POLYMER DEGRADATION AND STABILITY
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2024
·
IF 6.3
Qing-Qing Bi,Ying-Ming Li,Lu He,De-Yi Wang
Although epoxy asphalt (EA) mixtures have been widely used for the pavement in tunnels, it was limited by its flammability, poor compatibility and low mechanical property. To solve the above problems, a compatibilized and toughening flame retardant (ESO-AA-DOPO) was prepared via the epoxidized soybean oil (ESO), arachidonic acid (AA) and 9,10-Dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO). The presence of ESO-AA-DOPO significantly improved the flame retardancy, in which passing the UL-94 V-2 rating. The peak heat release rate (PHRR) reducing by 46.2 % for EA/40A-ESO-AA-DOPO composites comparing to that of pure EA. The analysis of char residue confirmed that the catalytic formation of dense and continuous char layer residue with good thermal oxidation stability originating from the ESO-AA-DOPO. The initial stage viscosity of ESO-AA-DOPO modified EA was lower than that of pure EA. Under the action of aliphatic epoxy resin and double bond, the molecular chain of epoxy resin presented a network structure, the base asphalt was divided into micelles, and the overall distribution of EA system was a 3D networks “sea-island”, which ensuring the increase in the glass transition temperature (Tg) of the EA system. The tensile strength and elongation at break of EA/40A-ESO-AA-DOPO composites were 123 % and 207 % higher than those of pure EA attributing to the improved compatibility and the formation of 3D networks “sea-island” structure.
研究领域:
材料科学
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土木工程
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产品关联
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2023
·Vol. 29
·期 3
·482-492
·
IF 2.7
Jingjing Si,Xiaoyang Shao,Jie Li,Hui Ma,Junyan Wang,Wei Ruan,Xin Yu
As a green material for high-performance paving, cold-mixed epoxy asphalt (CEA) should be improved in compatibility, mechanical performance, and thermal stability. This work is going to estimate the potential of graphene oxide (GO) as an additive for preparing GO/CEA composites with different GO content from 0 to 0.2 wt%. The influences of GO on the structure and performances of CEA were evaluated by Fourier transform-infrared spectrum, fluorescence microscopy, viscosity, thermogravimetric analysis, tensile test, and dynamic mechanical analysis. Results showed that the functional groups on GO reacted with CEA and improved the compatibility of epoxy resin and asphalt. The viscosity of the GO/CEA composites increased slightly and the pot life decreased significantly, with GO loading increasing. The cured GO/CEA composite with 0.1 wt% GO had the best heat resistance and showed a gentle thermal decomposition. GO improved the toughness of the cured CEA and had a certain weakening effect on its strength. The introduction of GO lowered the glass transition temperature of the cured CEA from 51.4 to 47.1 °C and decreased its storage modulus. The preliminary exploration of this study shows that the modification of GO for CEA is feasible, and it is expected to prolong the service life of CEA.
研究领域:
材料科学
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土木工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Pavement Engineering
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2024
·
IF 3.4
Jingjing Si,Xiaoyang Shao,Wuyang Wei,Bicheng Wei,Junyan Wang,Xiaojuan Jia,Gongying Ding,Yaqi Tang
To improve the compatibility of asphalt-epoxy and mechanical properties of cold-mixed epoxy asphalt (CEA), epoxy-ended hyperbranched polymer (EHBP) was grafted on the surface of graphene oxide (GO) nanoplates to synthesize GOEHBP as a compatilizer. The chemical structures and micromorphology of GOEHBP were analysed through Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, thermo gravimetric analysis and transmission electron microscopy. The CEA modified by EHBP and GOEHBP was investigated by tensile test, dynamic thermomechanical analysis, viscosity test, fluorescence microscope experiment, FTIR analysis and XPS analysis. The results showed that the EHBP was successfully grafted onto the surface of GO via chemical reaction, and the GO was partially reduced. The mechanical properties of CEA modified by EHBP are obviously improved, and the elongation at break was increased by 74.5%. The glass transition temperature of CEA modified by GOEHBP was increased to 62.58°C. At high temperature (≥40°C), the E′ of CEA modified by GOEHBP was larger than that of the CEA, indicating that GOEHBP can improve the high-temperature deformation resistance of CEA. The addition of GOEHBP can improve the compatibility of asphalt-epoxy, thus improving the toughness of CEA.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yujie Wang,Xili Yan,Kenan Li,Siqi Li,Tao Ai,Fengrong Shi
Conventional epoxy asphalt is difficult to reuse due to its thermosetting inability to heal and reprocess. In this study, using dimer acid (DA) and zinc acetate (Zn(OAC) 2 ) as curing agent and catalyst, respectively, and the hydroxyl-ester bonds were introduced into the dynamic crosslinking network system of the asphalt, a highly compatible epoxy asphalt DEA with heat recovery performance was designed. On this basis, the effects of different contents of capped hyperbranched polyester HP102 on the mechanical properties, low-temperature properties, and compatibility of DEA were investigated. The results showed that the base asphalt was successfully grafted with hydroxyl and ester groups, and this chemical modification effect reduced the polarity between the asphalt phase and the resin phase, resulting in a notable improvement in the compatibility of DEA compared with commercially available epoxy asphalt. The introduced HP102 improves not only the low-temperature ductility of the material but also its structural presence of -COO- groups, which can be further used to realize the dynamic exchange and reorganization of hydroxyl-ester bonds, which contributes to the modulus relaxation of the material and enhances its mechanical properties and self-healing ability. The highly branched structure of HP102 increases the unoccupied space and undergoes stress relaxation, which contributes to the improvement of the low-temperature ductility of the material. In addition, the cyclic tensile test results show that the mechanical property recovery rate can reach 86.7 % when hot-pressing processed at 180 °C for 5 h, which confirms that the epoxy asphalt under the reversible covalent crosslinking network possesses non-negligible recycling potential, and provides an engineering application reference for the hot-pressing recycling of epoxy asphalt.
研究领域:
材料科学
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化学工程
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道路工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 17
·4403
·
IF 3.1
Jian Wang,Maoan Wang,Shuwen Xu,Fenglei Zhang
In this study, a self-healing epoxy asphalt material was developed by incorporating coumarin groups. This material achieved microcrack self-repair under UV irradiation at 50 °C. Fluorescence microscopy observations and mechanical performance tests demonstrated significant advantages in crack filling and mechanical property recovery after repair, with the fracture toughness of the repaired epoxy asphalt reaching 69% of that in its original state. Furthermore, the synergistic effect of temperature and UV irradiation in the self-healing process enhanced the material’s durability and service life. This research offers new insights and methods for developing more durable and long-lasting self-healing asphalt materials, showcasing the great potential of smart materials in infrastructure applications.
研究领域:
材料科学
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土木工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Road Materials and Pavement Design
·
2022
·
IF 3.805
Jingjing Si,Junyan Wang,Yang Li,Junfei Ma,Wei Ruan,Xin Yu,Ruiling Jiang
The graphene oxide (GO) was used to improve the mechanical performances of epoxy asphalt (EA) by preparing GO/EA composite. The influence of the GO dosage on the micro-structure, curing rheology, mechanical and thermal properties of GO/EA was investigated. According to the XRD and Fourier transform infrared spectra, the GO was exfoliated in the EA matrix and modified EA by non-covalent strategy. GO decreased the rotational viscosity of EA and increased the pot life. The GO/EA with 0.1 wt.% GO showed excellent toughness that the elongation at break was increased by 164%, and the tensile and pull-off adhesion strength were nearly equal to that of EA. The addition of GO improved the original thermal decomposition temperature (T5%), glass transition temperature (Tg), compatibility and stiffness of the EA. The improved mechanical and thermal properties of GO/EA may be attributed to (1) excellent performances of GO and (2) inhibiting effect of GO on the EA curing process.
研究领域:
材料科学
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土木工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Fenglei Zhang,Dongdong Han,Ning Xu,Xing Cui,Lei Zhang
Epoxy asphalt, a thermosetting polymer, is characterized by stable, irreversible internal chemical bonds that prevent recovery and spontaneous micro-crack healing, unlike conventional asphalt. This study introduces a renewable nano-modifier synthesized via esterification of carboxyl-functionalized carbon nanotubes (CNTs-COOH) and furfuryl alcohol (FA), termed CNTs-FA. The successful synthesis of CNTs-FA was confirmed through various microscopic techniques. Integrating CNTs-FA into epoxy asphalt materials, the optimal dosage was identified as 0.05% of the total epoxy asphalt mass using tensile tests and fluorescence microscopy. Thermal reversible effects and mechanisms were further analyzed through multiple regeneration cycles using tensile properties, fluorescence microscopy, and infrared spectroscopy. The study elucidates that the thermal reversibility in epoxy asphalt is facilitated by the Diels-Alder (DA) reaction between the conjugated diene structure in FA and the curing agent oleylamine. This research provides an effective solution to the non-recoverability and unrepairable micro-cracks of traditional epoxy asphalt mixtures. Highlights CNTs-FA was successfully prepared by esterification reaction. Using nano modification methods, introduce DA reaction into curing system. Renewable function of epoxy asphalt by DA reversible reaction.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
·
IF 5.9
Panpan Song,Liuping Du,Jiuyin Pang,Guiquan Jiang,Jianmin Shen,Yanli Ma,Shixue Ren,Shujun Li
Conventional epoxy asphalt is a thermosetting material that is difficult to reprocess and cannot be easily recycled after disposal. In this study, a lignin-based epoxy asphalt (ELEA) with thermoplastic and thermosetting properties was prepared by introducing a lignin-based vitrimer system, which has a dynamic, covalently bonded, cross-linked ester network, into the asphalt. The mechanical properties (tensile strength, 1.605 MPa; elongation at break, 382.38 %) also meet the requirements of epoxy asphalt for steel bridge deck pavement. The viscosity, thermal properties and high-temperature reversibility of ELEA show that ELEA has good operability, thermal stability and potential for recycling, in line with the trend towards the development of a circular economy. The use of biomass-based derivatives for the epoxy resin and curing agent in ELEA also reduces dependence on non-renewable petroleum resources and provides a useful reference for the high-value and efficient development and utilization of industrial lignin.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Pavement Engineering
·
2022
·
IF 4.178
Junyan Wang,Xin Yu,Gongying Ding,Jingjing Si,Miaomiao Xing,Renxuan Xie
Biobased cold-mix epoxy asphalt (BCEA) was prepared by adopting biodiesel and epoxy soybean oil as asphalt solvent and compatibilizer. The strength and toughness attenuation laws under freeze–thaw (FT) cycles of BCEA were studied through tensile tests, flexural tests, and dynamic mechanical analysis. The attenuation mechanism was explored through scanning electron microscopy, Fourier transform infrared spectroscopy and water absorption tests. The results showed that the first FT cycle significantly weakened the strength and toughness of BCEA. After the third cycle, the attenuation rate of storage modulus, loss tangent, and glass transition temperature of BCEA declined. The attenuation mechanism of BCEA is as follows: (1) post-curing and destruction of the cross-linking network, (2) agglomeration and aging of asphalt, and (3) diffusion and reaction of water. This research provided a theoretical basis for the application of BCEA.
研究领域:
材料科学
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土木工程
✓ 已验证
产品关联
DOI
高影响因子
Road Materials and Pavement Design
·
2022
·
IF 3.805
Gongying Ding,Xin Yu,Junyan Wang,Xingmin Liang
The influence of formulation components of cold-mixed epoxy asphalt (CMEA) on the corresponding mechanical properties was studied. For the purpose of minimising the number of experiments, the simplex-centroid design method was used as an effective tool for experimental design. Original asphalt, solvent, epoxy resin and additives were taken into consideration as important factors at different levels. Tensile strength and elongation at break at 25 ℃ and -10 ℃ were chosen as the key responses. Moreover, the workability performance and optimised CMEA were studied. Finally, the tensile cross-sectional fracture mechanism of CMEA was studied with scanning electron microscopy (SEM). The results indicated that the simplex-centroid design was an effective method for optimising the composition of the CMEA. Good agreement was found between the proposed model and experimental measurements. The CMEA pot life first increased and then decreased with increasing environmental temperature, and solvent in the CMEA could weaken the ductility.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Junyan Wang,Xin Yu,Jingjing Si,Xiaoyang Shao,Shuang Zhao,Gongying Ding
The compatibility of cold-mixed epoxy asphalt (CEA) significantly influences its mechanical properties, primarily mediated by the epoxy group content within CEA. However, the feasibility and mechanisms for regulating the external epoxy group content to achieve optimal performance have yet to be explored thoroughly. Herein, soybean oil, epoxidized soybean oil , and epoxy-terminated hyperbranched epoxy resin (EHER) were used to construct CEA with different external epoxy group contents, and their effects and mechanisms on the compatibility and mechanical properties of CEA were investigated based on experiments and molecular dynamics simulation. Our findings suggest that maintaining an external epoxy group content between 8.4%∼11.4% in the CEA blend and below 12.17% in the cured CEA is crucial. These criteria can be met by adding no more than 5 wt% EHER. CEA with 3 wt% EHER exhibited the most balanced compatibility and mechanical properties, characterized by a pot life of 91 min, a tensile strength of 5.02 MPa, an elongation at break of 61.3%, and a tensile toughness of 1.58 MJ/m 3 . The presence of external epoxy groups increased the cohesive energy density and the solubility parameter difference between epoxy resin and asphalt prior to curing, forming a "sea-island" structure with varying particle sizes, primarily comprising small-sized particles. This structure was preserved post-curing, establishing a stable system with minor energy alterations. Simultaneously, EHER enhanced the molecular rigidity and uniformity of CEA, thereby improving its mechanical properties. It is recommended to relate epoxy group content in CEA blends with indicators of compatibility and mechanical properties, enabling better prediction.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS AND STRUCTURES
·
2019
·Vol. 52
·期 4
·1-11
·
IF 2.548
Si Jingjing,Li Yang,Yu Xin
Cold-mixed epoxy asphalt (CEA) is an eco-friendly material for steel bridge deck pavements. The effects of the asphalt on the curing behavior and mechanical properties of the CEA were studied. The pot life, curing characteristics, and curing kinetics of CEA blends were investigated by rotational viscosity testing, dynamic shear rheological analysis, and fluorescence microscopy. The results showed that the CEA pot life increased with asphalt content, and the curing apparent activation energy \( E_{k} \) of CEA-0.4 was more than two times higher than that of the epoxy resin. The curing reaction between the epoxy resin and curing agent was hindered by the asphalt. According to the FTIR and DSC results, the curing degree of the CEAs decreased with asphalt content. The elongation at break of the CEAs increased, while the tensile and adhesion strength decreased with asphalt content.
研究领域:
土木工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）