CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Youchao Chen,Junxian Huang,Yaseen Muhammad,Zhenxia Zhao,Shencheng Fan,Wenjie Luo,Jing Li
Based on the four-component separation technology of asphalt, the influence mechanism of carbon nanotubes (CNTs), graphene microsheets (GNPs) and graphene oxide (GO) in SBS-modified asphalt four-component was systematically analyzed by combining macroscopic properties and microscopic characteristics, as well as exploring the morphological distribution of SBS in asphalt four-component. According to the results of Fourier transform infrared spectroscopy and field emission scanning electron microscopy, the modification mechanism of asphalt by three types of carbon nanomaterials follows two pathways: chemical reaction and physical blending. The addition of CNTs, GNPs, and GO results in the destruction of long carbon chains of the saturated fraction in SBS-modified asphalt, and promotes the aggregation of SBS in the asphaltene, as well as its dense distribution and crosslinking in the oil fractions. The results of the fluorescence microscopy test and phase separation test showed that the dispersing effect of the three carbon nanomaterials could alleviate the aggregation phenomenon of SBS, improve the mutual integration between SBS and matrix asphalt, and promote the storage stability of SBS-modified asphalt. Therefore, based on the excellent mechanical properties of the three carbon nanomaterials and their promotion of filling and crosslinking of SBS in asphaltene, they have made significant contributions to the mechanical properties of carbon nanomaterials-composite SBS modified asphalt. This can also be demonstrated by DSR testing and conventional physical property testing. This study hopes to provide a viable analytical route for the use of nanomaterials in modulating the four-component structure and improving the properties of asphalt.
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
Yanheng He,Tianwei Zhang,Ming Zeng,Hao Duan,Bing Zhang,Jianying Yu
To prepare SBS modified asphalt (SMA) waterproofing membrane with excellent self-healing performance, in this paper, four self-healing agents (ASHA-A, ASHA-B, ASHA-C, ASHA-D) with acylhydrazone bonds and carbon-carbon double bonds (C C) were synthesized, and were used to prepare self-healing SMA waterproofing membranes (SSMA-A, SSMA-B, SSMA-C, SSMA-D). The effects of ASHAs with different structures on the structure, high and low temperature properties, joint peel strength and self-healing performance of SSMAs were investigated. The Fourier transform infrared spectroscopy and fluorescence microscope results showed that acylhydrazone bonds of ASHAs were introduced into the chains of SBS molecules, and the SBS in SSMAs occurred crosslinking through the C C of ASHAs and SBS, the crosslinked network structures of SBS in SSMA-C and SSMA-D were denser and more complete because ASHA-C and ASHA-D contained more C C involved in the crosslinking reaction. The softening point and low temperature flexibility of SSMAs were enhanced by the formation of the SBS crosslinked network structure, and the optimum dosage of ASHAs was 0.6%. The joint peel strength of SSMA-A, SSMA-B, SSMA-C and SSMA-D increased by 26.68%, 31.25%, 49.52% and 56.97% compared to SMA. The introduction of acylhydrazone bonds with reversible fracture and rearrangement significantly improved the crack self-healing performance of SMA, the impermeability times of SMA, SSMA-A, SSMA-B, SSMA-C and SSMA-D were 13.28 min, 37.29 min, 42.53 min, 53.34 min and 59.67 min after self-healing at 40℃ for 8 h, which indicated that ASHA-D with benzene ring and multiple C C had the best improvement in self-healing performance of SMA.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Tianwei Zhang,Shanjun Gao,Yanheng He,Shangheng Zeng,Hao Duan,Yuhan Chen,Jianying Yu
Self-healing polymer modified bitumen based on dynamic chemical bonds is a potential approach to improve the durability of bitumen pavement and save fossil energy. Herein, a novel self-healing SBS modified bitumen on the basis of dynamic disulfide bonds and hydrogen bonds was prepared. Firstly, an aliphatic disulfide (A-ALD) with disulfide bonds and hydrogen bonds was synthesized. Then A-ALD/SBS modified bitumen (A-ALD/SMB) was prepared by blending A-ALD and SBS modified bitumen. The chemical structure and microstructure of A-ALD/SMB were evaluated. In addition, the self-healing performance of A-ALD/SMB at the macroscopic scale and the self-healing behavior at the molecular scale were investigated by a combination of fatigue healing test and molecular dynamics (MD) simulation. The chemical structure analysis showed the formation of disulfide bonds and hydrogen bonds in A-ALD, and A-ALD was successfully attached to the C C bonds in SBS. Fluorescent images revealed that a better network structure appeared in A-ALD/SMB and formed a two-phase continuous morphology. The optimal dosage of A-ALD in SBS modified bitumen was 0.6 %. The fatigue healing test results indicated that A-ALD markedly enhanced the self-healing ability of SBS modified bitumen, and prolonging resting time and raising healing temperature can increase the self-healing performance of A-ALD/SMB. When the damage degree, healing temperature, and resting time were 30 %, 30 °C, and 60 min, respectively, the healing rate of A-ALD/SMB was 98.5 %, which was 30.2 % higher than SMB. The MD simulation results showed that the A-ALD enhanced the molecular diffusion capacity of SBS modified bitumen, and crack healing time of A-ALD/SMB was earlier than that of SMB under the same conditions. When the healing temperature was 40 °C, the time for the A-ALD/SMB and SMB molecular chain segments to start contacting and healing was 27 ps and 49 ps, respectively, which was improved by 44.9 % for A-ALD/SMB compared to SMB. Furthermore, the self-healing behavior of A-ALD/SMB at the molecular scale was consistent with the self-healing performance at the macroscopic scale under different healing temperatures and damage degrees. This study provided a theoretical basis for exploring the self-healing mechanism of SBS modified bitumen.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Chaobo Jiang,Haonan Yan,Ce Wang,Shilong Zhang,Yanling Zhu,Hua Deng,Yongsheng Zhao,Guangcheng Zhang
The incorporation of dynamic covalent bonds (DCBs) has transformed thermoplastic elastomers into vitrimers. However, it still remains a challenge to solve the trade-off between mechanical properties and processability of vitrimer-like elastomers. In this work, poly(styrene–butadiene-styrene) (SBS) vitrimer with dual dynamic networks were prepared through thiol–ene click chemistry and reactive processing. By grafting 3-mercaptopropionic acid (MPA) onto SBS and subsequent cross-linking with zinc oxide and BDB, dynamic networks with zinc ion(Zn2+) coordination and dynamic boronic ester bonds were established. The structure and mechanical performance could be tailored by adjusting the ratio of the two networks. When increasing Zn2+ coordination bonds along with fixed BDB content, the gel content of SBS vitrimers varies from 30.62% to 69.54%. The dual-network sample demonstrated a synergistic effect with the highest elongation at break (526.41%) and a tensile strength of 13.40 MPa, outperforming single-network samples. All the SBS vitrimers show Arrhenius-type stress relaxation behavior, and the activation energy for dynamic bond exchange energy (Ea) of SBS with dual dynamic network was 76.69 kJ/mol. After three reprocessing cycles, the elastomer retained over 80% of its original mechanical properties. Therefore, this work offers a promising strategy for fabricating elastomers with excellent mechanical performance and recyclability, which is expected to have a significant impact on the design and preparation of high-performance elastomers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Bo Liang,Kai Shi,Yanfang Niu,Zhengchun Liu,Jianlong Zheng
Styrene-butadiene-styrene (SBS)-modified asphalt plays an integral role in asphalt pavements. To facilitate the understanding of the correlations between the physical and chemical properties of asphalt cement and SBS , a method for the direct quantitative determination of the SBS modification mechanism via potentiometric titration is proposed. This method will theoretically guide the processing design of SBS-modified asphalts. Potentiometric titration is applied to investigate the unsaturation of SBS-mixed, SBS-modified, and SBS/sulfur-modified asphalts with different SBS dosages ranging from 0% to 10%. The unsaturation of SBS-mixed asphalt exhibits a good linear increase with an increase in SBS dosage. A noticeable loss of SBS unsaturation occurs in SBS- and SBS/sulfur-modified asphalts after undergoing complete modification. In addition, unsaturation presents an evident inflection point at approximately 5 wt% SBS with an increase in SBS dosage. This finding indicates SBS changing from a dispersed phase to a continuous phase in the modified asphalts. Remarkably, the addition of sulfur can accelerate the emergence of an inflection point. Results corroborate that various types of virgin asphalt exhibit different inflection points. SBS/sulfur-modified asphalt demonstrates stronger chemical cross-linking than SBS-modified asphalt. These findings are further confirmed via fluorescence imaging, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Potentiometric titration potentially provides a direct quantitative method for probing the modification mechanism of and designing customized processing for SBS-modified asphalts.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Shilong Zhang,Chaobo Jiang,Ce Wang,Jialiang Li,Yuqi Ma,Yanling Zhu,Hua Deng,Yongsheng Zhao,Guangcheng Zhang
As a traditional block copolymer-type elastomer, the poly(styrene–butadiene–styrene) SBS elastomer has limited properties like weak heat/solvent/creep resistance and adhesive performance. In this work, the “melt-blending and ultraviolet (UV) post-treatment” method was used to activate a thiol–ene reaction between thiol-terminated boronic ester cross-linkers (BDB) and vinyl groups of SBS chains. In this way, it can effectively incorporate a dynamic boron–oxygen (B–O) network into SBS elastomers. When increasing the BDB content from 1 to 10 wt %, the gel content of SBS vitrimers varies from 18.76 to 83.91%. At the same time, the glass transition temperature (Tg) of the PB phase in SBS vitrimers increases from −87.87 to −73.25 °C and a rubbery plateau appears instead of an instant rupture when the temperature rises above the Tg of the PS phase. The stress relaxation behavior of all SBS vitrimers shows an Arrhenius-type temperature dependence, and the estimated bond-exchange activation energy (Ea) of SBS-BDB10 was 52.28 kJ/mol. Compared to the pure SBS elastomer, SBS vitrimeric elastomers show an increased Young’s modulus, creep resistance, and self-healing properties and maintain their rubber elasticity. Furthermore, the adhesive property to the metal was notably improved, achieving a lap-shear strength of up to 1.83 MPa. Therefore, it is demonstrated to obtain good reprocessability and improved physical properties via fabricating SBS vitrimers with dynamic B–O networks.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 306
·期 5
·2000737
·
IF 4.367
Qiang Wang,Yu He,Qiuying Li,Chifei Wu
A Cooper(II) (Cu 2+ )-nitrogen coordination-crosslinked network is designed in poly(styrene-co-butadiene-co-styrene) (SBS) to change commercial elastomers into advanced soft materials. Herein, ligand groups into SBS molecular chains by the 3,6-di(2-pyridyl)-1,2,4,5-tetrazine (DPT) click reaction are first introduced. The results from fourier transform infrared (FT-IR), 1H-nuclear magnetic resonance, and X-ray photoelectron spectroscopy (XPS) are verified the successful modification of SBS. The DPT-grafted SBS could then coordinate with copper sulfate (CuSO 4 ) to form a Cu 2+ -nitrogen bond, which is further characterized using FT-IR, XPS, atomic force microscope, scanning electron microscope, and geometric structure calculations. After modifying SBS to form an SBS-DPT/CuSO 4 composite (SBS-DPT2-Cu10), the tensile stress is improved from 11.43 to 23.25 MPa, while the elongation at break is remained almost unchanged, and the corresponding toughness is increased from 33.21 to 63.26 MJ m –3 . Moreover, the dynamic nature of the Cu 2+ -nitrogen coordination bonds enables the SBS-DPT/CuSO 4 composite to exhibit sustained thermoplastic performance and excellent shape memory behavior under an external thermal stimulus.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Liangfeng Xiao,Weifeng Liu,Jinhao Huang,Hongming Lou,Xueqing Qiu
The technical enzymatic hydrolysis lignin (EHL) and alkali lignin (AKL) were pretreated via alkaline depolymerization and organic solvent extraction process, respectively. The molecular weight of lignin was lowered and the molecular weight distribution was narrowed, while the content of phenolic hydroxyl group increased after the pretreatment of alkaline depolymerization or solvent extraction. The lignin extracted with ethyl acetate got the lowest molecular weight and highest phenolic hydroxyl group content, showing even better free radical scavenging ability than the commercial Irganox1010. Lignin/SBS elastomer composites were prepared with even dispersion of lignin in the SBS matrix with an average particle size close to 40 nm. It was demonstrated that the alkali lignin extracted with ethyl acetate showed the best improvement on the antioxidant performance of SBS and was comparable to that of Irganox1010 in the SBS elastomer, showing great application potential.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yanheng He,Jiheng Jiang,Tao Zhang,Xiaobin Han,Quantao Liu,Tianwei Zhang,Hao Duan,Zhenyu Zou,Zizhou Shen,Jianying Yu,Shi Xu
The development of styrene-butadiene-styrene (SBS) block copolymer modified bitumen (SMB) waterproofing membrane with excellent anti-aging and crack self-healing properties is important to solve the persistent problems of building leakage. In this study, vinyltriethoxysilane modified montmorillonite (VTES-MMT) and acylhydrazone compound (AC) were synthesized and used to prepare a novel anti-aging and self-healing SMB. The structures of VTES-MMT and AC were characterized, and the effects of VTES-MMT and AC on the microstructure, physical properties, mechanical properties, self-healing properties and aging properties of SMB were systematically investigated. The results show that vinyl-functionalized VTES-MMT and AC with vinyl ends were successfully synthesized and they have good thermal stability. VTES-MMT and dynamic acylhydrazone bonds were introduced into SMB through the cross-linking reaction between vinyl and SBS. VTES-MMT and AC improved the dispersion stability, physical and mechanical properties of SMB and endowed it with excellent crack self-healing properties. Compared with SMB, the healing index (HI) and the impermeable pressure of VTES-MMT/AC/SMB increased by 52.86 % and 0.41 MPa. The introduction of VTES-MMT and dynamic acylhydrazone bonds effectively mitigated the oxidative condensation of bitumen and the chain-breaking degradation of SBS during the aging process. Compared with SMB, the low temperature flexibility increment, elongation at break retention rate and peel strength retention rate of VTES-MMT/AC/SMB were reduced by 6℃, 18.66 % and 21.76 % after UV aging, respectively. The cracks of VTES-MMT/AC/SMB could still be healed completely after aging, and its HI and impermeability pressure decreased by only 14.38 % and 0.08 MPa after UV aging, which implied that the synergistic effect of VTES-MMT and AC significantly improved the aging resistance of SMB, and VTES-MMT/AC/SMB still maintained a good crack self-healing ability after aging.
研究领域:
材料科学
·
高分子化学
·
土木工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2021
·
IF 1.82
Qingle Zhang,Yiqing Shao,Chengmeizi Wang,Lu Wang,Huimin Zhou,Xin Xia
To develop a fluorine-free material of acidproof and breathable fabric, styrene–butadiene–styrene (SBS) blended with pitch was directly deposited on polyester/cotton blended fabric through electrospinning to fabricate a nanofibrous membrane composite fabric. Acrylic acid (AA) and methyl methacrylate (MMA) were used to graft SBS to improve compatibility between SBS and pitch, and the modified temperatures were set at 40°C, 60°C and 80°C. The effects of different grafting monomers and temperatures on the properties of SBS/pitch membrane composite fabrics were explored by Fourier transform infrared spectral analysis; morphological structures, acid-resistant properties and breathability (vapor permeability and air permeability) were also examined. The results showed that modified SBS/pitch membrane composite fabrics possessed good acid resistance and modest breathability. SBS-g-MMA/pitch (means SBS grafted by MMA) exhibited the highest acid resistance due to more evenly distributed beads than original SBS/pitch membrane composite fabrics and higher roughness than SBS-g-AA/pitch (means SBS grafted by AA) membrane composite fabrics. By systematically changing the grafting temperature, SBS-g-MMA/pitch membrane composite fabrics for which SBS was grafted by MMA at 80°C presented appropriate air permeability (120.5 mm/s), modest water vapor transport rate (13,656.45 g/(m2·d)), good tensile strength (1203 N) and bursting strength (616 N), and the best acid resistance (143°); meanwhile the acid penetration level reached level 3, which was attributed to the low surface energy caused by the fused ring from the pitch and the rough surface caused by the micro-beads in the nanofibers. The obtained modified SBS/pitch membrane composite fabric could be potentially applied in acidproof fabrics.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Qingyuan Ma,Hongwei He,Wenwen Yu,Jianjun Xu,Quanxin Xu,Jiaqi Xue,Yushi Jin,Rong Zhu,Chen Han,Zhengkun Wang,Chen Cui,Jie Ma,Fuyong Liu,Heng Zhang,Huayun Du
Highly efficient regeneration of the aging SBS modified bitumen (SMB) is crucial for promoting the achievement of low-carbon development goals. Restoring the structure or performance of the aged SBS is the focus of the present work. Many studies have proved that the high temperature performance of aging SMB is deteriorated by using epoxy-type structural repair agent. Literatures have proved that epoxy-type structural repair agents with benzene ring can make the high temperature performance improve slightly. Therefore, it is necessary to propose a method that can make the high temperature performance improve greatly. In this paper, a rejuvenator containing trimethylol propane triglycidyl ether (TMPTE) combined with vegetable oil (VO) was selected. At the same time, the epoxy structural repair agent containing benzene ring, i.e., E51 epoxy resin (ER) was also selected to compare these two rejuvenators on recovering the comprehensive properties of aging SMB. Through GPC, FM, AFM and TGA tests, ER repair agent has good recovery effect for SBS network structure and adhesion performance for aging SMB. While TMPTE repair agent has good recovery effect for high temperature stability of the aged SMB and molecular weight of the aged SBS. Through DSR and ductility tests, it was found that these two rejuvenators had outstanding recovery for low temperature performance of aging SMB. Through MSCR and soften point tests, it was found that the high temperature performance of the repaired SMB by TMPTE was close to non-aging SMB. This suggests that TMPTE/VO is more effective in restoring the high/low temperature performance of regenerated SMB as a whole. This study can provide guidance for the recovery of comprehensive performance of epoxy-type repair agents regenerated SMB in a cost-effective and environment friendly way.
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
·
2018
·
IF 3.485
Jingjing Si,Zhaoxia Jia,Junyan Wang,Xin Yu,Yang Li,Fuqiang Dong,Ruiling Jiang
The research evaluated the properties of cold-mixed epoxy asphalt (EA) and cold-mixed epoxy styrene–butadiene–styrene (SBS)-modified asphalt (ESA) for paving steel-deck bridges. Compared with ESA, EA showed longer pot life and better processability at ambient temperature, as revealed by curing rheology analysis. The cured EA showed higher glass-transition temperature, superior thermal stability, tensile strength and elongation at breaking than ESA. These may be as a result of: (i) the high thermal stability of asphalt, (ii) the formation of a cross-linking network in the cured material, and (iii) the good compatibility between the epoxy resin and the asphalt.
研究领域:
土木工程
·
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）