JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 1
·1-9
·
IF 1.434
Li Hanyuan,Wang Wei,Chen Guofei,Liu Yinfeng,Fang Xingzhong
Novel highly soluble phenylethynyl-endcapped oligoimides derived from mixed thioetherdiphthalic anhydride isomers ( m -TDPA) and 5(6)-amino-1-(4-aminophenyl)-1,3,3-trimethylindane (DAPI), 4,4′-oxydianiline (4,4’-ODA) with 4-phenylethynylphthalic anhydride (PEPA) as a reactive endcapping agent were synthesized. The calculated molecular weights of all the oligoimides were 2500 g·mol −1 .The effect of the mole ratio of DAPI/4,4’-ODA on solubility and melt viscosity of oligoimides as well as the thermal and mechanical properties of cured polyimide films was investigated. Experimental results indicated that DAPI greatly improved the solubility (>30 wt.%) of the oligoimides in low boiling points solvents when the content of DAPI was more than 10 mol% per total diamine. All the oligoimides exhibited very good processability with minimum melt viscosity lower than 60 Pa·s at about 330 °C. Tough and brown films were obtained after thermally cured at 370 °C for 1 h and dynamic mechanical analysis (DMA) showed that glass transition temperatures of the cured films increased up to 340 °C with the increasing content of DAPI. However, the thermal stability and mechanical properties decreased with the increase of DAPI content. The temperature of 5% weight loss was higher than 470 °C in both air and N 2 atmosphere obtained by thermogravimetric analysis (TGA). And the tensile strengths of the cured films were about 60 MPa.
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ChemistrySelect
·
2023
·Vol. 8
·期 9
·e202203332
·
IF 2.1
Cunwei Qian,Ying Wang,Xian Li,Changsheng Yao
Graphical A convenient, rapid and electrochemical one-pot protocol is designed for the synthesis of pyrazolo[3,4- b ]quinolines derivatives. The reaction is carried out in an undivided cell equipped with an iron cathode and a graphite anode in the presence of sodium bromide as a supporting electrolyte. Fourteen pyrazolo[3,4- b ]quinoline derivatives are obtained under a constant current of 30 mA after 0.14 F/mol of electricity passed. A convenient, rapid and electrochemical one-pot protocol was developed successfully for the preparation of pyrazolo[3,4- b ]-quinoline derivatives. The reaction is carried out in a 25 mL three neck flask equipped with graphite electrode as anode and iron electrode as cathode (electrode area of 1 cm 2 ) with sodium bromide as supporting electrolyte at room temperature in ethanol. Fourteen pyrazolo-[3,4- b ]-quinoline derivatives were synthesized by use of various aldehyde (including aryl aldehydes and aliphatic aldehydes), dimedone and 5-amino-3-methyl-1-phenylpyrazole as substrates in good yields (76–86 %) with a constant current of 30 mA after 0.14 F/mol of electricity passed. All aimed products were characterized by IR, 1 H NMR and HRMS. Notably, the presented method features ecologically sound, simple experimental procedure and good yields.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Yingmin Yu,Xiaocheng Zhang,Lingxiao Yi,Min Li,Fangyu Zhang,Jiajun Wei
Liquid–liquid equilibrium (LLE) data of ternary systems {2-ethyl-1-hexanol + ethylene glycol + water/n-heptane} were measured at 298.2, 308.2, and 318.2 K under 101.3 kPa. The distribution coefficient (D) and selectivity coefficient (S) of the systems were calculated to analyze the extraction ability of the two extractants that separate 2-ethyl-1-hexanol and ethylene glycol. Meanwhile, the NRTL and UNIQUAC activity coefficient models were used to correlate the experimental data and the different model parameters were obtained by data regression. The root-mean-square deviation (RMSD) between the calculated and experimental values was less than 0.96%, indicating that both models have a reasonable correlation with the experimental data of the ternary system and can accurately predict the experimental data. GUI-MATLAB has validated the binary interaction parameters.
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JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
Tao Bao,Juan Zhang,Wenpeng Zhang,Zilin Chen
Much attention is being paid to applying metal–organic frameworks (MOFs) as stationary phases in chromatography because of their fascinating properties, such as large surface-to-volume ratios, high levels of porosity, and selective adsorption. HKUST-1 is one of the best-studied face-centered-cubic MOF containing nano-sized channels and side pockets for film growth. However, growth of HKUST-1 framework inside capillary column as stationary phase for capillary electrochromatography is a challenge work. In this work, we carry out the growth of HKUST-1 on the inner wall of capillary by using liquid-phase epitaxy process at room temperature. The fabricated HKUST-1@capillary can be successfully used for the separation of substituted benzene including methylbenzene, ethylbenzene, styrene, chlorobenzene, bromobenzene, o -dichlorobenzene, benzene series, phenolic acids, and benzoic acids derivates. High column efficiency of 1.5 × 10 5 N/m for methylbenzene was achieved. The formation of HKUST-1 grown in the capillary was confirmed and characterized by scanning electron microscopy images, Fourier transform infrared spectra and X-ray diffraction. The column showed long lifetime and excellent stability. The relative standard deviations for intra-day and inter-day repeatability of the HKUST-1@capillary were lower than 7%.
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PubMed
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2022
·Vol. 52
·期 1
·91-104
·
IF 2
Yu Yingmin,Yi Lingxiao,Wei Jiajun,Guo Hongyue,Li Min
The liquid–liquid equilibrium (LLE) data for ethylene glycol + 2-ethyl-1-hexanol + { n -hexane, 1-hexene, 2-propyl-1-heptanol, and isopropyl ether} were measured at 298.2 K under 101.3 kPa. The distribution constant ( D ) and selectivity ( S ) of 2-ethyl-1-hexanol in the systems were calculated to analyze the extraction ability of the four extractants. The Bachman and Othmer–Tobias equations were chosen to examine the experimental LLE data. The linear correlation coefficient R 2 is greater than 0.98, indicating that the linear fitting of the experimental data is good. The data were regressed by thermodynamic models NRTL and UNIQUAC. The deviation between experimental data and simulated data was calculated by the root mean square deviation (RMSD) and the absolute average deviation (AAD). The RMSD is less than 0.79% and the AAD is less than 0.46%. It indicates that the two models are suitable for the regression of the system.
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ACS Applied Polymer Materials
·
2021
·
IF 4.089
Tianyou Chen,Zihao Wang,Wei Xiao,Changfeng Yi,Zushun Xu
Transformation of multifunctional homogeneous catalysts to the corresponding heterogeneous catalytic systems makes catalytic reactions interesting from both economic and environmental points of view. Here, we have devised a controllable and efficient strategy for the preparation of supported multifunctional catalysts by taking the Cu/2,2,6,6-tetramethyl-1-piperidine-N-oxyl (TEMPO) catalytic system as an example. Polystyrene-supported Cu/TEMPO catalysts were, for the first time, prepared via nanoprecipitation of polymers in water and efficient for aerobic oxidation of benzyl alcohol (BnOH). Cooperative behaviors could be regulated by precise control of local concentrations of functional groups. We have demonstrated that the incorporation of functional groups into polystyrene supports can make better use of catalytic components, resulting from confinement-enhanced cooperation. This strategy provides access to build more efficient multifunctional heterogeneous catalysts through establishing structure–activity relationships.
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SYNTHETIC METALS
·
2017
·
IF 2.435
Yuan Zhao,Xiaoliang Liu,Lu Lyu,Lin Li,Wenjun Tan,Shitan Wang,Can Wang,Dongmei Niu,Haipeng Xie,Han Huang,Yongli Gao
Modification by ultra-thin fullerene (C 60 ) insertion layer of about 1 monolayer on the electronic structure and the film growth of 2,7-diocty[1]benzothieno-[3,2-b]benzothiophene (C8-BTBT) on silicon oxide (SiO 2 ) is investigated using ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and X-ray diffraction (XRD). It is found that the ultra-thin C 60 insertion layer doesn’t induce an ambipolar charge transport characteristic but it indeed lifts up the energy levels of C8-BTBT, resulting in p-doping and hole accumulation at the semiconductor-dielectric interface. The charge transfer from trap states residing in the band gap of C8-BTBT to the lowest unoccupied molecular orbital (LUMO) of C 60 most likely leads to a decrease of threshold voltage for corresponding organic field effect transistors (OFETs) based on such a configuration. Band bending and decrease of the ionization potential (IP) are observed in the C8-BTBT film attributed to the increasing ordering of molecular orientation with the deposition of C8-BTBT. The HOMO downward shift is clearly bigger with the C 60 insertion layer than that without. A typical Volmer-Weber (VW) growth mode is detected due to the weaker van der Waals interaction between C8-BTBT and the underlying layer of C 60 /C8-BTBT than that between the C8-BTBT molecules. Compared to without C 60 interlayer, the molecular packing is a little more disordered at low coverages, resulting in more C8-BTBT molecules to lean away from the interface normal. The C8-BTBT film in such a structure phase has the HOMO closer to the E F than that at an almost perfectly vertically standing up configuration. Our results show that the introduction of C 60 insertion layer lifts up the HOMO of C8-BTBT and improves the energy level alignment at the interface.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Wei Ding,Xiaofeng Yuan,Ming Lu,Yuangang Xu
3-Nitro-1-(trinitromethyl)-1 H -pyrazole-4-carboxylic acid ( 4 ) and its corresponding ammonium ( 5 ) and hydroxylammonium ( 6 ) salts were successfully synthesized from 3-amino-1 H -pyrazole-4-carbonitrile. Their structures were characterized by infrared, nuclear magnetic resonance, elemental analysis, and confirmed by single-crystal X-ray diffraction to be triclinic P 1 ¯ ( 4 ), monoclinic C 2 /c ( 5 ) and Cc ( 6 ) Space group with 2, 8, and 4 molecules per unit cell. ADCH charge analysis revealed an uneven electron density distribution across the ring system of 4 , with notably high charge density around two oxygen atoms of the carboxyl group, which facilitates hydrogen bond formation. NICS aromaticity evaluation further confirmed the strong aromatic nature of the product, with an NICS(1)zz value below -20.0 ppm. Remarkably, the hydroxylammonium salt 6 not only retains outstanding detonation properties (detonation velocity D = 8878 m s - ¹, detonation pressure P = 35.60 GPa) but also demonstrates superior mechanical sensitivity (impact sensitivity IS = 12 J, friction sensitivity FS = 200 N). This achieves an optimal balance between high energy and low sensitivity, meeting the design objectives for high-energy insensitive materials. The findings offer valuable insights and experimental support for the molecular design of novel energetic compounds that integrate high energy performance with robust stability.
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Materials Today Bio
·
2025
·
IF 10.2
Yeyang Sun,Xietao Ye,Lin Yang,Shuo Dong,Chen Chen,Yani Wang,Jianan Qiao,Congyan Liu,Yuping Liu,Yan Chen
Programmed cell death protein 1 (PD-1) inhibitors are integral to contemporary cancer immunotherapy. However, their objective response rate in microsatellite-stable colorectal cancer (MSS CRC) remains below 5 %. This limited efficacy is primarily due to insufficient tumor-infiltrating lymphocytes (TILs), a consequence of the combined effects of low tumor immunogenicity and impaired dendritic cell (DC)-mediated antigen presentation. The combination of ursolic acid (Ua) and ginsenoside Rg3 (Rg3) enhances TIL infiltration by inducing immunogenic cell death (ICD) in tumor cells and promoting DC maturation. Due to their poor oral bioavailability, an oral ZIF nanoplatform was engineered with a chitosan oligosaccharide (Cos) and inulin (In) bilayer coating [(In/Cos)@Ua-Rg3-ZIF] for targeted delivery of Ua and Rg3 to the CRC microenvironment. Efficient dual-drug co-loading was achieved with a loading efficiency of 24.07 wt%. After oral administration, the (In/Cos) coating protects the formulation from degradation in the upper gastrointestinal tract, while specific enzymatic cleavage by colonic microbiota releases Ua-Rg3-ZIF into tumor tissues. The ZIF platform responds to elevated adenosine triphosphate (ATP) in the tumor microenvironment, enabling controlled release of Ua and Rg3 to enhance cytotoxic T lymphocyte (CTL) levels. In vivo studies demonstrate that combining (In/Cos)@Ua-Rg3-ZIF with α-PD-1 results in an 80.86 % tumor inhibition rate, significantly outperforming monotherapies. This strategy presents an innovative oral delivery system capable of resisting gastrointestinal degradation and facilitating microbiota-responsive drug release, effectively enhancing antitumor immunity and improving the therapeutic outcome of immunotherapy in MSS CRC.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Hong-Wei Di,Xing-Qiang Zhao,Xin-Ru Zhang,Jiangping Cao,Ya-Ting Wang,Hua He,Jun-Ling Dong,Chao Fan,Nan Zhang
With the development of industry, the treatment of industrial waste water containing metal ions has become a difficult problem in environmental governance. Polymer fluorescent probe is an effective method for identifying and enriching metal ions in waste water. The ring ‒ opening polymerization of ε ‒ caprolactone was initiated with 1 ‒ pyrene methanol as the initiator and the fluorescent group, and then it was chemically linked with the recognition group dimethylpyridine amine by 2‒chloroacetyl chloride to obtain the polymer fluorescent probe L. The chemical structure of polymer fluorescence probe L was confirmed by 1 H NMR. The recognition performance of polymer fluorescence probe L for metal ions was studied by fluorescence spectra. The results show that the polymer fluorescence probe L has specific recognition ability for metal ion Zn 2+ . By optimizing the optical properties, the selectivity and anti-interference ability of fluorescence probe L to Zn 2+ were improved. The linear recognition range of Zn 2+ is from 2 × 10 –6 mol ∙ L -1 to 9 × 10 –6 mol ∙ L -1 , and the detection limit is 6.38× 10 –7 mol ∙ L -1 . According to the plot curve of job, the complex ratio of Zn 2+ and probe L is 1 : 1. The fluorescence principle of coordination between dimethylpyridine amine (DPA) and zinc ion (Zn 2+ ) mainly involves the inhibition of photo induced electron transfer (PET) mechanism. In summary, probe L can be used to detect Zn 2+ in acetonitrile rapidly, so it has a certain application value in the identification and separation of metal ions in industrial waste water.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Mengyao Gui,Hongwei Yang,Erming Ouyang
Polystyrene nanoplastics (NPs), ubiquitous contaminants in aquatic ecosystems, are known to impede conventional anoxic denitrification processes. However, their effects on aerobic denitrification systems remained poorly understood. This study systematically elucidates the mechanistic interactions between polystyrene NPs and aerobic denitrification performance. Results revealed polystyrene NPs caused concentration-dependent suppression of denitrification efficiency in the aerobic denitrifier Pseudomonas stutzeri PCN-1 under controlled laboratory conditions (aerobic, 30 ℃). At NPs concentrations escalating from 100 to 1000 μg L⁻¹ , nitrate removal rates decreased markedly (0.4–3.3 mg L⁻¹ h⁻¹), paralleled by progressive accumulation of nitrite (8.8–87.2 mg L⁻¹) and N₂O (31.2–58.3 mg L⁻¹). Mechanistic analyses revealed that polystyrene NPs induced biotoxic effects through two primary pathways: (1) disruption of cellular membrane integrity and (2) excessive generation of reactive oxygen species (ROS), collectively impairing bacterial viability and metabolic activity. Furthermore, critical denitrification processes were compromised, including diminished electron transport system activity, reduced catalytic activities of key denitrification enzymes, and downregulation in transcriptional expression of functional genes (e.g. napA , nirS , cnorB , and nosZ ). These multilevel inhibitions collectively contributed to the observed deterioration in nitrogen removal capacity. This investigation provides novel insights into the ecotoxicological risks posed by NPs to microbial nitrogen cycling in aquatic environments.
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RADIATION PHYSICS AND CHEMISTRY
·
2025
·
IF 3.3
Hanqin Weng,Baoying Zhang,Yizhi Chen,Shinichi Yamashita,Yusa Muroya,Hao Yu,Xinrui Zhang,Xiaofan Yang,Weiqun Shi
The ligand of 2,9-Diamide-1,10-phenanthroline (DAPhen), developed for group actinide separation in the past decade, showed excellent extraction and separation performance for various actinides from trivalent lanthanides. However, its radiolysis mechanism remains unclear, restricting its application. Mechanism for the radiolysis of three different DAPhen in 1-octanol was studied by pulse radiolysis, of which the results demonstrated that reductive degradation was the main route of their radiolysis in 1-octanol. Solvated electrons (e sol − ), and α-hydroxyoctyl radicals have been recognized as the most important transient species responsible for DAPhen radiolysis. Rate constants for the reactions of e sol − with N,N′ -diethyl- N,N′ -ditethyl-2,9-diamide-1,10-phenanthroline (Et–Et-DAPhen, EED), N,N′ -dioctyl- N,N′ -ditoctlyl-2,9-diamide-1,10-phenanthroline (Oct-Oct-DAPhen, OOD), and N,N′ -diethyl- N,N′ -ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen, ETD) were estimated to be 1.9 × 10 9 , 2.3 × 10 9 , and 1.5 × 10 9 L mol −1 s −1 , respectively. Those of α-hydroxyoctyl radicals with EED, OOD, and ETD were approximately 1.1 × 10 8 , 2.1 × 10 8 , and 2.7 × 10 8 L mol −1 s −1 , respectively. The studied DAPhen exhibited high reactivity with e sol − , and α-hydroxyoctyl radicals in 1-octanol, resulting in their vulnerability under irradiation. A versatile strategy was accordingly proposed to enhance their radiation stability based on the insights into transient processes of DAPhen radiolysis. If the HNO 3 -equilibrated organic phase was saturated with nitrous oxide (N 2 O), the reductive species responsible for DAPhen degradation would be scavenged. As a consequence, the radiation-resistance of DAPhen was significantly improved because the key elementary reaction of radiolysis was inhibited by the synergetic effect of N 2 O and HNO 3 .
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