POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 8
·953-959
·
IF 1.757
Shuting Wang,Lan Cen,Qihao Wu
Maleated glycidyl 3-pentadecenyl phenyl ether with styrene (MGS) was synthesized from glycidyl 3-pentadecenyl phenyl ether (GPPE), maleic anhydride (MAH) and styrene (St) in the presence of AIBN initiator at 80°C, and then the resultant MGS was applied as a compatibilizer to prepare SBR/silica composites. Meanwhile, the commercial compatibilizer bis-(triethoxysilylpropyl) tetrasulfide (named Si69) added into composite was also prepared for comparison purpose. The synthetic MGS structure was characterized by GPC and FTIR, and SBR/silica compounds with different compatibilizer were analyzed using RPA, DMA and so on. The results showed that M̄n and M̄w of MGS were 19,538 g/mol and 23,790 g/mol, respectively. The curing time of compounds with MGS increased, whereas the maximum and minimum torques decreased. The addition of MGS decreased Payne effect of SBR/silica compounds, which implied an improvement of silica dispersion in the compounds. Bound rubber content of compound with MGS was about 1.7 times higher than the absence and 1.5 times higher than that with Si69. The tensile strength of the composites was improved by increasing compatibilizer loading, and the optimum value was observed at 6 phr of MGS. Meanwhile the use of MGS can improve the anti-aging property of composite. According to DMA, the tanδ value at 0°C of composite with MGS was higher than composite without compatibilizer suggesting that MGS can improve the wet skid resistance of composite. The SEM analysis revealed that introduction of MGS enhanced the compatibility between SBR and silica. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
高分子化学
·
橡胶复合材料
·
材料界面科学
·
功能高分子
·
聚合物改性
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 11
·5546-5554
·
IF 3.3
Wenwen Yang,Shan-Shan Xu,Yawen Niu,Yanhui Zhang,Jian-Feng Li,Juan Xu
As a member of the ternary sulfides, CdIn2S4 is a visible light responded catalyst with a band gap of 2.2–2.6 eV, which is suitable for solar spectrum. In this study, a simple two-step solvothermal method was used to construct Ni12P5/In(OH)3/CdIn2S4 composite catalysts with type-II and Z-scheme heterojunctions, and there was a synergy between the two heterojunctions. The Ni12P5/In(OH)3/CdIn2S4 composite catalyst formed a donor-mediator-acceptor system for photogenerated electrons, which greatly improved the separation efficiency of the photogenerated carriers. Moreover, the highest hydrogen production activity achieved by the Ni12P5/In(OH)3/CdIn2S4 composites was 5.75 mmol g−1 h−1, which was 21 times the original CdIn2S4.
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 7
·2107-2114
·
IF 7
Qin Wang,Jinxuan Ren,Dan Wang,Liling Cao,Xuehua Dong,Ling Huang,Daojiang Gao,Guohong Zou
Two fluorine antimony nitrates named (NH4)3SbF3(NO3)3 and (NH4)3SbF4(NO3)2 have been successfully synthesized by a low temperature molten salt method. Although these two title compounds possess NO3− groups and similar Sb-polyhedra, they exhibit completely different macroscopic centricities, (NH4)3SbF3(NO3)3 being noncentrosymmetric while (NH4)3SbF4(NO3)2 being centrosymmetric, which is induced by the discrepant coordination environments of Sb3+. Interestingly, the noncentrosymmetric (NH4)3SbF3(NO3)3 exhibits a strong second harmonic generation response (3.3 × KDP), a large birefringence (0.098@546 nm) and a large band gap (3.77 eV), indicating its potential as a UV nonlinear optical material. Detailed structure–property analysis confirms that the superior optical property is due to the synergistic effect of the planar π-conjugated NO3− groups and the stereochemically active lone pair containing Sb3+ cations.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 15
·4708-4716
·
IF 4
Zhaoyang Wang,Jiaxuan Han,Dong Wang,Lingyang Liu,Wenjing Shi,Fangyu Xiong,Haizheng Tao
Na3V2(PO4)3 (NVP) is regarded as one of the most promising cathode materials for sodium-ion batteries (SIBs). However, it suffers from a dense bulk structure and low intrinsic electronic conductivity, which lead to limited electrochemical performances. Herein, we propose a surfactant-assisted molding strategy to regulate the pore-forming process in NVP/C composite cathode materials. More precisely, the forming process of the pores in NVP could be easily controlled by utilizing the huge difference in critical micelle concentration of a surfactant (cetyltrimethylammonium bromide, CTAB) in water and ethanol. By reasonably modulating the ratio of water and ethanol in the solution, the as-synthesized NVP/C sample exhibited a three-dimensional interconnected structure with hierarchical micro/meso/macro-pores. Benefiting from these hierarchical porous structures in NVP/C, the structural stability, contact surface with the electrolyte, and electronic/ionic conductivity were improved simultaneously; whereby the optimized porous NVP/C sample exhibited an excellent high-rate performance (61.3 mA h g−1 at 10 C) and superior cycling stability (90.2% capacity retention after 500 cycles at 10 C).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhiming Sun,Yuhang Gao,Chaogang Ban,Jiazhi Meng,Jinshu Wang,Kaiwen Wang,Liyong Gan
Oxygen vacancy (Vo) engineering is a powerful tool to improve semiconductor metal oxide-based surface-enhanced Raman scattering (SERS) activity due to the enriched surface states of substrates. However, the current energy-consuming high-temperature hydrogen reduction methods of introducing Vo and the poor sensitivity impede practical applications of semiconductor SERS. In this work, a facile solvothermal method was developed to prepare ultrafine WO3–x nanorods (∼3 nm width) for high-performance SERS substrates. The lowest detection limit of the rhodamine 6G (R6G) molecule on the Vo substrate can be as low as 10–10 mol/L and exceeds that of unmodified WO3 by more than two orders of magnitude. Experimental and calculated results suggest that the Vo-induced localized surface plasmon resonance (LSPR), diverse vibronic coupling, and enhanced charge transfer synergistically account for this outstanding activity. These findings can provide insights into the rational design of oxygen vacancy-tailored semiconductor SERS substrates.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 23
·5233
·
IF 4.967
Chunhua Lou,Siyu Jiang,Yongli Zhou,Xiaohua Gu,Yong Zhang,Xianzhi Kong
A modified corn straw (CS)/epoxy resin (EP) composite was prepared using bisphenol A EP (i.e., E-51) as matrix, 2-methylimidazole as curing agent, and CS modified by 3-glycidyl ether oxypropyl trimethoxysilane (KHCS) as filler. Its chemical structure was characterized by Fourier transform infrared spectroscopy (FTIR). The dynamic thermodynamic properties, mechanical properties, flame retardant property, and fracture morphology were studied using dynamic mechanical analysis (DMA), a universal testing machine, a micro combustion calorimeter, and a scanning electron microscope (SEM), respectively. The effects of different contents of KHCS on various properties were discussed. The experimental result showed that the CS was bonded toKH560 by a covalent bond. The impact strength, tensile strength, and flexural strength of the composites were all improved compared with those of pure EP. When the content of KHCS was 15 wt%, the maximum impact strength of the composites was 3.31 kJ/m2, which was 1.43 times that of the pure EP. The p HRR and THR of MCSEC-20 were 512.44 W/g and 25.03 kJ/g, respectively, which were 40.71% and 27.76% lower than those of pure EP, when the content of KHCS was 20 wt%. Moreover, the mechanism of the curing composites was investigated.Keywords:epoxy resin;corn straw;composites;preparation;curing mechanism
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 3
·1-10
·
IF 5.7
Fan Xiaoyu,Zhang Shuai,Li Rui,Chen Yafei,Jiang Shuhan,Liu Tao,Shao Xiaodong,Wang Shuhao,Yue Qiaoli
Novel and portable cotton swab–based fluorometry was constructed for the first time for 3-aminosalicylic acid (3-ASA) and 5-aminosalicylic acid (5-ASA) detection. It was carried out by fluorescence enhancement on silver (Ag)–doped black phosphorus quantum dots (Ag@BPQD). Ag@BPQD were prepared from AgNO 3 and bulk black phosphorus in N, N-dimethylformamide (DMF) solution by solvothermal decomposition after mechanical exfoliation. Ag@BPQD show blue fluorescence with a quantum yield (QY) of 2.43%. In the presence of Ag@BPQD, 3-ASA exhibited bright blue fluorescence (λ ex = 328 nm, λ em = 448 nm). The fluorescence of 5-ASA was also enhanced significantly and exhibited bright green emission (λ ex = 328 nm, λ em = 484 nm). The linear range of 3-ASA is 0–90 μM with a detection limit (LOD) of 0.10 μM, relative standard deviation (RSD) ≤ 2.04%, and a recovery range of 98.0–104.3%. The linear range of 5-ASA is 0–120 μM with a LOD of 0.12 μM, RSD ≤ 1.34%, and a recovery range of 98.0–101.3%. When 3-ASA and 5-ASA were mixed in different ratios, the fluorescence showed different colors. The possible mechanism of the interaction between 3-ASA (or 5-ASA) and Ag@BPQD may be ascribed to the generation of excited-state intramolecular proton transfer. To realize convenient detection of 3-ASA and 5-ASA, a Ag@BPQD portable sensing method using cotton swabs were built. The proposed approach provides the detection of 3-ASA and 5-ASA in environmental and biological samples with high efficiency, accuracy and portability. Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·241-252
·
IF 3.134
Xing Qianqian,Zhao Jiancheng,Zhu Yulei,Hou Xianglin,Wang Yingxiong
5-Chloro-2-pentanone (5C2P) and its derivatives are widely utilized in the pharmaceutical and agrochemical industry. A new catalytic approach was proposed to convert 3-acetyl-1-propanol to 5C2P using bis(trichloromethyl)carbonate (triphosgene, BTC) as the efficient chlorine source. Various qualitative and quantitative nuclear magnetic resonance techniques ( 1 H, 13 C NMR), especially 1D selective gradient total correlation spectroscopy (Sel-TOCSY) and 2D heteronuclear single quantum correlation ( 1 H- 13 C HSQC) were used in the process. The reaction conditions, such as temperature, time, mole ratio, solvent as well as initiator were optimized. Experiment results showed that the yield of 5C2P reached a maximum of 97.93% in 1,2-dichloroethane at 80 °C after 2 h under the initiation of N,N-dimethylacetamide, and the optimal molar ratio of 3-acetyl-1-propanol to BTC was 1:0.4. The reaction mechanism was proposed and confirmed accordingly. Interestingly, an intermediate product of 1-(dimethylamino)ethyl carbonochloridate was observed, and its chemical structure was characterized by both Sel-TOCSY and 1 H- 13 C HSQC. This study enriched the catalytic reaction ways for the preparation of 5C2P.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 1
·248
·
IF 5
Yao Lu,Xuna Jin,Xiang Li,Minpeng Liu,Baolei Liu,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Yucheng Xu
Superparamagnetic Fe3O4particles have been synthesized by solvothermal method, and a layer of dense silica sol polymer is coated on the surface prepared by sol-gel technique; then La(OH)3covered the surface of silica sol polymer in an irregular shape by controlled in situ growth technology. These magnetic materials are characterized by TEM, FT-IR, XRD, SEM, EDS and VSM; the results show that La(OH)3nanoparticles have successfully modified on Fe3O4surface. The prepared Fe3O4@La(OH)3inorganic polymer has been used as adsorbent to remove phosphate efficiently. The effects of solution pH, adsorbent dosage and co-existing ions on phosphate removal are investigated. Moreover, the adsorption kinetic equation and isothermal model are used to describe the adsorption performance of Fe3O4@La(OH)3. It was observed that Fe3O4@La(OH)3exhibits a fast equilibrium time of 20 min, high phosphate removal rate (>95.7%), high sorption capacity of 63.72 mgP/g, excellent selectivity for phosphate in the presence of competing ions, under the conditions of phosphate concentration 30 mgP/L, pH = 7, adsorbent dose 0.6 g/L and room temperature. The phosphate adsorption process by Fe3O4@La(OH)3is best described by the pseudo-second-order equation and Langmuir isotherm model. Furthermore, the real samples and reusability experiment indicate that Fe3O4@La(OH)3could be regenerated after desorption, and 92.78% phosphate removing remained after five cycles. Therefore, La(OH)3nanoparticles deposited on the surface of monodisperse Fe3O4microspheres have been synthesized for the first time by a controlled in-situ growth method. Experiments have proved that Fe3O4@La(OH)3particles with fast separability, large adsorption capacity and easy reusability can be used as a promising material in the treatment of phosphate wastewater or organic pollutants containing phosphoric acid functional group.Keywords:superparamagnetic;Fe3O4@La(OH)3inorganic polymer;phosphate adsorption
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Yongchun Zhou,Da Bao,Shengnan Sun,Chen Cheng,Sen Zhang,Minlin Qing,Miao Zhao,Jing Guo
Chitosan grafting coumarin-3-carboxylic acid (CS-g-CCA) fiber with fluorescent function and enhanced tensile strength was successfully prepared by in-situ wet-spinning. FTIR and NMR results demonstrate that CCA is successfully grafted onto the CS molecule chains. As the grafting rate increases from 4.2 to 15.8 %, the spinning solution viscosity increases from 22 to 54 Pa·s. SEM observations show that the CS and CS-g-CCA fiber surfaces and cross-sections exhibit homogeneity and smoothness. Likewise, as the drawing ratio increases from 1.0 to 1.4, 2D WAXS patterns illustrate the molecular chain oriented significantly along the drawing direction. The CS-g-CCA fiber (the grafting rate of 15.8 %) exhibits a maximum breaking strength of 1.06 cn/dtex, increasing by 20 % more than the CS fiber. Meanwhile, it has a peak fluorescence intensity of around 480 nm. In addition, the continuous preparation process simplifies the technological route and improves the preparation efficiency of CS-g-CCA fiber. As-prepared CS-g-CCA fiber with enhanced tensile strength and elevated fluorescence efficiency lays the foundation for potential application in fluorescent probes , anti-counterfeiting, and biomedicine fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Rui Chen,Bao Dongmei,Jiaye Jiang,Chuanbo Sun,Han Chen,Min Zhang
Two effective flame retardant additives hsalaminopyridine phosphaphenanthrene (HAD) and methoaminopyridine phosphaphenanthrene (MAD) were respectively prepared with DOPO, aminopyridine, salicylaldehyde and 3-Methoxysalicylaldehyde. Subsequently, HAD and MAD was added into epoxy resin (EP) respectively, and flame retardancy of EP/HAD and EP/MAD thermosets were dramatically enhanced. The result of cone calorimeter (CC) test revealed that both HAD and MAD showed perfect smoke suppression performance. In respect of transmittance and mechanical properties, there was a huge difference between HAD and MAD. The introduction of HAD dramatically harmed transmittance and mechanical properties of EP, while, EP/10%MAD was transparent and nearly possessed the same mechanical properties with pure EP.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Hao Yang,Yi Liu,Hidetoshi Saitoh,Hao Chen,Hua Li
Biofouling is a stepwise accumulation process involving participation of various molecules and marine organisms. To tackle this complex threat, development of efficient long-term antifouling coatings yet keeps elusive. Here we report a newly constructed coating with both antifouling activity and low surface energy. The special surface structure formed by silica spheres and fluorosilanes offers the coating superhydrophobicity. Capsaicin-mimicking N-(4-hydroxy-3-methoxy-benzyl)-acrylamide (HMBA) powder is synthesized via the Friedel-Crafts reaction and is used as the antifoulant additives in the coating. By the synergistic effect of surface superhydrophobicity and the dispersed antifoulant, the multilayered HMBA-silica coating effectively inhibits the adhesion of alginate, bovine serum albumin and Chlorella , their adhesion rate on the HS-3 coating is 11.9 %, 8.7 % and 3.3 % respectively. The HS-3 coating kills 96.6 % gram-negative bacteria E. coli and 99.9 % gram-positive bacteria S. aureus. Furthermore, the HMBA-silica coating significantly mitigates by its superhydrophobicity the corrosion of artificial seawater, its corrosion current density has decreased by 4 orders of magnitude compared to bare 316 L plate. In a 90 days real seawater immersion experiment, the coating shows excellent anti-fouling and anti-corrosion properties. The fabrication route of the HMBA-silica coating using the synthesized broad-spectrum antifoulant HMBA and hydrophobic silica would give insight into developing new antifouling materials for marine applications.
✓ 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）