Modification of asphalt using polyurethanes synthesized with different isocyanates

Líu, Hao; Zhang, Zengping; Zhu, Youxin; Sun, Jia; Wang, Li; Huang, Ting; Chen, Liqi

doi:10.1016/j.conbuildmat.2022.126959

Cited by 40 publications

(10 citation statements)

References 36 publications

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“…This helps to improve the ability of the asphalt binder to withstand traffic loading. Because a large number of flexible structures in HDE are added to SBSPAV, which reduces the high-temperature rutting resistance of the asphalt, the TLG of the rejuvenated asphalt prepared by HDE combined with ESO gradually decreases …”

Section: Resultsmentioning

confidence: 99%

Development on the Rheological Properties and Micromorphology of Active Reagent-Rejuvenated SBS-Modified Asphalt

Shi

et al. 2022

ACS Sustainable Chem. Eng.

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This study aimed to improve the recycling efficiency of waste styrene−butadiene−styrene (SBS)-modified asphalt pavements and achieve sustainable road resource development. The SBS-modified asphalt aged in a pressure aging vessel (SBSPAV) was rejuvenated utilizing active reagents [i.e., methylene-bis(4-cyclohexylisocyanate) (HMDI) and 1,6-hexanediol diglycidyl ether (HDE)] and epoxy soybean oil (ESO). The HMDI type (HMDI combined with ESO) and HDE type (HDE combined with ESO) were used as rejuvenators. The rheological behavior of rejuvenated asphalt binders at medium and high temperatures was evaluated utilizing multiple stress creep recovery tests, linear amplitude sweep tests, and rotational viscosity tests. The high-temperature rutting resistance, medium-temperature fatigue resistance, and fluidity of the rejuvenated asphalt were evaluated. The micromorphology, roughness, and adhesion of the rejuvenated asphalt were evaluated by atomic force microscopy. The thermal stability of the rejuvenated asphalt was analyzed by thermogravimetric analysis. The results reveal that the HMDI-rejuvenated asphalt combines with the active hydrogen in SBSPAV to generate a stable chemical structure that benefits the rutting resistance and traffic load grade of the rejuvenated asphalt. Due to the increase in stiffness, the fatigue resistance of the HMDI-rejuvenated asphalt could be damaged to some extent. The residual epoxy functional groups in the HDE-rejuvenated asphalt are dispersed in the asphalt in an independent phase state, which reduces the elastic recovery ability. The stiffness of the rejuvenated asphalt is lowered because it has a more flexible structure. The anti-fatigue effectiveness of the HDE-rejuvenated asphalt is improved. HMDI can boost the intermolecular force of the rejuvenated asphalt while decreasing its temperature sensitivity. The viscosity of the rejuvenated asphalt gradually decreases as the HDE content increases. This occurs because HDE combines with SBSPAV to generate flexible segments, thereby increasing the flexibility of the asphalt colloids. HMDI and SBSPAV undergo a chemical reaction, which partially repairs the structure of SBS and inhibits the free diffusion of the asphalt molecules. The number of the HMDI-rejuvenated asphalt bee-like structures increases, while the volume drops and adhesion increases. The number and volume of the bee-like structures decreased and adhesion increased as the HDE content increased. This occurs because HDE contains a high concentration of light components, which minimizes the amount of asphaltene in SBSPAV. Thermogravimetric analysis tests show that the HDE-rejuvenated asphalt and HMDI-rejuvenated asphalt have good thermal stability.

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Section: Resultsmentioning

confidence: 99%

Development on the Rheological Properties and Micromorphology of Active Reagent-Rejuvenated SBS-Modified Asphalt

Shi

et al. 2022

ACS Sustainable Chem. Eng.

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“…Polyurethanes (PUs) are versatile polymers comprising diisocyanates and polyol components and are known for their extinsive applications due to their flexibility, durability, and resilience ( Liu H. et al, 2022 ; Peyrton and Avérous, 2021 ). PUs can exist in various forms, like flexible foams, rigid insulation, coatings, adhesives, and sealants.…”

Section: Introductionmentioning

confidence: 99%

The state-of-art polyurethane nanoparticles for drug delivery applications

Song,

Muhammad,

Dang

et al. 2024

Front. Chem.

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Nowadays, polyurethanes (PUs) stand out as a promising option for drug delivery owing to their versatile properties. PUs have garnered significant attention in the biomedical sector and are extensively employed in diverse forms, including bulk devices, coatings, particles, and micelles. PUs are crucial in delivering various therapeutic agents such as antibiotics, anti-cancer medications, dermal treatments, and intravaginal rings. Effective drug release management is essential to ensure the intended therapeutic impact of PUs. Commercially available PU-based drug delivery products exemplify the adaptability of PUs in drug delivery, enabling researchers to tailor the polymer properties for specific drug release patterns. This review primarily focuses on the preparation of PU nanoparticles and their physiochemical properties for drug delivery applications, emphasizing how the formation of PUs affects the efficiency of drug delivery systems. Additionally, cutting-edge applications in drug delivery using PU nanoparticle systems, micelles, targeted, activatable, and fluorescence imaging-guided drug delivery applications are explored. Finally, the role of artificial intelligence and machine learning in drug design and delivery is discussed. The review concludes by addressing the challenges and providing perspectives on the future of PUs in drug delivery, aiming to inspire the design of more innovative solutions in this field.

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“…Currently, an increasing awareness of road safety issues and high pavement performance requirements (e.g., asphalt performance, material composition, grade composition, pavement structure design requirements, self-healing asphalt [2,3]) have crucially impacted the utilization of pavement performance specifications, and asphalt performance is directly related to the utilization of asphalt pavement performance specifications. Therefore, to enhance pavement performance, the asphalt performance should be improved [4]. Polymers can effectively enhance the properties of asphalt [4][5][6]; polyurethane-modified asphalt is an effective contemporary modification that can enhance the overall performance of asphalt [7,8], and its modification mechanism differs from that of rubber-modified asphalt.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, to enhance pavement performance, the asphalt performance should be improved [4]. Polymers can effectively enhance the properties of asphalt [4][5][6]; polyurethane-modified asphalt is an effective contemporary modification that can enhance the overall performance of asphalt [7,8], and its modification mechanism differs from that of rubber-modified asphalt.…”

Section: Introductionmentioning

confidence: 99%

The Performance and Distribution of Polyurethane-Modified Asphalt That Exhibits Different Molecular Weights

et al. 2023

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To analyze the effect of polyol on polyurethane (PU)-modified asphalt, three different soft segments of polyurethane were synthesized, and we utilized the reaction of MDI (diphenylmethane diisocyanate) with PU650, PU1000, and PU1400. With respect to molecular weight, the effect of polyol on the performance of modified asphalt was analyzed, and the asphalt was modified by using three different polyurethanes. To analyze the PU samples, the Fourier transform infrared spectroscopy (FTIR) tests and gel permeation chromatography (GPC) tests were selected; by contrast, to analyze the rheological properties and modification mechanism of asphalt, the dynamic rheology test (DSR), low-temperature bending creep test (BBR), multi-stress repetitive creep test (MSCR), FTIR, and differential scanning calorimetry (DSC) were selected. The results indicate that the molecular weight of polyol affects the molecular structure of polyurethane, the distribution of soft and hard segments, the content of soft segments, and the distribution of asphaltene in asphalt; thus, the asphalt modification effect occurs differently. The storage stability and high-temperature stability of the polyurethane-modified asphalts that were synthesized using three different polyols (i.e., polyols that exhibit different molecular weights) did not differ considerably, and the PU1400-modified asphalt exhibited the best low-temperature performance.

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Modification of asphalt using polyurethanes synthesized with different isocyanates

Cited by 40 publications

References 36 publications

Development on the Rheological Properties and Micromorphology of Active Reagent-Rejuvenated SBS-Modified Asphalt

Development on the Rheological Properties and Micromorphology of Active Reagent-Rejuvenated SBS-Modified Asphalt

The state-of-art polyurethane nanoparticles for drug delivery applications

The Performance and Distribution of Polyurethane-Modified Asphalt That Exhibits Different Molecular Weights

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