Polymers
·
2019
·Vol. 11
·期 7
·1152
·
IF 3.164
Huiqin Zhang,Pan Liu,Zheng Chi,Xuegang Chen
Hydrophilic copolymers containing 2,2′:6′,2″-terpyridine moieties and acrylic acid (AA) units poly (acrylic acid-co-4-(2,2′:6′,2″-terpyridin-4′-yl)styrene) (P(AA-co-TPY)) were synthesized and characterized. Coordinated with different transition metal ions, the dilute aqueous solution of the copolymers exhibited red-shifted UV-vis absorption peaks of π-π* transition from 317 to 340 nm. Further, interacting with iron ions, the copolymer showed new absorption peaks at a longer wavelength region (570 nm) and the absorption intensity enhanced with increase of the ion concentration. When enough ions were added to coordinate with the 2,2′:6′,2″-terpyridine moieties, novel metallo-supramolecular hydrogels were obtained due to the formation of metal coordination bonds between polymer back bones and transition metal ions (Ni2+, Zn2+, Cd2+, Fe2+and Cu2+), which acted as self-assembly crosslinking structures. The mechanical strength and morphology of the resulting metallo-supramolecular hydrogels have been investigated.Keywords:terpyridine;hydrophilic polymer;metallo-supramolecular;hydrogels
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
DESIGNED MONOMERS AND POLYMERS
·
2012
·
IF 1.444
Mingfu Huang,Li Wang,Xiaolong Li,Shanyin Yan,Kelvin W.K. Yeung,Paul K. Chu,Zushun Xu,Changfeng Yi
A novel pyridine-containing aromatic diamine monomer, 4-[4-hydroxyphenyl]-2,6-bis[4-(2-aminophenoxy)phenyl]pyridine (p,o-HAPP), was synthesized by a modified Chichibabin reaction of p-Hydroxybenzaldehyde and a substituted acetophenone, 4-(2-nitrophenoxy)acetophenone (p,o-NPAP), followed by a reduction of the resulting dinitro compound 4-[4-hydroxyphenyl]-2,6-bis[4-(2-nitrophenoxy)phenyl]pyridine with Pd/C and hydrazine monohydrate. The aromatic diamine was employed to prepare a series of pyridine-containing polyimides (PIs) by polycondensation with various aromatic dianhydrides in N,N-dimethylformamide (DMF) via the conventional two-step method. The inherent viscosities of the resulting poly(amic acids) and PIs were in range of 0.62–0.76 and 0.52–0.64 dL/g, respectively. The obtained novel PIs exhibited high solubility in common organic solvents, such as m-Cresol, DMF, N,N-dimethylacetamide, dimethylsulfoxide, N-methylpyrrolidone (NMP), tetrahydrofuran, and chloroform. Meanwhile, flexible PI films were obtained, which had excellent thermal stability, with the glass transition temperature (T
g) of 259.8–323.4 °C and the temperature at 10% weight loss of 485.5–576.4 °C in nitrogen atmosphere. The protonated polymer showed UV–vis absorption in the region 200–400 nm and displayed strong fluorescence intensity (470 nm) in NMP solution.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2019
·Vol. 220
·期 9
·1800553
·
IF 2.622
Da Xu,Yanwei Gao,Yang Sun,Zhaoyang Wang,Zhenhua Jiang,Xiangyu Jiang,Haibo Zhang
Polyaryletherketones (PAEKs) with pendant pyrene groups are prepared and used to functionalize and disperse graphene nanoplates (GNPs). A variety of polymers with a range of pyrene contents are studied. A monomer with pyrene and two hydroxyl groups is designed and synthesized through the Suzuki reaction and used to prepare a series of pyrene-functioned PAEKs (Py-PAEKs) by copolymerization. Experiments demonstrate that Py-PAEKs have not only excellent solubility, but also excellent mechanical properties and outstanding heat resistance. In the same treatment condition, the concentration of GNPs that are modified by Py-PAEK with 40 molar percentage of pyrene (Py-40) increases 88 times of the concentration of pure GNPs in NMP. In addition, adding 0.5% GNPs, which is functionalized by Py-40 to PEEK resin, improves the flexural strength of polymer composite nearly 12% and while the tensile strength of these composites improves nearly 10% with a doubling of the strain at break.
研究领域:
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Xiaofeng You,Yan Wang,Lin Han,Qing Liu,Zhaoyang Fei,Xian Chen,Zhuxiu Zhang,Jihai Tang,Mifen Cui,Xu Qiao
Hyper-cross-linked resin has enormous potential in the removal of organic dyes from aqueous solutions due to its adjustable porous structure and designable chemical properties, whereas its poor adsorption capacity limits the application. In this study, the co-modified hyper-cross-linked resin (HCP-x) with tunable porosity was synthesized by adjusting the dosages of 4-vinylpyridine (4-VP) and 4-vinylbenzoic acid (4-VA) in the polymerization process. The results indicated that pores in the range of 4–12 nm show up in HCP-x resin with the addition of 4-VP and 4-VA. Particularly, the polymer containing 10% by weight of monomer (HCP-90) had the highest specific surface area, the largest micropore volume and a bigger mesoporous volume in the terpolymer . The adsorption experiment results demonstrated that HCP-90 showed 4 times increased Rhodamine B adsorption than the original resin. This study described a simple method to co-modify the hyper-cross-linked resin by introducing two functional monomers, and the modified material was potential for Rhodamine B adsorption.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 16
·47395
·
IF 1.901
Xu Han,Jilin Wang,Lulu Wang
A series of anion exchange membranes [pyridine functionalized-poly(vinyl alcohol)-1,4-dichlorobutane (PVA-PY-DL x )] were synthesized by using PVA-PY as polymer matrix and DL as crosslinker and iodomethane as quaternization reagent. During the experiment, pyridine groups grafted on PVA were transformed into quaternary ammonium group during the formation process of the crosslinked structure and the quaternization routine by iodomethane. The characterization results revealed that the PVA-PY-DL x membranes have been successfully prepared and the crystallinity increases with increase of DL. PVA-PY-DL x membranes have smooth and uniform morphology. The introduction of crosslinked structure improves the mechanical properties and dimensional stability of the PVA-PY-DL x membrane, enhances the alkali resistance. When the mass content of DL was 4.0%, composite membrane had the maximum tensile strength (44.2 MPa), and the OH − conductivity reaches 1.05 × 10 −2 S cm −1 at 70 °C. The accelerated aging experiment was carried out in 3 mol L −1 potassium hydroxide (KOH) solution for 120 h at 80 °C, which revealed that the anionic conductivity of PVA-PY-DL 4.0 membrane retains 79.6% of its initial conductivity, showing better stability of alkali stability. Methanol permeability of PVA-PY-DL x membranes was only the 0.37–0.72% of the Nafion-117 membrane in 3 mol L −1 methanol at 60 °C. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47395.
研究领域:
高分子科学
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材料化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Zheng Yan,Qinghua Gu,Xin Ke,Jianchao Gu,Huiping Shao
In order to address the issue of protonation of functional groups and structural instability on the surface of aerogel due to strong acidic wastewater, a three-dimensional bis-pyridine N cellulose aerogel [PEIPD/carboxymethyl cellulose (CMC)] with protonation resistance was prepared in this paper by grafting pyridine onto polyethylenimine. The adsorption capacity for Cu2+ of the as-prepared aerogel is as high as 1.64 mmol/g (pH 5) and is maintained well in high-acidity solutions (1.15 mmol/g at pH = 2). It reveals high selectivity, splendid anti-interference ability, and also reliable on the recycle performance. Through the zeta potential tests, this adsorbent reveals a rather low zero charge point (pHpzc = 2.2). The adsorption of Cu2+ on the adsorbent is consistent with the pseudo-second-order kinetic model and the Langmuir model, suggesting that the adsorption process is dominated by chemisorption in a monolayer. The characterizations by Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy proved pyridine N as responsible binding sites, based on which two possible mechanisms are proposed, including chelation and cation–π interaction. Density functional theory calculations are further used to precisely investigate the pathway. By comparing the binding energies, molecular electrostatic potentials, electron densities, and differential charge densities, the bis-pyridine N functional group is finally determined to be of much higher affinity to Cu2+ following chelation reaction as designated. By integrating bis-pyridine N with the CMC and understanding their crucial roles, this will provide significant insights into the rational design of aerogel adsorbents to enhance the recovery of Cu from strongly acidic wastewaters.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Qingtao Niu,Maifen Yang,Xingan Wang,Aihua He,Manman Jin
Immobilization of active site on solid support plays great roles in improving catalyst performance. In this study, a series of solid supported iron precatalysts via the immobilization of iron halides (FeX n , X = Cl, Br or I, n = 2 or 3) on the metal-organic frameworks of UiO type bearing bipyridine moiety (bpy-UiO) were synthesized and used for isoprene polymerization. These bpy-UiO supported iron precatalysts (bpy-UiO-FeX n ) were also well characterized by the powder X-ray diffraction, elemental analysis and N 2 adsorption measurement. Upon activation with trialkylaluminums (AlEt 3 , Al(i-Bu) 3 and AlOct 3 ), bpy-UiO-FeX n exhibited excellent catalytic activity for isoprene polymerization. Interestingly, the iron(III) precatalysts had higher activity than the iron(II) precatalysts, and the highest activity was 1726.4 Kg⋅P/(mol⋅Fe⋅h) for bpy-UiO-FeBr 3 with AlEt 3 . Moreover, the activity gradually increased as the polymerization temperature increased from 0 °C to 50 °C, reflecting the fact that the MOFs supported iron catalysts had excellent thermal stability. Notably, the obtained polyisoprene had the ultrahigh molecular weight ( M w = 1.20×10 6 –3.13×10 6 Daltons), and predominantly consisted of 38.5–54.4 mol % cis -1,4 configuration and 45.6–61.5 mol % 3,4-configuration. This work offers an opportunity to design the high active and stable iron catalyst for conjugated diene polymerization based on the solid support.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 31
·5057-5066
·
IF 5.342
Jianrui Zhang,Xiaocui Han,Cheng Yue,Di Liu,Ziyu Lin,Yirong Sun,Liyuan Chen,Jinhui Pang,Zhenhua Jiang
A new diamine monomer with a dioxinyl bipyrimidine group was synthesized. Polyimide containing a bipyrimidine group was successfully homopolymerized by chemical imidization. Analyses to determine the structure and properties of these polymers were conducted using 1H NMR and FTIR spectroscopy and gel permeation chromatography (GPC). For the first time, cobalt acetate was incorporated into the synthesized polyimide to fabricate cobalt-complexed polyimide thin film composite membranes (TFCMs) by spin coating. To fully understand the behavior of cobalt complexed TFCMs, these membranes were synthesized and then characterized by FTIR spectroscopy, X-ray diffraction (XRD), and differential scanning calorimetry (DSC) to survey the effects of cobalt acetate on polyimide. The morphologies of TFCMs were determined using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Phase separations and defects were absent in all cobalt-complexed TFCMs; the average thickness of the films ranged from 550 to 600 nm. This strongly suggested that cobalt acetate has good compatibility with bipyrimidine polyimide. The gas separation performance for TFCMs was also determined with the following results: the CO2 permeance of DMD-PI-3.0 (mixing 3.0 wt% cobalt acetate) TFCMs was 69.9 GPU at 35 °C and 1.5 bar while the selectivity of CO2/CH4 was 44.79 for DMD-PI-15 TFCMs. In short, this work reports a promising method to utilize the separation characteristics of polyimide TFCMs by incorporating cobalt ions.
研究领域:
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
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 3
·668-673
·
IF 1.307
Feng Fan,Li Jing,Zhang Zhihui,Fu Jiaxu,Zhang Yumin,Gu Qiang
A n ultrasonic-assisted synthesis of bis-isoxazole derivatives was developed. Eight 3-(6-chloropyridin-3-yl)-5-{[(3-arylisoxazol-5-yl)methoxy]methyl}isoxazoles were synthesized by 1,3-dipolar cycloaddition reaction between substituted isoxazolyl alkyne compounds and 6-chloro- N -hydroxynicotinimidoyl chloride. The structures of the synthesized compounds were confirmed by HRMS, FTIR, 1 H and 13 C NMR spectroscopy. Wherein, the antifungal and antibacterial activities of target compounds were tested. The synthesized compounds 6 a and 6 h exhibited better antifungal activity in comparison with the standard drug itraconazole. The minimum inhibitory concentrations(MICs) of both compound 6 a and compound 6 h were both 4 µg/mL against Candida albicans ATCC 10231.
研究领域:
有机化学
·
药物化学
·
微生物学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wei Xu,Chenxi Gao,Yunyun Zhang,Mingxia Sun,Hongdeng Qiu,Jia Chen
Untreated radioactive iodine poses a significant risk to both the environment and human health, so developing efficient adsorbents for the adsorption of radioactive iodine has become a top priority. In this study, we innovatively synthesized two ionic self-assembled single-crystal materials: HBP-PyTS and VBp-PyTS. The former comprises pyridine group organic cation and sulfonic acid group anion, while the latter contains quaternary ammonium group organic cation and sulfonic acid anion. These materials were synthesized using an environmentally friendly, simple, and relatively stable method. Besides, they were composed of ionic bonds and boasted abundant adsorption sites, which are highly effective at capturing iodine. Furthermore, a comparison of the adsorption capacity of these two materials reveals that the pyridine group is more conducive to the adsorption of iodine vapor. The HBP-PyTS material displayed excellent stability in both water and organic solvents, with an adsorption capacity of 2.2 g g −1 for I 2 at 70 °C and an iodine adsorption in iodine-cyclohexane solution of 51.2 mg g −1 . The HBP-PyTS displays a higher adsorption capacity due to the electron transfer complex mechanism and their specific surface area and pore size. This suggests that the material possesses superior adsorption properties compared to other materials, offering a promising strategy for developing a new type of iodine adsorption material.
研究领域:
材料科学
·
放射化学
·
环境科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 10
·4584-4591
·
IF 3.591
Lin Lin,Zeping Huang,Yuanqi Luo,Tingen Peng,Baitian He,Guiting Chen,Hongqing Hao,Xin Li,Ping Cai,Wei Yang
The synthesis and application as a cathode interfacial material (CIM) for organic solar cells (OSCs) of a fluorene-based conjugated small molecule (3FPy) with pyridyl functional side chains are presented. 3FPy is soluble in MeOH containing trace AcOH due to the interaction between pyridyl and AcOH, offering opportunities to fabricate multilayer OSCs by orthometric solution methods. When 3FPy was introduced into the conventional OSCs of both poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b′]dithio-phene-2,6-diyl-altethylhexyl-3-fluorothithieno[3,4-b]thiophene-2-carboxylate-4,6-diyl] (PTB7):[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) and poly[(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b′]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene)-2-carboxylate-2-6-diyl)] (PTB7-Th):PC71BM systems, significant simultaneous improvements in open-circuit voltage (Voc) and fill factor (FF) were achieved. It was found that pyridyl groups could lessen the cathode's work functions by interfacial dipoles, subsequently enlarging the built-in potentials and Voc. For the FF enhancements, the working mechanisms for 3FPy consisted of suppressing the devices’ dark currents, reducing the charge transport loss by n-doping PC71BM, and optimizing the contacts at the active layer/cathode interfaces. Therefore, this kind of novel small molecule is a promising CIM for high-performance OSCs.
研究领域:
材料科学
·
能源技术
·
有机电子学
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 7
·2987-3006
·
IF 3.134
Zhao Yifan,Li Wensi,Rehman Mooeez Ur,Wang Shengping,Li Guobing,Xu Yan
A series of N-modified Ru/N x -AC catalysts were prepared by ammonia treatment method and applied in dioctyl phthalate hydrogenation, which is a cascade reaction system involving partial hydrogenation of aromatic ring and the further saturated hydrogenation of the formed intermediate bis(2-ethylhexyl) cyclohexene-1,2-dicar-boxylate (DH 4 ) to dioctyl di-2-ethylhexylcyclohexane-1,4-dicar-boxylate (DEHCH). N doping was found to be able to increase the nitrogen-containing pyridine groups on the activated carbon (AC) surface, resulting in the abundance of binding sites for anchoring Ru and exceptionally enhancing the dispersion of Ru nanoparticles. Furthermore, the N-modified Ru/N 12 -AC catalyst exhibited a significantly higher turnover frequency value (1260.06 h −1 ) than Ru/AC catalyst (913.64 h −1 ). It was deduced that the presence of the pyridine groups could improve the adsorption of intermediate DH 4 by promoting the coverage of DH 4 on the catalyst surface. The environment of surface-enriched DH 4 accelerated the reaction rate of DH 4 hydrogenation and increased the selectivity to DEHCH. Therefore, the cooperation between highly dispersed Ru nanoparticles and pyridine groups supports remarkably enhanced the activity and selectivity. In addition, the Ru/N 12 -AC catalyst presented excellent catalytic activity and versatility in the hydrogenation of other phthalates such as dimethyl phthalate, diethyl phthalate, and dibutyl phthalate, demonstrating its prospective application in phthalate esters hydrogenation. Graphical abstract
Description N-doping exceptionally improved Ru dispersion and the adsorption of the intermediate product in DOP hydrogenation, leading to a higher activity and selectivity to saturated product.
研究领域:
催化
·
化学工程
·
材料科学
·
有机化学
✓ 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）