suggests that R 0.1 > R 3.2 and J nr0.1 < J nr3.2 .…”

Electrospinning strategy for the preparation of nano‐porous fibers as modifier for inducing the network structure and enhancing mechanical properties of SBS‐modified asphalt

“…[7] Meng et al prepared a hyperbranched structure fiber (VTDP-PET) by covalently grafting venyl-terminated dendritic polyester to polyester fiber, and the VTDP-PET/ styrene-butadiene-styrene (SBS) modified asphalt exhibited enhanced resistance against rutting and viscoelasticity. [8] Although engineers are interested in the properties of materials at the macro and mesoscale, phenomena on the nano and micro scales provide basic insights into the potential interactions that define physical and chemical behavior of materials. [9] In addition, macro-fibers as asphalt binders suffer from problems such as limited crosslinking sites, high cost, vulnerability to agglomeration and interfacial instability.…”

“…[ 7 ] Meng et al prepared a hyperbranched structure fiber (VTDP‐PET) by covalently grafting venyl‐terminated dendritic polyester to polyester fiber, and the VTDP‐PET/styrene‐butadiene‐styrene (SBS) modified asphalt exhibited enhanced resistance against rutting and viscoelasticity. [ 8 ]…”

Study on the modified fiber with nacre layer structure based on bionic coating and molybdenum disulfide co‐construction incorporated asphalt

“…In order to solve the problem of weak interfacial interaction between the fiber and base asphalt due to structural differences, chemical grafting, and surface modification of fiber are often applied as an effective tool. For example, Meng et al [10] prepared super-grafted structural fiber by covalent grafting venyl-terminated dendritic polyester on polyester fiber, which upon incorporation to styrene-butadiene-styrene (SBS)-modified asphalt enhanced the rutting resistance, viscoelasticity, and thermal stability. Xiang et al [11] modified the surface of basalt fiber by silane-coupling agent (KH550), which turned the surface of the fiber rougher and enhanced its chemical bonding with asphalt, thus improving the mechanical properties of the fiber-incorporated SBS asphalt.…”