THERMOCHIMICA ACTA
·
2022
·
IF 3.378
Yiqinq Xia,Linze Liu,Lian Wang,Rui Shi,Shuai Yan,Xingyu Zhao,Yuping Sheng,Zhi Wang
In this paper, a novel 4-allyl-substituted 1,3-benzoxazine (P-a-[4]ally) was successfully synthesized based on the allylation reaction of aldimines. The chemical structures of intermediates (P-1 and P-2) and P-a-[4]ally were characterized by NMR spectra, and Fourier transform infrared (FT-IR) spectra. The polymerization and curing kinetics were studied by DSC and in-situ FT-IR, and the charge densities of atoms were calculated by Materials Studio. The activation energy of the curing reaction was 108.3 kJ·mol −1 by the Kissinger-Akahira-Sunose method and 111.0 kJ·mol −1 by the Ozawa method. Thermomechanical analysis (TMA), thermogravimetric analysis (TGA), and an Agilent impedance analyzer were used to investigate the thermal and dielectric properties of poly-benzoxazine (P(P-a-[4]ally)). The results revealed that the glass transition temperature ( T g ) of P(P-a-[4]ally) was 154 °C, the temperature at 5% weight loss ( T d,5% ) was 329 °C, the char yield was 21.2% at 800 °C under N 2 , and the dielectric constant was 3.33 at 1 MHz.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yiyang Cui,Kai Zheng,Ruoqing Sun,Zhiwei Yuan,Dengfeng Guo,Juan Xu,Xiaofei Yu,Jian Zang,Jianyu Cao
Aqueous phenazine redox flow batteries hold great potential in large-scale energy storage. The chemical/electrochemical properties of phenazine compounds are greatly influenced by their functional groups and electrode catalytic materials. In this study, we present a facile synthesis of the multi-substituted phenazine derivative containing hydroxyl, methyl and carboxyl groups, namely, 7(8)-hydroxy-8,9(6,7)-dimethylphenazine-2-carboxylic acid (HDMPC), which serves as an anolyte material and exhibit sufficient negative redox potential, quasi-reversible redox kinetics, and high aqueous solubility in LiOH aqueous electrolyte with moderate alkalinity. Pairing with lithium ferrocyanide catholyte in 1 M LiOH (pH∼12.3), with the promotion of a carbon-supported CuO electrocatalyst, the HDMPC anolyte delivers a high open circuit voltage of ∼1.16 V, average energy efficiency of 80.23 % and a low temporal fade rate of ∼0.0086 % per cycle (equivalent to ∼0.38 % per day) for over 200 cycles at 20 mA cm −2 . The post-analysis further reveals that tautomerization of the charged HDMPC rather than crossover, is responsible for most of the fade of cycling capacity during electrochemical cycling.
研究领域:
能源材料化学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Hao Liu,Baomin Fan,Zining Liu,Xiaoqi Zhao,Biao Yang,Xingwen Zheng,Hua Hao
Polyaniline (PANI), poly( N -methylaniline) (PNMA) and poly( N- formylanilide) (PNFA) coatings were fabricated over mild steel via chronoamperometric strategy in oxalate electrolyte. Scanning electron microscope (SEM), attenuated total reflection infrared spectroscopy (ATR-IR) and X-ray photoelectron spectroscopy (XPS) evidenced the polymerization of monomers . Anticorrosive effects of PANI, PNMA and PNFA coatings for steel substrate were evaluated during long-term immersion in 3.5% NaCl solution by potentiodynamic polarization , electrochemical impedance spectroscopy (EIS) and frequency modulation (EFM). Morphological variation for coated specimens before and after immersion in NaCl solution was also monitored by SEM and atomic force microscope (AFM). Differentiated protection capability were observed for three coatings following the sequence of PNFA > PNMA > PANI. Through electrochemical and interfacial analyses, electroactivity and physical barrier were ascertained as the critical factors, especially the former one, in the long-term protection capacity. Electroactivity was distinguished by the elevated apparent current density from non-destructive EFM measurements. Furthermore, electron-donation and -withdrawal effects of N -substituents played an essential role in coating electroactivity. In detail, N -substituents improved the anodic protection and physical barrier of PNMA and PNFA coatings. Particularly, formyl with electron-withdrawal effect reinforced the anodic protection and thus the superior the anticorrosion efficiency of PNFA for underlying steel.
研究领域:
材料科学
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腐蚀与防护
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电化学
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产品关联
DOI
高影响因子
POLYMER JOURNAL
·
2023
·Vol. 55
·期 3
·203-211
·
IF 2.8
Shi Zhichun,Wen Jiaxiang,Zhao Yingnan,Wang Jianjun,Li Jun,Zhao Ming,Teraguchi Masahiro,Aoki Toshiki,Kaneko Takashi
A novel substituted phenylacetylene with a pendant betulin derivative group was designed and synthesized successfully, and the chemical structure of the monomer was confirmed by nuclear magnetic resonance spectroscopy (NMR, 1 H, 13 C), high-resolution mass spectrometry (HRMS) and Fourier transform infrared spectroscopy (FTIR). The obtained monomer was further polymerized in an achiral [Rh(nbd)Cl] 2 /triethylamine (TEA) catalytic system, and the resulting polymer exhibited a strong Cotton effect at the main-chain absorption regions in the circular dichroism (CD) spectra. This one-handed helical backbone was induced by the chiral source on the side chain and maintained by the rigid betulin derivative pendant flats. Furthermore, the rigid betulin derivatives also contributed to the porous morphology and perfect thermal stability of the polymer. This study will provide a new method for preparing porous chiral polymers as efficient separation materials to solve practical issues.
研究领域:
材料化学
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有机合成
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高分子科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Feng Wang,Jun Peng,Renfeng Dong,Xueyi Chang,Biye Ren,Zhen Tong
Hydrophobically modified ethoxylated urethanes (HEURs) are an important class of telechelic associative polymers with various industrial applications, in which careful control of the rheology of the solution is required. We report the synthesis of three novel HEUR polymers end-functionalized by dendritic di-substituted benzene alcohol ( HEUR-2Cn , where n is the length of hydrophobic tails) and their rheological properties in aqueous solutions and latex. The concentrated solutions of these HEURs show interesting aggregation and viscoelastic properties dependent of their hydrophobe length: a viscoelastic liquid for HEUR-2C8 , and elastic gels for both HEUR-2C12 and HEUR-2C16 due to their different relaxation behavior. Interestingly, the concentrated solutions of HEUR-2C16 form the strongest transient network with the largest number density of active micellar junctions and slowest relaxation because of its longest hydrophobe. Furthermore, these HEUR polymers have highly efficient thickening performance in latex compared with a conventional HEUR-C16 with −C 16 H 33 end group, because the dendritic two-tail hydrophobes can form more stable absorption on the surface of the latex through bridging between the latex particles than a single hydrophobe. This work opens a new perspective for highly efficient thickeners and also provides new insights into the potential of these HEUR polymers in waterborne coating, cosmetics, dyestuff, medicines and so on.
研究领域:
材料科学
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化学工程
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2025
·
IF 3.6
Shuaikang Zhou,Siyi Qin,Xifang Zhang,Ying Song,Yuanfei Zhang
A Pd-catalyzed protocol that provides efficient access to acyclic 1,2-dioxygenated dienes has been established. The installation of the bifunctional carbonate electrofuge to the diene cores enabled such dienes to undergo a regioselective decarboxylative Diels–Alder cycloaddition/aromatization reaction, affording diverse synthetic challenging multisubstituted phenols with ease.
研究领域:
有机化学
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催化
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合成化学
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材料科学
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DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 6
·1008-1011
·
IF 1.071
Cao Yangyang,Cai Zengfei,Zhang Wenliang,Du Xiaohua
In this paper, a series of new β -methoxyacrylate derivatives containing a substituted phenylpyridine moiety was synthesized and bioassayed. The structures of all compounds were confirmed by nuclear magnetic re-sonance(NMR) and high-resolution mass spectrometry(HRMS). Preliminary bioassays demonstrated that compound 8 d showed more than 95% inhibition against Brassica juncea and Chenopodium serotinum at 37.5 g a.i./10 4 m 2 , when compared with the positive control halauxifen-methyl at 150 g a.i./10 4 m 2 . The present work demonstrated that compound 8 d exhibited the more promising herbicidal activity and may serve as a new herbicidal agent for herbicide.
研究领域:
植物学
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农药化学
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药理学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Mingzhu Yang,Binglei Song,Delun Du,Xiaomei Pei,Zhenggang Cui
The aqueous solubility of surfactants is an important physicochemical property for their applications, and is expected to be improved by altering the molecular structures. Herein, a series of carboxylate surfactants with α-substituted phenoxy group, namely, sodium α-phenoxy alkyl carboxylates (C n -ph-Na, n = 12, 14, 16, 18, 20), were synthesized. Their solution and emulsion behaviors were investigated by surface tension, fluorescence probe method, confocal laser scanning microscopy (CLSM) and X-ray diffraction (XRD). Compared with conventional sodium carboxylate surfactants (C n Na), C n -ph-Na surfactants show extremely high water solubility of 1250, 1100, 800, 670 and 100 mmol·L − 1 for n = 12, 14, 16, 18 and 20, respectively, at 25 °C. The reason for this difference is the presence of the phenoxy group, which leads to the weak cohesive forces between the alkyl tails in the solid state. The high solubility of C n -ph-Na makes it possible to investigate Pickering emulsions stabilized with alumina (Al 2 O 3 ) nanoparticles hydrophobized by C n -ph-Na in situ. Both C 12 -ph-Na and C 14 -ph-Na can induce double phase inversion of the emulsions with increasing surfactant concentrations. The present work demonstrates the feasibility of adding hydrophobic groups to promote the water solubility of surfactants, providing a new approach for the molecular design and extending application of surfactants.
研究领域:
化学
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材料科学
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界面科学
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产品关联
DOI
高影响因子
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
·
2016
·
IF 0.669
Xing Juan Chen,Guang Lei Yang,Xiao Dong Xu,Jin Jin Sheng,Jun Shen,Hong Xing Dong
Five β-cyclodextrin (β-CD) derivatives bearing substituted phenylcarbamate/3-(triethoxysilyl)propylcarbamate groups at the 2-, 3-, and 6-positions of glucose unit and another five derivatives containing benzoate at the 2-position and substituted phenylcarbamate/3-(triethoxysilyl)propylcarbamate groups at the 3- and 6-positions were synthesized using the regioselective esterification method. The obtained β-CD derivatives were efficiently immobilized onto the silica gel through the intermolecular polycondensation of a small amount of the triethoxysilyl groups, which were used as the chiral stationary phases (CSPs) for high-performance liquid chromatography (HPLC). The chiral separation properties of these CSPs were evaluated under the normal-phase HPLC. The effects of solvent polarity and the side chain structures of β-CD derivatives on the chiral recognition ability of the immobilized CSPs were investigated. Among these β-CD derivative CSPs, 2,3,6-tris(3,5-dichlorophenylcarbamate)-β-CD CSP showed a relatively high chiral recognition ability for the studied racemates. The regioselective esterification at the 2-position of glucose unit in the β-CD decreased the chiral recognition ability at the same conditions. For some racemates, the β-CD derivative CSPs showed chiral recognition abilities comparable or better to some chemical bonded β-CD derivative CSPs and 3,5-dichloro- and 3,5-dimethylphenylcarbamates of cellulose and amylose CSPs.
研究领域:
分析化学
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药物化学
·
色谱技术
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2016
·
IF 2.857
Jing-Bo Liu,Yu-Xin Li,Xiu-Lan Zhang,Xue-Wen Hua,Chang-Chun Wu,Wei Wei,Ying-Ying Wan,Dan-Dan Cheng,Li-Xia Xiong,Na Yang,Hai-Bin Song,Zheng-Ming Li
To discover potent insecticides targeting ryanodine receptors (RyRs), a series of novel anthranilic diamides analogues (12a–12u) containing N-substituted phenylpyrazole were designed and synthesized. These compounds were characterized by 1H NMR, 13C NMR, and HRMS, and the structure of compound 12u was confirmed by X-ray diffraction. Their insecticidal activities indicated that these compounds displayed moderate to excellent activities. In particular, 12i showed 100 and 37% larvicidal activities against oriental armyworm (Mythimna separata) at 0.25 and 0.05 mg L–1, equivalent to that of chlorantraniliprole (100%, 0.25 mg L–1; and 33%, 0.05 mg L–1). The activity of 12i against diamondback moth (Plutella xylostella) was 95% at 0.05 mg L–1, whereas the control was 100% at 0.05 mg L–1. The calcium-imaging technique experiment results showed that the effects of 12i on the intracellular calcium ion concentration ([Ca2+]i) in neurons were concentration-dependent. After the central neurons of Helicoverpa armigera were dyed by loading with fluo-5N and treated with 12i, the free calcium released in endoplasmic reticulum indicated the target of compound 12i is RyRs or IP3Rs. The activation of RyRs by natural ryanodine completely blocked the calcium release induced by 12i, which indicated that RyRs in the central neurons of H. armigera third-instar larvae is the possible target of compound 12i.
研究领域:
农药化学
·
昆虫生理学
·
药物化学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yixin Kuang,Suxin Zhou,Cheng Mao,Xiaoying Feng,Juan Zheng,Gangfeng Ouyang
High-resolution separation of numerous isomers is highly desirable for their high-quality analysis, yet challenging, which puts forward high requirements on the precise design of stationary phase. Herein, flexible 4- tert -butylcalix[n]arenes (TBCx[n]s) with different cavities have been intelligently integrated with in-situ grown UiO-66 coatings, to investigate their separation efficiencies for alkane and substituted benzene isomers. The modifications of UiO-66 with TBCx[n]s have made up for the deficiency of UiO-66 on the separation of ethylbenzene and styrene. The effects of TBCx[n]s on the separation performance of UiO-66@TBCx[n]s have demonstrated distinct regularities, i.e., the effects of TBCx[6] are superior to those of TBCx[8], while the TBCx[4] is the least effective. The baseline separation of all analytes has been achieved by the UiO-66@TBCx[6] column with enhanced selectivity and improved separation resolution (Rs). For the six groups of isomers that are most difficult to separate, the corresponding selectivity and Rs are greater than 1.09 and 5.48, respectively, confirming the outstanding separation performance of the UiO-66@TBCx[6] column and the feasibility of integrating soft supramolecule and rigid MOF.
研究领域:
化学工程
·
材料科学
·
分析化学
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产品关联
DOI
高影响因子
ARCHIV DER PHARMAZIE
·
2019
·Vol. 353
·期 2
·1900231
·
IF 2.145
Xiujie Liu,Xin Chen,Kai Qiu,Zhihao Zhang
A series of 4-methoxy-3-arylamido- N -(substitutedphenyl)benzamides 6a – u were designed according to the splicing principle of structural design in the medicinal chemistry theory and were synthesized in five steps: nitration, acylation, ammoniation, reduction, and secondary ammoniation. The structures of the target compounds were characterized and verified by infrared, 1 H nuclear magnetic resonance (NMR), 13 C NMR, and electron spray ionization spectroscopy. Their in vitro antiplatelet aggregation activities induced by adenosine diphosphate (ADP) or arachidonic acid (AA) were assessed by Born's method. The biological evaluation revealed that all compounds exhibited certain levels of activities in both of the antiplatelet aggregation assays; compounds 6c (IC 50 = 3.84 μM) and 6f (IC 50 = 3.12 μM) displayed the strongest antiplatelet aggregation activities in the ADP-induced and AA-induced assay, separately. Moreover, compounds that had stronger activities were chosen for cell toxicity testing via the cell counting kit-8 assay. The results indicated that none of the compounds had obvious cell toxicity against L929 cells at the doses of 10 and 20 μM. It is worth pointing out that compound 6c showed the highest antiplatelet activity and the lowest cell toxicity. In general, 4-methoxy-3-arylamido- N -(substitutedphenyl)benzamides have the potential to become a kind of safer and more effective antiplatelet agents.
研究领域:
药物化学
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
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