Modifier Concentration Research Articles

Cyan luminescence from Bi ions-doped borosilicate glass induced by the gradual substitution of MO (M=Ca, Sr, Ba)

At present, amorphous glasses that can give blue light, green light, and yellow light emission upon ultraviolet excitation have achieved good commercial prospect, but lacking of the high-efficiency cyan luminescence is still a challenging problem. To fill the lack of cyan light emission in the current white light LED technology spectrum excited by ultraviolet light, the effect of the substitution of CaO for SrO and BaO, and that of SrO for BaO on the optical properties, structure, DSC, and CIE (Commission International de L'Eclairage) coordinates of Bi ions-doped borosilicate glasses were systematically studied in this work. The emission spectra results reveal that the emission position of Bi ions-doped borosilicated glasses is observed from 482 nm to 492 nm when CaO is gradually replaced by SrO, from 482 nm to 502 nm when CaO is gradually replaced by BaO. In one word, the luminescent peak position of the Bi ions-doped borosilicate glass can be easily tuned by altering the concentration of basicity-earth oxide modifier, and the cyan light emission can be finally achieved.

Characteristics of Polyurethane/Waste Rubber Powder Composite Modifier and Its Effect on the Performance of Asphalt Mixture

To solve the problems of storage stability and the volatile organic compound emission of waste-rubber-powder-modified bitumen, the strategy of preparing composite modifiers using waterborne polyurethane coating for waste rubber powder was proposed in an early-stage work. However, the effect of polyurethane/waste rubber powder composite modifier on the performance of asphalt mixture is unclear, which limits the further popularization of this technology. Therefore, this work mainly investigates the characteristics of composite modifiers and their influence on asphalt mixture. The results indicate that the optimum ratio of polyurethane to waste rubber powder is about 1:1, which can give the composite modifier sufficient mechanical properties and acceptable economic benefits. The scanning electron microscopy images also confirm that polyurethane can densely encapsulate waste rubber powder. The physical properties experiment of bitumen shows that composite modifiers can increase the softening point and viscosity of bitumen but reduce the ductility and penetration of bitumen. Moreover, it was also found that composite modifiers can significantly improve asphalt mixtures’ resistance to permanent deformation and moisture damage. This can be attributed to the increase in the consistency of the asphalt binder due to the composite modifier. However, the anti-cracking properties of asphalt mixtures will be destroyed if the content of the composite modifier is too high. Therefore, it is necessary to balance the high and low temperature properties of asphalt mixtures when determining the dosage of composite modifiers in practical engineering. The results of this paper can provide a reference for the green application of waste-rubber-powder-modified bitumen.

Development of Blended Biopolymer-Based Photocatalytic Hydrogel Beads for Adsorption and Photodegradation of Dyes.

Blended biopolymer-based photocatalytic hydrogel beads were synthesized by dissolving the biopolymers in 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]), adding TiO2, and reconstituting the beads with ethanol. The incorporation of modifying biopolymer significantly enhanced the adsorption capacity of the cellulose/TiO2 beads. Cellulose/carrageenan/TiO2 beads exhibited a 7.0-fold increase in adsorption capacity for methylene blue (MB). In contrast, cellulose/chitosan/TiO2 beads showed a 4.8-fold increase in adsorption capacity for methyl orange (MO) compared with cellulose/TiO2 beads. In addition, cellulose/TiO2 microbeads were prepared through the sol-gel transition of the [Emim][Ac]-in-oil emulsion to enhance photodegradation activity. These microbeads displayed a 4.6-fold higher adsorption capacity and 2.8-fold higher photodegradation activity for MB than the millimeter-sized beads. Furthermore, they exhibited superior dye removal efficiencies for various dyes such as Congo red, MO, MB, crystal violet, and rhodamine B, surpassing the performance of larger beads. To expand the industrial applicability of the microbeads, biopolymer/TiO2 magnetic microbeads were developed by incorporating Fe2O3. These magnetic microbeads outperformed millimeter-sized beads regarding the efficiency and time required for MB removal from aqueous solutions. Furthermore, the physicochemical properties of magnetic microbeads can be easily controlled by adjusting the type of biopolymer modifier, the TiO2 and magnetic particle content, and the ratio of each component based on the target molecule. Therefore, biopolymer-based photocatalytic magnetic microbeads have great potential not only in environmental fields but also in biomedical fields.

Effect of Organic Additives on the Intensity of Metal Lines in the Emission Spectrum of a Drop-Spark Discharge upon Sample Introduction into an Electrolyte Anode

The effect of the nature and concentration of organic medium modifiers on the intensity of lines of some heavy metals (Ag, Cd, Hg, Pb, Tl, Zn) in the spectrum of a drop-spark discharge upon sample introduction into an electrolyte anode is studied. It is shown that additives of 0.1–6 wt % of polar organic compounds greatly increase the intensity of Pb, Tl, and Zn lines and reduce the intensity of Ag lines. The greatest effect, a twenty-fold enhancement of zinc lines, is observed upon the introduction of methanol into dilute acids. The cadmium signal is insensitive to organic impurities in dilute acids, but is enhanced in concentrated salt solutions.

Supercritical Fluid Extraction (SFE) of Polar Compounds from Camellia sinensis Leaves: Use of Ethanol/Water as a Green Polarity Modifier.

The use of bioactive plant extracts in cosmetic products is a common practice. Most of these extracts are obtained by maceration in organic solvents, and depending on which solvents are used, the polarity and the structure of the target molecules will vary. Polyphenols are polar compounds that often display antioxidant and/or antibacterial activities. To extract them, ethanol/water mixtures are usually selected as green solvents. This solid-liquid extraction (assisted or not) requires the use of high volumes of solvents and many additional steps like mixing, agitation, filtration, and evaporation. Alternatively, supercritical carbon dioxide (SC-CO2) offers many benefits for plant extraction: economical, non-toxic, and naturally concentrated extracts. However, its low polarity is not suitable to solubilize polar compounds. In this study, an experimental design was used to optimize supercritical fluid extraction (SFE) of caffeine and catechins from Camellia sinensis. Catechins are recognized for skin care use (antioxidant) and caffeine is also used for its skin care properties and to prevent excess storage of fat in cells. The temperature, modifier content, and water additive percentage were used as independent variables. The results showed that while the temperature was an insignificant parameter, a higher percentage of water (up to 20% in ethanol) and modifier favored the extraction of the polar target molecules. Additionally, the SFE results were compared with ultrasound-assisted extraction (UAE). Finally, a sequential selective extraction of caffeine from catechins is also presented.

Engineered pinhole-stitching process of PEI-based hollow fiber membrane enables preferred performance toward light gas separation

The hollow fiber configuration, comparing to flat-sheet and tubular modules, have gained much attention in a gas separation field due to its exceptionally high packing density. However, the decline in inherent selectivity exhibited by specific shape (namely hollow fiber) would result from the existence of pin-hole in its skin layer of hollow fiber. Hence, the post-treatment for the modification of pin-hole is crucial for this eye-catching configuration. Herein, the effects of bare fiber pore structure and corresponding post-treatment parameters including the concentration of modifier and modification method on the morphologies and permeation properties of the resultant membranes were investigated. The enhanced performance of polymeric hollow fiber after dip-coating in 6 wt. % polydimethylsiloxane (PDMS) solution was observed, which was due to modification of pin-hole. Subsequently, while the method of post-treatment was changed from dip-coating to internal coating, the hydrogen permeance had been increased by 3–4 times, benefiting from the less PDMS intrusion into the fiber pores. Meanwhile, its excellent separation factor toward H2/CH4 pair up to 65 also was showcased, confirming the presence of selective inner surface. In conclusion, this work provides a facile post-treatment to advance the gas transport capability of polymeric hollow fiber as well as maintaining the inherent permeance as maximum.

A novel gel permeation chromatography-based assessment methodology for aging condition of SBS modified asphalt in recycled asphalt pavement

As fossil energy sources gradually become depleted, the reclamation of recycled asphalt pavement (RAP) has received increasing attention. During the production process of recycled mixtures, the aging conditions of binders in RAP need to be measured prior to the mixing design process. The conventional method adopts chemical solvents, including trichloroethylene and toluene to extract and recovery binders in the RAP. And then measure the corresponding properties of RAP binders. However, the whole process is complicated and time-consuming, and the used chemical solvents are highly toxic and harmful to researcher’s health. Some scholars have proposed some methods to test the aging condition of asphalt binders in the RAP directly without extraction and recovery using the novel observation instruments. However, these methods are not suitable for modified asphalt. At present, modified asphalt has been often used in the road construction,especially for SBS modified asphalt. As such, the present study aims to introduce a novel approach to test the aging conditions of SBS modified binders in the mixtures avoiding the extraction and recovery process based on gel permeation chromatography (GPC). For this purpose, the molecular weight distribution as well as the physical properties of modified asphalt and binders in the mixtures at various aging degrees were first analyzed using GPC test. The polymer and asphaltene content of asphalt binders derived from GPC test were found correlation well with the aging degrees and properties of asphalt binders. Following this, several estimation models correlating the polymer and asphaltene content with penetration, viscosity and rutting factor were established. The robustness of established models were verified using laboratory-aged asphalt mixtures with three different SBS modifier contents and two kinds of on-site RAPs. The verification results showed that the properties in the mixture were reasonably estimated.

Properties of modified bitumen in road construction

The increase in the construction of asphalt concrete roads in Kazakhstan has led to the development of research on raw materials in this industry. Bitumen binder as the main component affecting the deformation properties, as well as the physical and mechanical properties of coatings, in general, is of the greatest interest to builders. The analysis of scientific sources in the field of the application of various modifiers of bitumen binders is carried out. Polymer-based additives have been widely used in road construction. The use of half-dimensional additives contributes to the improvement of asphalt concrete indicators: strength properties, water resistance, deformative stability of the coating at high and low operating temperatures, wear resistance, and resistance to rutting, which generally increases the repair time and contributes to a corresponding reduction in operating costs. This article presents a study of the properties of bitumen modified with an additive based on rubber crumbs. Indicators such as penetration depth and softening temperature by the ring and ball method are investigated in the article. The samples with different content of additives were taken: control sample without additives, and samples with the addition of modifiers in the amount of 5%, 10%, 12%, and 15% out of bitumen weight. The highest viscosity is shown by the sample with a modifier of 12%. Bitumen samples with a modifier content of 12% and 15% correspond to the standard indicators regarding softening temperature.

Mobile phase and column chemistry selection for high sensitivity non-targeted LC/ESI/HRMS screening of water

Systematic selection of mobile phase and column chemistry type can be critical for achieving optimal chromatographic separation, high sensitivity, and low detection limits in liquid chromatography electrospray high resolution mass spectrometry (LC/MS). However, the selection process is challenging for non-targeted screening where the compounds of interest are not preselected nor available for method optimization. To provide general guidance, twenty different mobile phase compositions and four columns were compared for the analysis of 78 compounds with a wide range of physicochemical properties (logP range from −1.46 to 5.48), and analyte sensitivity was compared between methods. The pH, additive type, column, and organic modifier had significant effects on the analyte response factors, and acidic mobile phases (e.g. 0.1% formic acid) yielded highest sensitivity. In some cases, the effect was attributable to the difference in organic modifier content at the time of elution, depending on the mobile phase and column chemistry. Based on these findings, 0.1% formic acid, 0.1% ammonia and 5.0 mM ammonium fluoride were further evaluated for their performance in non-targeted LC/ESI/HRMS analysis of wastewater treatment plan influent and effluent, using a data dependent MS2 acquisition and two different data processing workflows (MS-DIAL, patRoon 2.1) to compare number of detected features and sensitivity. Both data-processing workflows indicated that 0.1% formic acid yielded the highest number of features in full scan spectrum (MS1), as well as the highest number of features that triggered fragmentation spectra (MS2) when dynamic exclusion was used.

Surface properties of alkali silicate glasses: Influence of the modifiers.

Using large-scale molecular dynamics simulations, we investigate the surface properties of lithium, sodium, and potassium silicate glasses containing 25 mol % of alkali oxide. The comparison of two types of surfaces, a melt-formed surface (MS) and a fracture surface (FS), demonstrates that the influence of the alkali modifier on the surface properties depends strongly on the nature of the surface. The FS exhibits a monotonic increase of modifier concentration with increasing alkali size while the MS shows a saturation of alkali concentration when going from Na to K glasses, indicating the presence of competing mechanisms that influence the properties of a MS. For the FS, we find that larger alkali ions reduce the concentration of under-coordinated Si atoms and increase the fraction of two-membered rings, implying an enhanced chemical reactivity of the surface. For both types of surfaces, the roughness is found to increase with alkali size, with the effect being more pronounced for the FS than for the MS. The height-height correlation functions of the surfaces show a scaling behavior that is independent of the alkali species considered: The ones for the MS are compatible with the prediction of the frozen capillary wave theory while the ones for the FS show a logarithmic growth, i.e., on the nanoscale these surfaces are not self-affine fractals. The influence of the modifier on the surface properties are rationalized in terms of the interplay between multiple factors involving the size of the ions, bond strength, and charge balance on the surface.

A novel strategy accomplished by cell wall annular thickening with polymer for improving the mechanical performances of plantation wood

Inspired by the multi-level physiological structure of wood cell wall, a bionic method accomplished by annular thickening of cell wall by polymer was proposed to improve the mechanical performances of plantation wood. The thickening mechanism and the contribution of annular thickening of cell wall to the mechanical performances of plantation wood was analyzed. Results indicated that wood cell wall could be annularly thickened by the modification system prepared with water-soluble vinyl monomers and organic solvent. The flexural, compressive and impact strengths of plantation wood were synchronously improved after the treatment. The modulus of rupture of the prepared wood with 22.4% weight percentage gain reached up to 95.7 MPa which was higher than the TB 17 requirement based on the Chinese National Standard (GB 50206). The thickening degree which could be controlled by adjusting modifier concentration was closely related to the mechanical performance of treated wood.

A Comparison Between Trioctylamine (TOA) and Tris(2-Ethylhexyl) Amine (TEHA) in Solvent Extraction of Sulfuric Acid*

ABSTRACT The study investigated the behavior of two amines, Trioctylamine (TOA) and Tris(2-Ethylhexyl) amine (TEHA), in the sulfuric acid extraction system, with varying concentrations of extractants and modifiers, as well as the temperature of the sulfuric acid extraction. The study found that TOA had a higher ability in the extraction of sulfuric acid and was less dependent on temperature. However, an increase in the initial sulfuric acid concentration resulted in a drop in acid extraction percentage when TOA was employed, while such a drop was not observed in the case of TEHA. The study also illustrated the necessity of using Octanol as a modifier, with different minimum levels required for TOA and TEHA. Additionally, Octanol showed a positive effect on the extraction level of sulfuric acid in the TEHA – H2SO4 extraction system, which can be considered an advantage in the facile stripping of the loaded organic phase. The slope analysis method revealed that more than 1 mol of TOA is necessary to extract 1 mol of sulfuric acid, while 1 mol of TEHA can absorb 2 mol of sulfuric acid. FTIR spectra analysis confirmed TOA's participation in the extraction of sulfuric acid and provided insights into the chemical bonds formed. Overall, the study provides a comprehensive understanding of the solvent extraction of sulfuric acid and can be useful in optimizing the extraction process for industrial applications.

Heterogenous adsorption mechanisms for describing enantioselective retention in normal-phase liquid chromatography

In this study, the enantioselective retention behaviors of methyl mandelate (MM) and benzoin (B) were investigated using Chiralpak IB as a sorbent and ethanol, 1-propanol, and 1-butanol as solvent modifiers in the normal-phase mode. For both MM and B, similar chiral recognition mechanisms were observed, potentially involving at least two types of chiral adsorption sites. With a retention model describing local retention behaviors, an enantioselectivity model based on a three-site model was proposed to describe the data. Fitted parameters were also used to analyze the contributions of each type of adsorption site to the apparent retention behavior. Combining the local retention model with the three-site model provided a qualitative and quantitative explanation for the correlation between modifier concentration and enantioselectivity. Overall, our results indicated that heterogeneous adsorption mechanisms are a key aspect in understanding enantioselective retention behaviors. Distinct local adsorption sites contribute differently to apparent retention behaviors, with these contributions being influenced by the mobile phase composition to varying degrees. Hence, enantioselectivity changes with variations in modifier concentration.

Kinetics of the enzyme titration process by reversible modifiers

The effect of reversible modifiers on the initial rate of enzyme catalysed reactions has been investigated in a quasi-equilibrium approximation using the general modifier mechanism of Botts and Morales. It has been shown that, when investigating the dependence of the initial rate on the modifier concentration at a fixed substrate concentration, the kinetics of enzyme titration by reversible modifiers can generally be described using two kinetic constants. Just as the dependence of the initial rate on the substrate concentration (at a fixed modifier concentration) is described using two kinetic constants: the Michaelis constant Km and the limiting rate Vm. Only one constant M50 is needed to describe the kinetics of linear inhibition, and in the case of nonlinear inhibition and activation, along with M50 the constant QM is also needed.Knowing the values of the constants M50 and QM, it is possible to unambiguously determine the modification efficiency, that is, to calculate how many times the initial rate of the enzyme catalysed reaction will change when a certain modifier concentration is added to the incubation medium.The properties of these fundamental constants have been analysed in detail and the dependence of these constants on other parameters of the Botts-Morales model have been shown. Equations describing the dependence of relative reaction rates on the modifier concentration using these kinetic constants are presented. Various ways of linearising these equations for calculating the kinetic constants M50 and QM from experimental data are also presented.

Temperature susceptibility of asphalt binder modified with palm oil mill sludge

Modification of asphalt binder is continuously gaining interest as a result of the depletion of this non-renewable materials and their expensive price. There is a drive to use modifiers in asphalt including agricultural waste. In this study, palm oil mill sludge (POMS) was employed. The penetration grade of 60/70 as base binder incorporating with 1%,2%,3%,4% and 5% POMS were investigated for temperature susceptibility. These modified binders were tested for penetration, softening point, and viscosity. Subsequently, the penetration index (PI), penetration-viscosity number (PVN), activation energy (Ea) and viscosity-temperature susceptibility (VTS) were used to analyze the effect of POMS on the temperature susceptibility of asphalt binder. The results showed that the addition of POMS to the asphalt binder under unaged circumstances increased the penetration value from 66.56 dmm to 80.08 dmm and decreased the softening point from 49.25°C to 45.6°C for 4% POMS which indicates the softening effect of the asphalt binder. In contrast, following short-term ageing, the penetration value decreased as the softening point increased, showing that the modified asphalt binder stiffened after aging. According to the PI, PVN, Ea and VTS values of the modified POMS asphalt binder, the addition of POMS decreased its temperature susceptibility. Based on the ranking, 4% POMS was found as the best concentration of asphalt binder modifier. In conclusion, the use of appropriate amounts of POMS as an asphalt modifier is possible and provides a possible way to reuse POMS.

Semi-empirical description of a retention of small organic probes on AtlantisTM Premier BEH C18 AX mixed-mode column under varying pH and organic modifier conditions

Mixed-mode chromatography is a widely used analytical method that utilizes multiple separation mechanisms in one chromatographic column; frequently a reversed-phase and ion-exchange interactions. Adequate understanding of how the individual interactions influence the overall retention of the analyte is important for fast and effective design of mixed-mode-based methods. Previous attempts to derive semi-empirical mathematical models of mixed-mode chromatography were limited to a narrow range of analytes and did not consider the effect of organic modifier in the mobile phase. In this paper, we attempt to improve upon the previous models by extending the range of classes of analytes to weak acids and bases and including the effect of organic modifier. An improved semi-empirical model was derived that captures all important retention trends of the combined effect of reversed-phase and ion-exchange retention mechanisms for all tested classes of analytes and up to 30% (v/v) organic modifier content.

PROPERTIES OF GLASSES IN THE Ag2S–GeS2–As(Sb)2S3 SYSTEMS

The characteristic temperatures for individual glass samples of quasi-ternary systems Ag2S–GeS2–As(Sb)2S3 were determined by differential thermal analysis method. Obtained data show that the glass transition temperature of the alloys is in the range typical of chalcogenide glasses. It was established that the glass transition temperature increases with the modifier content in the range of 402-421 K and 373-438 K for the Ag2S–GeS2–As(Sb)2S3 systems, respectively. For the constant Ag2S concentration, the value of the glass transition and crystallization temperatures increases with the content of germanium (IV) sulfide. The reduced glass transition temperature Tgr was calculated from obtained results which lies in the range of 0.62-0.73 and 0.59-0.70 for the glasses of the Ag2S–GeS2–As(Sb)2S3 systems, respectively, which indicates the high capacity of the samples to glass formation. Optical absorption spectra were measured at 297 K. The band gap energy Eg of the glasses of the Ag2S–GeS2–As(Sb)2S3 systems was estimated from the data on the spectral distribution of the absorption coefficient in the region of the absorption edge. It was determined that the absorption edge shifts to longer wavelengths with the increase of the GeS2 content in glasses, while the energy position of the absorption edge increases. Ade crease in the band gap energy is observed for all glass samples when a modifier is introduced into the glass-forming matrix. The characteristic energy of the degree of tailing of the absorption edge is in the range from 0.066 to 0.079 eV for all studied glass samples.
 Keywords: сhalcogenide glasses; quasi-ternary systems; glass-formation; characteristic temperatures; band gap energy.

Influence of polyethyleneimine layer and zinc nitrate on morphology and structure of PES‐based membranes with highly selective properties

AbstractIn this paper, nanofiltration (NF) polymer membranes based on polyestersulphone (PES) were prepared by the phase inversion method. Polyethyleneimine (PEI) and zinc nitrate (Zn(NO3)2) as a surface modifier and glutealdehyde (GA) as cross‐linker was used. Fourier transform infrared spectroscopy analysis (FTIR) was used to confirm the chemical composition on the membrane surface. Membranes were also characterized using field emission scanning electron microscopy (FESEM) and 3D surface images. Water contact angle, average pore size and porosity measurements, water flux, salt rejection, and membrane anti‐fouling ability were discussed. Modified membranes showed a smoother surface than the original membrane. The amount of pure water flux decreased with increasing the concentration of modifiers at the surface, but the yield of Na2SO4 salt increased, 53% in virgin membrane and 83% in M3 membrane. Modified membranes had better anti‐fouling and hydrophilicity properties than primary membranes. The lowest contact angle value was 26.2° for M4. Also, the best anti‐clogging comparable properties were for the M3 membrane with FRR = 63.37%, Rr = 10.69%, Rir = 36.6%, and Rt = 47.3%. By increasing the concentration of modifiers, the removal of CuNO3− and CuSO4 improved that the M1 membrane (97.59%) had the highest Cu(NO3)2 separation and the M4 membrane (87.5%) had the most increased CuSO4 separation.

Preparation and application of modified carbon black nanofluid as a novel flooding system in ultralow permeability reservoirs

Conventional flooding systems have very low recovery rates in ultralow permeability reservoirs in virtue of the characteristics of high injection pressure, low permeability and small pores in such reservoirs. In this study, a novel surface-modified carbon black (MCB) nanofluid was prepared as a flooding system to resolve this problem. The preparation process of MCB nanoparticles was divided into three stages: (1) oxidation of carbon black (CB) nanoparticles, (2) acyl chlorination of oxidized carbon black (OCB) nanoparticles and (3) grafting of active groups onto the surface of acyl chloride carbon black (ACB) nanoparticles, and the main synthesis conditions, such as modifier concentration and grafting temperature, were optimized. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis indicated that the factional groups were successfully introduced onto the surface of CB nanoparticles, and the crystallinity of CB nanoparticles decreased gradually during the reaction process. Additionally, the dispersed stability, temperature resistance, salinity tolerance, wettability alteration and oil stripping ability were evaluated so as to obtain the performance of the MCB nanofluid. The results show that the average size of the MCB nanoparticles is approximately 72.3 nm, and the dispersed stability of the MCB nanofluid is much better than that of the CB nanofluid. Compared with the carbon black (CB) nanofluid, the MCB nanofluid shows stronger wettability alteration and oil stripping ability, and can also withstand the high temperature and high salt environment of oil reservoirs. 1 PV of MCB nanofluid can enhance oil recovery by 28.9%. Furthermore, the enhanced oil recovery (EOR) mechanisms for the MCB nanofluid are revealed through analysis of low oil–water IFT (IFT), wettability alteration and Wasan’s theory of structural disjoining pressure. This new type of environment-friendly flooding system injects vitality into the development of ultralow permeability reservoirs.

Preparation Scheme Optimization of Thermosetting Polyurethane Modified Asphalt.

To solve the issue of the poor temperature stability of conventional modified asphalt, polyurethane (PU) was used as a modifier with its corresponding curing agent (CA) to prepare thermosetting PU asphalt. First, the modifying effects of the different types of PU modifiers were evaluated, and the optimal PU modifier was then selected. Second, a three-factor and three-level L9 (33) orthogonal experiment table was designed based on the preparation technology, PU dosage, and CA dosage to prepare the thermosetting PU asphalt and asphalt mixture. Further, the effect of PU dosage, CA dosage, and preparation technology on the 3d, 5d, and 7d splitting tensile strength, freeze-thaw splitting strength, and tensile strength ratio (TSR) of the PU asphalt mixture was analyzed, and a PU-modified asphalt preparation plan was recommended. Finally, a tension test was conducted on the PU-modified asphalt and a split tensile test was performed on the PU asphalt mixture to analyze their mechanical properties. The results show that the content of PU has a significant effect on the splitting tensile strength of PU asphalt mixtures. When the content of the PU modifier is 56.64% and the content of CA is 3.58%, the performance of the PU-modified asphalt and mixture is better when prepared by the prefabricated method. The PU-modified asphalt and mixture have high strength and plastic deformation ability. The modified asphalt mixture has excellent tensile performance, low-temperature performance, and water stability, which meets the requirements of epoxy asphalt and the mixture standards.