Carbon Letters
·
2023
·Vol. 34
·期 1
·343-350
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IF 4.5
Liu Bo,Li Xiaoliang,Li Sheng
In order to prevent early distress in asphalt pavement and save on subsequent operational and maintenance costs, modifying asphalt is an effective approach. Styrene–butadiene–styrene (SBS) block copolymers, due to their excellent physicochemical properties, have become a mature and widely used asphalt modifier. Carbon nanotubes (CNTs) possess advantages such as a large specific surface area and high modulus, which, when incorporated into asphalt, can enhance its deformation resistance. To analyze the effect of incorporating CNTs on SBS-modified asphalt (SBS-A), this study analyzed the influence of different CNT concentrations on the high and low-temperature performance and aging properties of SBS-A through penetration, softening point, ductility, dynamic shear rheometry, and short-term aging tests. The optimal CNT concentration was determined to be 1.0%. Furthermore, the changes in the modified asphalt during the aging process were analyzed using infrared spectroscopy.
研究领域:
土木工程
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 5
·
IF 1.866
Yijian Wu,Baoqing Shentu,Zhixue Weng
The SEBS/PP thermoplastic vulcanizates (TPVs) were prepared by melt blending. Di- tert -butyl peroxide (DTBP) was used as the curing agent in combination with trimethylopropane trimethacrylate (TMPTMA) and poly(styrene- b -butadiene-bstyrene) (SBS) as the coagents for the curing process. The synergistic effect of TMPTMA and SBS on the structure and properties of TPVs was studied by means of FT-IR, DSC, torque rheometer, and universal testing machine. Both SEBS and PP crosslinked and the network structure formed under the participation of TMPTMA and SBS. Compared with the sole addition of the coagent, simultaneous loading of both TMPTMA and SBS could provide the TPVs with better solvent-resistance and excellent mechanical properties. The crosslinking mechanism of the TPVs was also proposed. The slight lower value of T m for the TPVs indicated the improved miscibility between PP and SEBS due to the crosslinking reaction. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44392.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yixiang Chen,Xueli Fu,Yu Jiang,Wanqi Feng,Dan Yu,Wei Wang
Recently, the Ti 3 C 2 T x MXene-based flexible electronics have sparked wide attention in artificial health diagnosis, military security and human–machine interaction. High sensitivity, durability and multifunctionality are desired for strain sensors in long-term health detection. However, unevenness and low fastness of MXene and stretchable nanofibers lead to poor sensitivity and durability, building a strong interface to combine the two-dimensional (2D) MXene nanosheets uniformly along the 1D nanofibers and form a 3D connected electrical network benefits to the improvement of sensing performances. Herein, we propose a facile strategy to prepare a breathable and multifunctional all-nanofiber sensor based on MXene and styrene–butadiene–styrene (SBS) nanofibers. Firstly, the molecular chain of SBS introduces quaternary ammonium groups (NSBS) by thiol-ene click chemistry, hydrophilicity and mechanical properties of NSBS nanofibers are significantly improved, then MXene nanosheets can uniformly and firmly adsorb along with NSBS nanofibers by electrostatic interaction. The assembled MXene/NSBS sensor reaches an ultrahigh sensitivity of 62,194 in the wide detection range of 300% and stability over 3000 cycles for human joint motion, pulse and ECG signal wireless detection. Furthermore, the MXene/NSBS electrodes demonstrate temperature response and thermal management performance including Joule heating and photothermal performance. Consequently, this work indicates a promising candidate for real-time health diagnosis and artificial intelligence in next-generation multifunctional devices.
研究领域:
材料科学
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生物医学工程
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柔性电子
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Liqian Zhu,Li Xu,Suyun Jie,Bo-Geng Li
As the universal thermoplastic elastomers, poly(styrene- b -butadiene- b -styrene) (SBS) possesses good rubber elasticity and plasticity. However, the weak intermolecular forces upon which physical crosslinking relies also lead to unideal heat resistance, solvent resistance, and mechanical properties. Therefore, a massive challenge for developing SBS lies in the balance between performance and recyclability. Vitrimers are an emerging class of polymers with a crosslinked network containing dynamic covalent bonds. Herein, we demonstrated the preparation of SBS vitrimers based on disulfide exchange with high performance via epoxidation and esterification reactions. The introduction of chemical crosslinking significantly improved their mechanical properties and environmental resistance, especially solvent and heat resistance. Compared with pristine SBS, the tensile strength of SBS vitrimers could be increased from 1.9 MPa to 14.4 MPa without sacrificing the elongation at break. In the meantime, the dynamic nature enabled by disulfide exchange retained the recycling ability and endowed SBS vitrimers with some smart responses, including shape memory and self-healing properties. Furthermore, SBS vitrimers exhibited stronger adhesion in contrast with pristine SBS. This work provides a simple strategy for designing SBS networks with enhanced performance and good recyclability.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shumin Wang,Qingping Guo,Shujun Liang,Peng Li,Jujie Luo
A series of mixed matrix membranes (MMMs) were fabricated with Ni-MOF-74 as filler and poly (styrene-b-butadiene-b-styrene) (SBS) polymer as matrix materials for CH 4 /N 2 separation. MMMs were characterized by Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Gas separation behavior was investigated by measuring single and mixed gases. For the single gas, the CH 4 permeability of the MMMs incorporated with 15 wt% Ni-MOF-74 (Ni-MOF-74/SBS-15) reached 83.5 Barrer, which was 116% higher than that of SBS (38.6 Barrer), while its ideal selectivity remained the same. CH 4 permeability can further increase to 176.6 Barrer with the increase in temperature to 55 °C. For the CH 4 /N 2 (50/50 vol%) mixed gas, the Ni-MOF-74/SBS-15 sample exhibited increasing CH 4 permeability (74.7 vs 36.7 Barrer), while selectivity remained unchanged relative to that of the pure SBS membrane.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Sanpeng Mao,Shangheng Zeng,Linghuan Li,Xiaobin Han,Jianying Yu
To better enhance the improvement effect of natural bentonite on the comprehensive performance of styrene-butadiene-styrene thermoplastic elastomer modified bitumen (SMB), in this study, 3-(trimethoxysilopropyl) dimethyl octadecyl ammonium chloride (DC5700) was used for synchronous surface grafting and intercalation of bentonite (DC5700-Bentonite). Meanwhile, γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560) surface grafting bentonite (KH560-Bentonite) and octadecyldimethylbenzylammonium chloride (ODBA) intercalation bentonite (ODBA-Bentonite) were used as comparison samples. The structure and properties of the bentonite and organic bentonites (DC5700-Bentonite, KH560-Bentonite and ODBA-Bentonite) were tested by X-ray diffractometer (XRD), Fourier transform infrared spectrometer (FTIR), ultraviolet-visible spectrometer and contact angle measurement . The effects of bentonite and organic bentonites on physical, rheological and aging properties of SMB were investigated. FTIR and XRD results showed that KH560 was chemically grafted onto the surface of bentonite, ODBA was organically intercalated into the bentonite, while DC5700 achieved synchronous surface grafting and intercalation on the bentonite. Compared with KH560-Bentonite and ODBA-Bentonite, DC5700-Bentonite had the best lipophilicity and ultraviolet shielding ability. When the bentonite content was 4 wt% , KH560-Bentonite, ODBA-Bentonite and DC5700-Bentonite could increase the rutting factor of SMB by 2.9 ℃, 4.9 ℃ and 6.5 ℃, respectively, and reduce the ductility of SMB by 6.5 cm, 4.2 cm and 3.1 cm. Meanwhile, compared to SMBs containing KH560-Bentonite or ODBA-Bentonite, the SMB containing DC5700-Bentonite had the smallest creep stiffness at − 12 ℃, − 18 ℃, and − 24 ℃. The results indicated that DC5700-Bentonite was more conducive to increasing high-temperature performance of SMB than KH560-Bentonite and ODBA-Bentonite, and its adverse effects on low-temperature ductility and low-temperature cracking resistance of SMB were also significantly reduced. After thermal and ultraviolet aging, the deterioration extent of physical and rheological properties of SMB containing DC5700-Bentonite was significantly smaller than that of SMB containing KH560-Bentonite and ODBA-Bentonite. FTIR revealed that DC5700-Bentonite was more beneficial than KH560-Bentonite and ODBA-Bentonite in inhibiting the increase of carbonyl index and the decrease of butadiene index in SMB during aging. The comprehensive results revealed that compared to KH560 surface grafting bentonite and ODBA intercalation bentonite, DC5700 synchronous surface grafting and intercalation bentonite were more conducive to improving the physical and rheological properties, and aging resistance of SMB.
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
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Yanheng He,Sanpeng Mao,Tianwei Zhang,Shangheng Zeng,Hao Duan,Ronghua Zhuang,Jianying Yu
Styrene-butadiene-styrene triblock copolymer (SBS) modified bitumen (SMB) with excellent self-healing performance not only saves resources, but is also important for the sustainable development of pavement and construction industry. In this paper, a self-healing agent (SHA) with acylhydrazone bond was synthesized, and the dynamic acylhydrazone bond was introduced into the SBS molecular chains to prepare the self-healing SMB (SHMB). The structure of SHA was characterized, and the physical properties, chemical structure, microstructure and self-healing performance of the SHMB were investigated. Fourier transform infrared (FTIR) spectra and nuclear magnetic resonance spectra demonstrated that SHA was successfully synthesized. The physical performances of SMB were significantly improved by SHA and its optimal dosage was 0.6 %. FTIR indicated that the dynamic acylhydrazone bond was introduced into the SBS molecular chains, and formed hydrogen bonds in SHMB. The fluorescence microscope showed that SHMB had a denser network structure than SMB. The crack healing observation indicated that the crack healing speed of SHMB was much higher than that of SMB. The break tensile performance recovery showed that the recovery rate of elongation at break (R ε ) of SMB and SHMB were 14.38 % and 58.27 % after self-healing at 25℃ for 32 h, and the R ε of SMB and SHMB was elevated to 50.12 % and 92.58 % after self-healing at 40℃ for 4 h, which indicated that the introduction of dynamic acylhydrazone bonds greatly enhanced the self-healing ability of SHMB.
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
FUEL
·
2022
·
IF 8.035
Xiaobin Han,Sanpeng Mao,Shi Xu,Zhilong Cao,Shangheng Zeng,Jianying Yu
Efficient recycling of aged SBS modified bitumen (ASBS-MB) is one of the difficult problems in the field of pavement materials. In this study, isocyanate terminated long chain active rejuvenators (ITLCARs) for aged SBS were synthesized by the reaction of 2,4-toluylene diisocyanate (TDI)/ hexamethylene diisocyanate (HDI) and hydroxyl terminated polybutadiene (HTPB), namely T-HTPB and H-HTPB. And T-HTPB/H-HTPB and aromatic hydrocarbon oil (AO) were combined to form novel composite rejuvenators (NCRs), which were used to restore the properties of ASBS-MB. Afterwards, the effects of NCRs on physical properties, rheological properties and molecular weight distribution of ASBS-MB were investigated. FTIR results showed that ITLCARs were successfully synthesized. The results of gel permeation chromatography showed that NCRs had advantages in restoring the molecular weight of ASBS-MB to the level of SBS-MB. And the physical performances of ASBS-MB could be regenerated to the level of original SBS modified bitumen (SBS-MB) by NCRs. The high-temperature complex modulus and rutting factor of rejuvenated SBS modified bitumen (RSBS-MB) recovered by NCRs were better than those restored only by AO. Meanwhile, the low-temperature complex modulus and fatigue factor of RSBS-MB recovered by NCRs still had greater low-temperature properties. And the results of bending beam rheometer test indicated that creep stiffness and m-value of RSBS-MB at −12 ℃ and −18 ℃ meet the requirements of Strategic Highway Research Program. This study provides a novel rejuvenation method for the efficient recycling of ASBS-MB.
研究领域:
材料科学
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道路工程
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Tianwei Zhang,Shanjun Gao,Jianying Yu,Yanheng He,Xiaobing Han,Ronghua Zhuang
In this study, self-healing SBS (S-SBS) was first synthesized by introducing dynamic disulfide bonds into the molecular structure of SBS. Subsequently, a self-healing SBS modified bitumen (S-SMB) was prepared by blending of S-SBS and bitumen. The chemical structure of S-SBS and S-SMB was charactered by Fourier transform infrared spectrometer (FTIR) and Raman spectrometer. The physical properties, low-temperature rheological properties and self-healing performance of S-SMB were investigated. The results of FTIR and Raman showed that dynamic disulfide bonds were successfully introduced into the molecular structure of SBS. With the increase of dynamic disulfide bonds content in SBS molecular structure, the softening point and ductility of S-SMB enhanced, and the penetration was decreased. Fluorescence microscope showed that the S-SBS in S-SMB formed a complete crosslinking network structure compared to SMB. The bending beam rheometer illustrated that the low-temperature rheological properties and the cracking resistance of SMB were improved by introducing dynamic disulfide bonds. The fluorescence microscopy observation indicated that the crack in S-SBS can self heal. The fracture healing test and fatigue healing test demonstrated that dynamic disulfide bonds endow S-SMB with great self-healing performance. The fracture healing rate of S-SMB reached 58.7% after 4 h of healing, and the fatigue healing index reached 0.93 after 1 h of healing.
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
·
2022
·
IF 7.693
Junxian Huang,Yu Liu,Yaseen Muhammad,Jia Qing Li,Yuting Ye,Jing Li,Zhuang Li,Ruinan Pei
Composite material using glutaraldehyde (GA) cross-linked chitosan (CTS) and graphene oxide (GO-CTS-GA) was designed applying electrostatic interaction strategy under strong alkali environment. GO-CTS-GA was in turn applied to prepare styrene butadiene styrene (SBS) GO-CTS-GA/SBS composite modified asphalt (MA)_binder. The effect of GO-CTS-GA on the physical properties of SBS modified asphalt binder was investigated and its mechanism of action was analyzed. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy tests confirmed the retainment of GO flakes microscopic dimensions while compensating for the chemical structural defects and mechanical property damage of GO. The results of dynamic shear rheometer and multi-stress creep recovery tests indicated that the GO-CTS-GA/SBS-MA binder exhibited better viscosity performance and elasticity performance, rutting resistance and high temperature thermal stability. At 64 °C, the loss modulus of 0.10 % GO-CTS-GA/SBS-MA was 29.5 % and 25.2 % higher than that of SBS-MA and GO/SBS-MA, respectively. SEM and TEM analyses of the four components of asphalt binder before and after modification revealed that the change of asphaltene microscopic morphology seriously affects the stability of asphalt colloidal system. Fourier transform infra-red analysis of the MA binder revealed that the change of saturation fraction and colloidal polarity by GO-CTS-GA is responsible for the dispersion and cross-linking of SBS chain segments in the asphalt binder phase. This study provides important reference information for nanomaterials to change the macroscopic mechanical properties by modulating the microstructure, physical and chemical properties of asphalt binder at the micro and nano-scale.
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
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 42
·14826-14833
·
IF 7.059
Sijia Ren,Jiachun Feng
Water-responsive actuators have been of increasing interest in various applications. In this work, water-responsive actuators based on the bilayer composite film were prepared using commercialized PVA and SBS by a two-step solution casting method. In order to improve the adhesion between the PVA layer and SBS layer, SBS was firstly epoxidized to improve the polarity. Immediately after a thin film was formed on the surface of the epoxidized-SBS (E-SBS)/tetrahydrofuran solution, the PVA aqueous solution was poured onto the film and dried. It was found that the adhesive property between the two layers was improved and the adhesion strength reached 1005 kPa. The resultant bilayer film displayed the water-responsive two-way shape memory effect and exhibited excellent cyclic performance in five cycles. Flower-like and claw-like actuators based on the bilayer composite film were prepared and the actuation performance was demonstrated, suggesting their potential for applications in the fields of biomedicine and sensors.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2017
·
IF 3.169
Xiong Xu,Jianying Yu,Canlin Zhang,Zhilong Cao,Yi Gu,Lihui Xue
This paper mainly investigates the effect of the reactive rejuvenator diphenyl methane diisocyanate (MDI) and 1,4-butanediol diglycidyl ether (BUDGE) on chemical structures of aged SBS and rejuvenated structures, rejuvenation mechanisms, physical and rheological properties of UV-aged SBS modified bitumen (SMB). Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) show the hydroxyl and carbonyl groups have formed on aged SBS, which indicates that the broken-chain structures of SBS have formed after UV radiation. Meanwhile, the disappeared hydroxyl groups and formed amide bond in FTIR spectrum of MDI rejuvenated SBS, and the associated hydroxyl groups and another appeared carbonyl groups in FTIR spectrum of BUDGE rejuvenated SBS indicate MDI and BUDGE can act as a “bridge” to connect the broken-chain SBS together at 150 °C. Moreover, the performance results show rejuvenation temperature and time have little impact on the physical properties of rejuvenated SMB whatever the rejuvenator is selected. With the increasing content of MDI, the softening point of rejuvenated SMB can be improved and the ductility at low temperature remains almost unchanged. However, the softening point of rejuvenated SMB decreases and the ductility increases as the rising content of BUDGE. Phase angle results indicate MDI can further increase the elasticity of aged SMB, and BUDGE can to some extent restore the viscosity characteristic. From the results of fatigue and rutting performance, 1% BUDGE weakens the fatigue limit temperature of aged SMB from 20.1 °C to 14.9 °C and 1% MDI increases the rutting limit temperature from 79.6 °C to at least 80 °C, which indicates BUDGE and MDI can respectively help improve the fatigue resistance and rutting resistance. Based on the analysis of FTIR spectra and the relative functional group indexes, the results show the increasing concentration of I NH CO in MDI rejuvenated SMB and I C O C in BUDGE rejuvenated SMB, indicating the chemical reaction between reactive rejuvenators and aged SMB can be occurred. The rejuvenation of aged SMB with MDI or BUDGE abides by the addition reaction mechanism or condensation reaction mechanism.
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
危险品化学品经营许可证（带存储）