Energy Storage Materials
·
2022
·
IF 20.831
Xuewen Hu,Qicheng Zhang,Ning Gong,Xifan Chen,Lan Wang,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
MXenes, a new family of two-dimensional materials, have been recognized as promising candidates for supercapacitors because of their unique chemical and physical properties. It has been proven that the terminal groups on MXenes play a decisive role in the pseudocapacitance . In this study, we report a highly efficient strategy to remove the –F terminal groups of Ti 3 C 2 T x . Our initial purpose was to explore the application of Ti 3 C 2 T x in sodium-ion batteries, whereas we found that almost all the –F terminal groups on Ti 3 C 2 T x could be eliminated by reaction with Na metal at high temperature, and abundant terminal –O was introduced after the subsequent washing step. The mechanism involved is clarified by combining systematical spectra analysis and density functional theory (DFT) calculations. In addition, the modulated Ti 3 C 2 T x MXene shows an extraordinarily high specific capacitance of 521 F·g −1 (at scan rate of 2 mV·s −1 ) or 578 F·g −1 (at a discharge rate of 1 A·g −1 ) in 1 м H 2 SO 4 , and 92% capacity could be retained even after 10000 cycles. This study should provide new insight into the surface chemistry of MXenes and facilitate its applications in a variety of fields.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Yan Qin-Yu,Song Shun-Gang,Zhou Bu-Jie,Hu Jing,Feng Lian-Fang,Gu Xue-Ping,Zhang Cai-Liang
Poly(phenylene oxide) (PPO) exhibits excellent dielectric properties, making it an ideal substrate for high-frequency, high-speed copper-clad laminates. The phenolic hydroxyl group at the end of PPO plays a key role in its reactivity. Accurately quantifying the phenolic hydroxyl content in PPO is essential but challenging. In this study, we proposed a method for measuring the phenolic hydroxyl content of PPO using differential UV absorption spectroscopy. In alkaline solutions, the phenolic hydroxyl in PPO completely ionizes to form phenoxide ions, leading to a significant increase in UV absorbance at approximately 250 and 300 nm. Notably, the differential UV absorbance at approximately 300 nm was directly proportional to the phenolic hydroxyl concentration. Using 2,6-dimethylphenol as a standard, a calibration curve was established to relate the phenolic hydroxyl concentration to differential UV absorbance at approximately 300 nm, providing a precise and straightforward method for phenolic hydroxyl quantification in PPO with distinct advantages over conventional techniques.
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 17
·48617
·
IF 2.188
Bing Yang,Yu Zhou,Hongxiang Chen,Song Zhang,Jingyi Liu
In order to improve the dispersity and stability of nano-SiO 2 aqueous system with high solid content, acrylic acid/allyloxy polyethylene glycol copolymer dispersants with methoxysilicon end groups (KH590-AA x -APEG y ) were synthesized by photopolymerization. After adding KH590-AA x -APEG y into the nano-SiO 2 aqueous system, the viscosity, the curing time, the particle size, and the zeta potential of these systems were respectively measured. The results showed that introducing polyethylene glycol chain into the dispersant was beneficial to better exerting its electrostatic repulsion and steric hindrance effects and further improving the dispersibility of the nano-SiO 2 aqueous system. Moreover, the dispersion stability of SiO 2 nanoparticles in water was closely related to the composition, the molecular weight, and the addition amount of KH590-AA x -APEG y and the solid content. When the molecular weight of KH590-AA x -APEG y was 3200 g mol −1 and its addition amount was 0.1 wt %, the nano-SiO 2 aqueous system with 20 wt % solid content showed the best dispersity and stability. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48617.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Le Li,Han Tao,Bolang Wu,Ge Zhu,Ke Li,Ning Lin
Different from the conventional surface modification strategy, the end reaction based on the active aldehyde groups of cellulose nanocrystal (CNC) provides a targeted modification under the protection of its surface chemistry. With the purpose of promoting its redispersibility in water, the strategy of triazole end-grafting performed on CNC was proposed in this study, exhibiting the significant improvement on the redispersion and stability of nanocrystals in the aqueous suspension attributed to synergistic effect of steric stabilization and electrostatic repulsion. The end-modified CNC was then introduced into a natural rubber (NR) matrix to fabricate the composites with reactive compatibility from a thiol–ene click reaction. Ascribed to the formation of covalent linkage between nanofillers and matrix together with the architecture of the rigid percolating network, the mechanical properties of obtained composites were remarkably advanced. With the introduction of 10 wt % end-modified CNC, the tensile strength, Young’s modulus, and storage modulus of the prepared composite increased by 160, 468, and 1041% in contrast with those of the neat NR material. More importantly, this composite retained a high level of elongation at the break (1575%) similar to that of the raw rubber material attributed to the designed covalent linkage and resultant reactive enhancement of end-modified CNCs to the NR matrix.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2019
·Vol. 44
·期 3
·345-354
·
IF 1.634
Guangpu Zhang,Jinqing Li,Shixiong Sun,Yunjun Luo
Azido-terminated hyperbranched multi-arm copolymer (POGA) with hyperbranched polyether core (PEHO- c ) and linear azido-terminated glycidyl azide polymer arms (GAPA- a ) has been prepared. The structures of the polymers were characterized by FT-IR, NMR, GPC and elemental analysis. The molecular weight of POGA was up to ca 17000 g mol −1 , far higher than that of common plasticizers (200∼1000 g mol −1 ). The enthalpy of formation and high nitrogen content of POGA demonstrated its remarkable energy level, and low impact and friction sensitivities indicated its good safety performance in mechanical stimuli. The results of the kinetic and thermodynamic parameters, calculated from non-isothermal DSC, denoted a fine thermal stability of POGA. Furthermore, the plasticizing effect of POGA, evaluated by plasticizer efficiency and viscosity, was superior to A3 but inferior to Bu-NENA, however, its exudation was much slower than that of small molecular plasticizers, especially Bu-NENA. Moreover, the plasticizing mechanism of POGA as energetic macromolecular plasticizer was established by analyzing its structure and performance characteristics.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Minghong Wu,Xing Liu,Yubin Zhou,Liyun Fu,Juncheng Pan,Bo Cao,Shumei Liu,Jianqing Zhao,Weiqi Xie
In this paper, for the first time, a novel fluorinated anhydride-terminated imide oligomer 6FDA-ODA was prepared with a facile and one-step route, and used as the multifunctional co-curing agent of methylhexahydrophthalic anhydride (MHHPA) for commercial bisphenol A epoxy resin (DGEBA). For the epoxy thermoset containing 30 phr of 6FDA-ODA, 6FDA-ODA-30 exhibited a high glass transition temperature ( T g ) of 151.6 ℃ and an initial degradation temperature of 382.5 ℃, and also showed a 211%, 134% and 11.8% increase in impact strength (20.5 kJ/m 2 vs. 6.6 kJ/m 2 ), char yield (in N 2 ) (15.2% vs. 6.5%) and tensile strength (71.3 MPa vs. 63.8 MPa), respectively, compared with the pure epoxy thermoset (6FDA-ODA-0). Moreover, 6FDA-ODA-30 possessed a low dielectric constant of 3.23 at 1 MHz and high water resistance (water absorption = 0.52%) due to the introduction of bulky trifluoromethyl (-CF 3 ) and imide moieties. This paper provides a facile design strategy and new opportunity for synthesizing anhydride-terminated imide oligomer, possessing high potential for the utilization in advanced matrix materials for microelectronic and aerospace industries.
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
POLYMER
·
2025
·
IF 4.5
Jinqi Ye,Nasha Zeng,Lili Wang,Keying Zheng,Junyi Lu,Minghua Wu
Disperse dyes wash-free inkjet-dyeing is one of the important research and development directions to achieve clean dyeing of polyester fabrics. Wash-free binders are needed to be designed with a special molecular structure to achieve good colour yield and fixation during dyeing. Specifically, isophorone diisocyanate and polypropylene glycol were used as the monomers of the hard and soft chain segments of the polymer, respectively, and KH-560 as the capping agent, to prepare a series of end-group cross-linked organosilicon modified waterborne polyurethane (SWPU). It was applied as wash-free binder for the digital inkjet-dyed polyester fabrics. The results showed that, for 2 wt% KH-560 and 40 wt% hard chain segments, the SWPU film had good water resistance, mechanical properties, and adhesion properties, and the best dispersed dye directional effect. With the addition of SWPU in the dye ink of 8 wt%, the front K/S value of the SWPU wash-free digital inkjet-dyes fabric reached 16.86, and the dry/wet rubbing fastness achieved grades 4–5 and 3–4, respectively. Compared with the pure dye inkjet-dyed fabric, its front K/S value increased by 23.9 %, and its dry/wet rubbing fastness improved by grades 1 and 0.5, respectively.
研究领域:
高分子科学
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纺织化学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 17
·10567-10580
·
IF 2.599
Tong Zaizai,Zhuo Wangqian,Zhou Jie,Huang Runsheng,Jiang Guohua
Noncovalent functionalization was used to modify the graphene nanosheets via π – π stacking of pyrene-terminated molecule (Py-LC), resulting in an intercalated layer structure incorporated with about 45 wt% of Py-LC. The organically modified graphene (Py-LC-rGO) has a better dispersion in the PET matrix compared with that without modification. Consequently, it remarkably accelerates the crystallization of PET. Moreover, the nucleation ability of Py-LC-rGO is even stronger than that of commercial nucleation agent, sodium benzoate, leading to a thicker lamellar crystals and denser stacking of lamellae. Accordingly, the impact toughness of such a composite is improved to be nine times as that of neat PET, which can be a promising candidate as nanofiller for PET.
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
RSC Advances
·
2015
·Vol. 5
·期 44
·35282-35290
·
IF 3.84
Si Chen,Guodong Tang,Bozhen Wu,Meng Ma,Xu Wang
The key effect of the self-assembly mechanism of dendritic gelators is researched by a comprehensive investigation of the gelation behavior of L-lysine dendritic gelators with different structures of three generations in 20 different solvents. The solvents investigation, 1H NMR, tube inversion method, DSC, rheology, FTIR and rheological measurements show that the reported dendritic gelators self-assemble through the main driving force of hydrogen bonds and the second driving force of π–π stackings. So the key effect of the self-assembling mechanism is that these factors can influence the driving force of the self-assembly process. This is the reason that L-lysine dendritic gelators tend to gelate in solvents with low α and β parameter values, which have less influence on the formation of hydrogen bonds between the gelators. Higher generations provide a much greater hydrogen bond density in the gelators, which makes them have a higher gelation ability. The benzyl terminal groups provide the second driving force of π–π stacking, making the Bzl-Gly-Lys gelators have much stronger gelation ability. This research reports a comprehensive insight into the precise ways in which the solubility parameters of the solvents, the gelator generation and the terminal group effects can influence the self-assembly and gelation of dendritic gelators. Gaining this type of fundamental understanding is essential if the key effect of this important class of self-assembling soft materials is to be truly understood.
研究领域:
材料科学
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化学
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纳米技术
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物理化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2013
·
IF 2.206
Yijian Wu,Lei Gui,Huan Wang,Baoqing Shentu,Zhixue Weng
A novel and convenient synthetic method for the preparation of α,ω-bis(2,6-dimethylphenol)-poly(2,6-dimethyl-1,4-phenylene oxide) (PPO-2OH) oligomer in water is presented. It is based on the oxidative copolymerization of 2,6-dimethylphenol (DMP) and aromatic diols in the presence of Cu-ethylene diamine tetraacetic acid catalyst in water. It was found that the mole fraction of PPO-2OH in the product was affected by species of aromatic diols and mole ratio of DMP to aromatic diols. Species and concentration of surfactants were demonstrated to be significant factors that would influence molecular weight (Mn) and yield of PPO-2OH. The synthesized PPO-2OH was end-group modified with methacryloylchloride (MAC) to obtain dimethacryloyl chloride telechelic PPO (PPO-2MAC). The relationship between glass transition temperature (Tg) and Mn of PPO-2OH is in good agreement with the Flory–Fox equation. Thermal polymerized low-molecular-weight PPO-2MAC has a constant Tg at about 208 °C.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 16
·
IF 1.64
Xiu Qiang,Fang Chen,Xiao-Yan Ma,Xian-Bing Hou
Star-shaped polyhedral oligomeric silsesquioxane (POSS)–methacrylate hybrid copolymers with phenyl–triazole as terminal groups had been designed and synthesized via sequential atom transfer radical polymerization (ATRP), azidation, and phenylacetylene-terminated procedures, and the hybrid copolymers here could be denoted as POSS–(PXMA-Pytl) 8 , where X can be M, B, L, and S, represented four different methacrylate monomers, such as methacrylate (MMA), butyl methacrylate (BMA), lauryl methacrylate (LMA), and stearyl methacrylate (SMA), respectively. Thermal gravimetric analysis (TGA) and in situ Fourier transform infrared spectroscopy (FTIR) were applied for studying the thermal stability and degradation mechanism, and it was found that all of the POSS–(PXMA-Cl) 8 and POSS–(PXMA-Pytl) 8 copolymers exhibited excellent thermal stabilities, which had great potential in heat-resistant material application. Different tendencies of decomposition temperatures at 5% and 10% weight loss ( T 5 and T 10 ) dependent on the side-chain length and terminal group species were investigated respectively. The longer alkyl side chains of the monomers, the lower thermal stabilities, and enhanced T 5 and T 10 were also shown with the introduction of phenyl–triazole groups instead of chlorine groups. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40652.
研究领域:
聚合物化学
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材料科学
·
热分析
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 42
·e54551
·
IF 3
Siyuan Lu,Gang Wu,Fangfang Niu,Yangdong Liu,Xingsheng Liu,Wan Xu,Zhenbin Chen
Increasing social awareness concerning the design of excellent performance toughening agents to curb the adverse effects of insufficient toughness on the wide range of applications of epoxy resin (EP). Herein, a small amount of sorbitol was doped into carbocyclic inositol as a core monomer, and bisphenol-A and epichlorohydrin were used to produce epoxide-terminated hyperbranched polyether by one-pot preparation method. After that, the prepared polymer was used as modifier to improve the toughness and strength of petroleum-based EPs. Results demonstrated that after adding the homemade epoxy-terminated hyperbranched polyether (EHBPE) to the EP, the polyether prepared with the ratio of sorbitol and inositol displayed significant advantages compared with the polyether with monomers using only sorbitol and inositol, respectively. In particular, the impact, and tensile strengths of EHBPE-IS/EP cured sample with EHBPE-IS loading at 20% were increased by 197.5%, 139.6%, respectively, compared with those of neat EP. In brief, EHBPE-IS, a member of the family of EHBPEs, provided a facile method for the preparation of bifunctional modifier for tough and strong EP with promising industrial applications.
研究领域:
材料科学
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聚合物化学
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复合材料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）