Carbon Letters
·
2023
·Vol. 34
·期 1
·343-350
·
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
·
材料科学
✓ 已验证
DOI
高影响因子
Polymer-Plastics Technology and Materials
·
2020
·
IF 0
Shanshan Wang,Qifeng Li,Fanghui Wang
Designed and synthesized a series of imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) (Im-PPO) containing pendant imidazole groups, which were used to supply functional sites for acid–base interaction with the doping phosphoric acid. The imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) membranes obtained by the solution-casting method were doped with phosphoric acid (PA). The PA content, swelling, and tensile strength of the different membranes doped with PA were measured. With the increase of the length of side chains on the imidazole groups, the membrane showed different properties. The proton conductivity at a level of 3.7 × 10−2 S/cm was achieved at 160°C by the MeIm-PPO imidazolium composite membrane.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
Advanced Energy Materials
·
2018
·Vol. 8
·期 32
·1802441
·
IF 21.875
Tianyu Lei,Wei Chen,Yin Hu,Weiqiang Lv,Xiaoxue Lv,Yichao Yan,Jianwen Huang,Yu Jiao,Junwei Chu,Chaoyi Yan,Chunyang Wu,Qiang Li,Weidong He,Jie Xiong
Lithium-sulfur (Li-S) batteries are of considerable research interest for their application potentials in high-density energy storage. However, the practical application of Li-S batteries is severely plagued by polysulfide (PS) dissolution and serious safety concerns caused by flammable sulfur and polymer separators. Herein, a nonflammable multifunctional separator for efficient suppression of PS dissolution and high-temperature performance of Li-S batteries is reported. Polyacrylonitrile (PAN) and ammonium polyphosphate (APP) are electrospun into a multifunctional separator (PAN@APP) for stable and safe Li-S batteries. Owing to the abundant amine groups and phosphate radical in APP, the PAN@APP separator has strong binding interactions with PS, which exerts strong charge repulsion to suppress the transport of negatively charged PS ions and free radicals. Furthermore, refractory APP ensures the stability of the battery at high temperatures. Using the PAN@APP separator, the Li-S battery demonstrates a capacity retention of 83% over 800 cycles. This work provides a robust materials platform for stable and safe Li-S batteries and points to a direction to close the current gap facing the commercialization of high-energy next-generation electrochemical conversion/storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2017
·
IF 13.942
Guodong Zou,Qingrui Zhang,Carlos Fernandez,Gang Huang,Jianyu Huang,Qiuming Peng
Rational design of heterogeneous electrode materials with hierarchical architecture is a potential approach to significantly improve their energy densities. Herein, we report a tailored microwave-assisted synthetic strategy to create heterogeneous hierarchical Ti3SiC2@C-containing Na2Ti7O15 (MAX@C-NTO) composites as potential anode materials for high-performance sodium storage in a wide temperature range from 25 to 80 °C. This composite delivers first reversible capacities of 230 mAh g–1 at 200 mA g–1 and 149 mAh g–1 at 3000 mA g–1 at 25 °C. A high capacity of ∼93 mAh g–1 without any apparent decay even after more than 10 000 cycles is obtained at an ultrahigh current density of 10 000 mA g–1. Moreover, both a high reversible capacity and an ultralong durable stability are achieved below 60 °C for the same composites, wherein a 75.2% capacity retention (∼120 mAh g–1 at 10 000 mA g–1) is achieved after 3000 cycles at 60 °C. To the best of our knowledge, both the sodium storage performances and the temperature tolerances outperform those of all the Ti-based sodium storage materials reported so far. The superior sodium storage performances of the as-synthesized composites are attributed to the heterogeneous core–shell architecture, which not only provides fast kinetics by high pseudocapacitance but also prolongs cycling life by preventing particle agglomeration and facilitates the transportation of electrons and sodium ions by large micro/mesopore structure.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 308
·期 5
·2200559
·
IF 4.402
Lingcheng Meng,Jinling Zhang,Shuang Zhao,Desheng Qi,Pan Xu,Shuoqi Wu,Le Wang,Xigui Yue,Zhenhua Jiang
Polyaryletherketone is a kind of special engineering plastics with excellent comprehensive properties, high strength, good stability, and almost insoluble in any common solvent except concentrated sulfuric acid at room temperature. However, its high processing temperature also hinders its application and development in the foam. Here, a series of polyetheretherketone (PEEK) and diphenyl polyetheretherketone (PEDEK) composite foams are prepared by temperature induced phase separation, using diphenyl sulfone as solvent. The microstructure, thermal and mechanical properties of PEEK and PEDEK foam are compared. Highly porous PEEK and PEDEK foams with densities ranging from 0.13 to 0.25 g cm −3 , with compressive strength ranging from 0.68 to 2.6 MPa, respectively, are produced. Meanwhile, the introduction of diphenyl structure can effectively improve the performance of PEEK foams at high temperature. It is found that PEDEK foam has a higher operating temperature than PEEK, and the compressive strength of 0.24 g cm −3 foam is still ≈1 MPa at 200 °C.
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
High Voltage
·
2022
·Vol. 8
·期 3
·630-639
·
IF 4.967
Guangyu Duan,Fengying Hu,Ruina Zhang,Zuming Hu
Polymer dielectrics with excellent energy storage performance at high temperature are urgently needed in advanced applications, such as hybrid electric vehicles, smart grid and pulsed power sources. Polyetherimide (PEI), which is supposed to be the most promising candidate among polymer dielectric materials, displays a limitation for high-temperature polymer dielectrics owing to the rapidly decreasing discharged energy density ( U d ) and charge-discharge efficiency ( η ). Herein, a novel PEI with cross-linked networks was firstly prepared by utilising 2,4,6-Triaminopyrimidine (TAP) as a cross-linker. The results showed that the breakdown strength of the cross-linked PEI (c-PEI) with 2 wt% TAP increased to 399.4 MV/m, showing an increment of 23.3% in comparison with non-cross-linked PEI. Additionally, owing to the restrained polarisation loss and relaxation loss by cross-linked networks, the dielectric loss of c-PEI dielectric gradually decreased with the increasing content of TAP. Of particular significance was the c-PEI dielectrics exhibiting improved U d and η at high temperature. The maximum U d of c-PEI with 2 wt% TAP was 2.53 J/cm 3 at 150°C, which was 24.8% higher than non-cross-linked PEI (2.11 J/cm 3 at 150°C). This research provides an innovative strategy to achieve novel PEI dielectrics with improved U d and η at high temperature.
研究领域:
材料科学
·
能源存储
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 44
·e53103
·
IF 3.057
Hao Xing,Yanyu Mao,Yang Yang,Chunyan Qu,Dezhi Wang,Xupeng Fan,Liwei Zhao,Dongpeng Zhou,Changwei Liu
In response to the theme of environmental protection and green development in the world in the recent years, waterborne epoxy resin has received more and more attention. Waterborne epoxy resin has lower toxicity, but its low toughness limits the application range of waterborne epoxy resin. Here, we first proposed a method of toughening waterborne epoxy resin with aqueous polyamide salt solution. In this article, a series of waterborne polyamic acid salts is used as modification polymer to improve the high-temperature resistance and other properties of waterborne epoxy resins by copolymerization modification. Waterborne polyamic acid salt is dispersed uniformly in the epoxy resin. After curing, by compared with the pure epoxy resin, a semi-interpenetrating network is formed, the cross-linking density and the high-temperature resistance of the material are increased, and the glass transition temperature increases from 105°C to 116°C. The storage modulus at 300°C increases from 6.15 to 15.76 MPa. Thermogravimetric Analysis results reveal that the corresponding temperatures of 5% and 10% weight loss increase from 403°C and 419°C to 415°C and 435°C, respectively. At the same time, the toughness of the imide chain segment and polar groups lead to the improved adhesion of the epoxy system, the peeling strength increase from 0.51 to 1.24 N cm −1 , and the lap shear strength at high temperature (100°C) increase from 0.58 to 16.97 MPa. The water absorption decreases from 1.51% to 0.66%. The developed waterborne epoxy resin is expected to be used as a high-temperature waterborne epoxy coating in high-temperature coatings and other applications.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huikang Xu,Weijun Chen,Chengyang Wang,Tingting Jia,Dezhi Wang,Gang Li,Daoxiang Zhao,Baojun Cui,Zhen Fan,Xupeng Fan,Haitao Zhang,Tenghai Gan,Hao Xing,Liwei Zhao,Changwei Liu
The demand for sensitive pressure sensors is increasing due to the rapid development of intelligent electronic equipment in high-tech fields such as aerospace and transportation. However, the high-temperature conditions encountered in aerospace applications pose challenges to the performance of flexible sensing materials used in related equipment. In this context, silver nanoparticles (AgNPs)-wrapped polyimide (PI) hybrid aerogels (PI/AgNPs aerogels) with scorpion pectine-like microstructures (SPM) were fabricated by freeze-drying the precursor solution, followed by a thermal imidization reaction and a dipping process with a AgNPs solution. The SPM grew vertically on the layered structure with a height between 20 and 40 μm. These PI/AgNPs provided sufficient structural strength as a support while providing recovery and contact points. The AgNPs were uniformly dispersed on the SPM (with a thickness of 78–120 nm on PI/AgNPs-1). The SPM-interface secondary response structure was used to realize an electrical response in a broad tension (the PI/AgNPs-2 aerogel has changed from −15.63 kPa under 30 % tensile stress to 69.25 kPa under 70 % compression stress). The hybrid aerogels had excellent sensing performance, including good resistance change (89 %), ultra-high sensitivity (6.9 kPa −1 ), the ability to detect different deformations (compression, tension, and bending), and low fatigue after 3000 load-unload cycles. In addition, these aerogels were able to withstand high temperatures up to 250 °C, and they showed good conductivity response consistency at high and room temperatures. These PI/AgNPs aerogels can be used as sensors in extreme conditions such as in aeroengine peripheral electronics for sensing and detecting external loads.
研究领域:
材料科学
·
传感器技术
✓ 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
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2016
·
IF 5.746
Ke Wang,Zhongyun Zhou,Pengfei Zhao,Zeguang Yin,Zhen Su,Ji Sun
A unique gluconic acid treatment coupled with a carbon coating process was used to synthesize Li 4 SiO 4 ceramics (GAC-Li 4 SiO 4 ) with superior performance for high-temperature CO 2 capture. The effects of different synthetic methods, carbonization temperatures, acid sources and acid contents on the performance of the sorbent were studied and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen absorption and thermogravimetric analyses. After the gluconic acid treatment and carbon coating, the GAC-Li 4 SiO 4 had a small crystal size, hollow morphology and enhanced pore features. Significant improvements in CO 2 sorption performance (i.e., low absorption temperature, fast absorption rate, and high capacity) were thus obtained. Moreover, the carbonization temperature, acid content and acid type greatly affected the morphology and chemisorption properties of the Li 4 SiO 4 sorbents. Under the optimized synthetic conditions, the maximum CO 2 absorption capacity was 34.7% after isothermal absorption at 665 °C for 10 min. This sorbent also maintained good cyclic properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jun Cheng,Jun Wang,Xiaozhou Wang,Hao Wang
A novel precursor was synthesized by reacting hafnium chloride with dicyandiamide and dimethylformamide. The precursor was characterized via FT-IR and NMR , as well as TG. Subsequently, the precursor was annealed in Ar over a range of temperatures from 1000 °C to 2000 °C, and the microstructural evolution of the ceramics was investigated by XRD , XPS , and TEM. The results show that the carbothermal reduction of the precursor starts at 1150 °C and the ceramic yields at 1500 °C reach 44.6 wt%. The obtained powders exhibit a uniform distribution and are composed of N-doped HfC and graphite. The N-doped structure postponed the oxidation of the HfC(N) ceramics. The HfC(N) ceramics were first oxidized to yield HfO 2 , carbon, and nitrogen, and then the carbon was oxidized with the evolution of CO 2 . The presented synthesis method is believed to be applicable to the preparation of other high-performance ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Frontiers in Materials
·
2020
·
IF 2.705
Li Xinxi,Liu Long,Li Shumin,Guo Lin,Li Bin,Zhang Guoqing
Spinel lithium manganese oxide (LiMn2O4) based Li-ion battery (LIB) is attractive for hybrid/full electric vehicles because of its abundant resources and easy preparation. However, operation under an elevated temperature could cause severe capacity fading of the spinel cathodes. In this work, 1, 3-propane sultone (PS) is investigated as an electrolyte additive for improving the cyclability of the LiMn2O4/graphite LIB at elevated temperature. The charge and discharge measurement proves that PS can significantly enhance the cyclability of 053048-type LiMn2O4/graphite pouch cell at 60°C. Compared to the cell without additive, the capacity retention of the cell using electrolyte with 5% PS increases from 52 to 71% after 180 cycles. The improved cyclability is attributable to the modification of the solid electrolyte interface (SEI) on both positive and negative sides of the LiMn2O4/graphite cell by PS, which effectively prevents anode and cathode from structural breakdown and inhibits the electrolyte decomposition.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）