EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Qingqing Ye,Baozhong Zhang,Yanhua Yang,Xiaoyu Hu,Yingzhong Shen
Two different aromatic diamines monomers (3, 5-diamino-N-(4'-phenyl-4''-triphenylamino)-N-(4''-benzyl-4'''-triphenylamino)benzamide (DPTBTB) and 3, 5-diamino-N-(4'-3'', 4'', 5''-trifluorobiphenyl)-N-(4''-benzyl-3''', 4''', 5'''-trifluorophenyl)benzamide (DTBTB)) containing flexible linkages were designed and synthesized, respectively. Four organo-solubility polyimides (PI-a, PI-b, PI-c, and PI-d) were prepared via a two-step procedure with pyromellitic dianhydride (PMDA) and 3, 3', 4, 4'-biphenyltetracarboxylic dianhydride (BPDA), respectively. The four PIs performed excellent thermal stability with the temperature of 5% weight loss in range of 370–420 ℃ at N 2 atmosphere. The Al/PI-a/ITO and Al/PI-b/ITO memory devices exhibited binary write-once-many-read (WORM) and rewritable (Flash) behavior, respectively. But the Al/PI-c/ITO and Al/PI-d/ITO memory devices showed ternary WORM and Flash behavior due to the deeper charge traps came from the fluorinated groups in the structure of PI-c and PI-d, respectively. The memory switching mechanism could be demonstrated through molecular simulation. The results gave an effective strategy that adjusting the structure of PI to achieve different memory effects.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 38
·期 3
·213-219
·
IF 2.804
Qian Chao,Fan Zhen-Guo,Zheng Wei-Wen,Bei Run-Xin,Zhu Tian-Wen,Liu Si-Wei,Chi Zhen-Guo,Aldred Matthew P.,Chen Xu-Dong,Zhang Yi,Xu Jia-Rui
High-performance low- k and low-loss circuit materials are urgently needed in the field of microelectronics due to the upcoming Fifth-Generation Mobile Communications Technology (5G Technology). Herein, a facile design strategy for non-fluorinated intrinsic low- k and low-loss polyimides is reported by fully considering the secondary relaxation behaviors of the polymer chains. A new amorphous non-fluorinated polymer (TmBPPA) with a k value of 2.23 and a loss tangent lower than 3.94 × 10 −3 at 10 4 Hz has been designed and synthesized, which to the best of our knowledge is the lowest value amongst the non-fluorinated and non-porous polymers reported in literature. Meanwhile, TmBPPA exhibits excellent overall properties, such as excellent thermostability, good mechanical properties, low moisture absorption, and high bonding strength. As high-performance flexible circuit materials, all these characteristics are highly expected to meet the present and future demands for high density, high speed, and high frequency electronic circuit used in 5G wireless networks.
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CARBOHYDRATE POLYMERS
·
2014
·
IF 3.916
Qingyuan Niu,Kezheng Gao,Wenhui Wu
A cellulose nanofibril film is modified by chemical assembly of boronate-terminated conjugated polymer chains at its specific sites, C-6 carboxyl groups. The modified cellulose nanofibril film is used as a fluorescent sensor for nitroaromatic vapor. Thanks to the specific reactive sites, numerous loose cavities or pathways located in the film sensor's out-layer have been formed, and the fraction of easily accessible cavities of the novel fluorescent film sensor is up to 0.97, which could benefit the penetration and diffusion of analyte vapor. Therefore, the novel fluorescent film sensor exhibits high sensitivity toward nitroaromatic vapor with a fast response. The fluorescence quenching efficiency of the chemical-assembly film sensor is about 3 times larger than that of the spin-cast film sensor using the same conjugated polymer for 600 s exposure to DNT vapor. In addition, the novel fluorescent film sensor shows good reversibility.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2015
·
IF 2.353
Yuanyuan Yue,Qiao Dong,Yajie Zhang,Xiaoge Li,Xuyang Yan,Yahui Sun,Jianming Liu
Small molecular drugs that can combine with target proteins specifically, and then block relative signal pathway, finally obtain the purpose of treatment. For this reason, the synthesis of novel imidazole derivatives was described and this study explored the details of imidazole derivatives binding to human serum albumin (HSA). The data of steady-state and time-resolved fluorescence showed that the conjugation of imidazole derivatives with HSA yielded quenching by a static mechanism. Meanwhile, the number of binding sites, the binding constants , and the thermodynamic parameters were also measured; the raw data indicated that imidazole derivatives could spontaneously bind with HSA through hydrophobic interactions and hydrogen bonds which agreed well with the results from the molecular modeling study. Competitive binding experiments confirmed the location of binding. Furthermore, alteration of the secondary structure of HSA in the presence of the imidazole derivatives was tested.
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RSC Advances
·
2014
·Vol. 4
·期 58
·30914-30922
·
IF 3.708
Mingxi Chen,Zhe Zhang,Lingzhi Li,Yu Liu,Wei Wang,Jianping Gao
Ultrafine Ag–Pd bimetallic nanoparticles homogeneously distributed on reduced graphene oxide (rGO) were prepared by redox reactions between Pd2+, Ag+ and GO. This method is simple, and the use of rGO as a support facilitated the separation and reuse of the Ag–Pd@rGO catalyst. The Ag–Pd@rGO bimetallic nanoparticles were characterized by ultraviolet-visible spectroscopy, Raman spectroscopy, thermogravimetric analysis, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The microstructure of the Ag–Pd@rGO was investigated with scanning electron microscopy and transmission electron microscopy. The Ag–Pd@rGO catalyst exhibited high catalytic activities in the Suzuki-Miyaura carbon coupling reaction and the Sonogashira carbon coupling (SCC) reaction. These reactions used mild, efficient, ligand-free and heterogeneous conditions. Interestingly, the presence or absence of oxygen in the SCC catalytic system resulted in two different products, in which oxygen can be used as “switch” to control different products.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Xiaodan Zhao,Jun Ma,Jin Jiang,Yuhuan Bao,Huiling Liu
Synergistic enhancement of phenols and anilines removal was investigated in permanganate oxidation in the presence of multi-walled carbon nanotubes (CNTs). Then the attendant dehalogenation was explored for bromophenols and bromoanilines from the perspective of dehalogenation number (DN). Permanganate decay and total manganese concentration decrease in the presence of CNTs indicates considerable formation of manganese dioxide (MnO 2 ) on carbon surface. The CNTs-enhanced phenol degradation is more favorable under lower pH, confirming that the generation of MnO 2 induced by the reaction between permanganate and CNTs enhances the phenol oxidation by permanganate. The first order rate constants of respective bromophenols and bromoanilines suggest the synergistic enhancement of CNTs and permanganate in removing these micropollutants. Bromide release experiments clearly demonstrate that the subsequent dehalogenation accompanying the oxidation of bromophenols and bromoanilines is significant for permanganate oxidation in the absence/presence of CNTs. Dehalogenation by permanganate follows the order of 4-bromophenol > 2-bromophenol > 3-bromophenol and 4-bromoaniline > 2-bromoaniline > 3-bromoaniline, respectively. Higher DN values in the presence of CNTs indicate a reduced dehalogenation. In real water application, permanganate in the presence of CNTs could effectively remove 4-bromoaniline with a maximum removal efficiency of ∼95% and a bromide release of 2 μM.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Qinrui Fu,Yuan Meng,Zilin Fang,Quanqin Hu,Liang Xu,Wenhua Gao,Xiaochun Huang,Qiao Xue,Ya-Ping Sun,Fushen Lu
Boron nitride nanosheets (BNNS) were used to anchor bimetallic Pd–Fe nanoparticles for Suzuki–Miyaura coupling catalysts. The bimetallic nanoparticles were found to be core–shell in structure, and their formation was likely facilitated by their interactions with the BNNS. The Pd–Fe/BNNS catalysts were highly effective in representative Suzuki–Miyaura reactions, with performances matching or exceeding those of the state-of-the-art methods. Specifically, the superior catalytic activities were characterized by generally shortened reaction times, minimal Pd usage, excellent reusability of the catalysts and high or nearly quantitative conversion yields in a benign solvent system without the need for any special conditions, such as ligands and surfactants or inert gas protection. The obvious advantages of the Pd–Fe/BNNS over similar catalysts based on other supports, such as reduced graphene oxide (rGO), suggest that BNNS may be developed into a versatile platform for many other important catalytic reactions.
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Molecular Catalysis
·
2024
·
IF 3.9
Zhifeng Yu,Chenqi Zhao,Zhelun Xiong,Zicheng Xiao,Meng He,Yining Wu,Yu Wang,Pingfan Wu,Wei Guo,Ning Zhang,Minghui Liang
The interaction between metals is an important factor to modify the catalytic roles of metallic catalysts, and it is highly desirable to reveal the relationship between metal-metal interaction and catalytic performance. Three types of Ir-Cu catalysts including Cu single atoms modified Ir nanoparticles and Ir-Cu alloy catalysts are prepared to observe the modifying role of Cu on Ir. Under relatively high temperature treatment, Ir-Cu alloy can be produced from Cu single atoms and Ir nanoparticles. The selectivity to bromoaniline (BAN) over Cu/C-Ir catalyst can be up to 99.9 % at the 100 % conversion of bromonitrobenzene (BNB), which is higher than that over Ir/C (94.3 %) and Ir-Cu/C alloy catalyst (98.5 %). The turnover frequencies (TOFs) of Cu/C-Ir catalysts are evidently lower than that of the Ir-Cu/C alloy catalyst, though their dispersions are higher than that of Ir-Cu/C alloy catalyst. The electronic transfer from Cu single atoms to Ir nanoparticles not only weakens the hydrogen adsorption ability but reduces the number of active sites available for splitting hydrogen molecules into hydrogen atoms, leading to a decrease in the catalytic activity for the selective hydrogenation of BNB. The interaction exerted by unalloyed Cu single atoms on Ir nanoparticles differs from that of alloyed Cu on Ir, which may be the possible reason for the different catalytic performance between Cu single atoms modified Ir nanoparticles and Ir-Cu alloy.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mingyang Guan,Ziyang Huang,Ziting Bao,Yourong Ou,Siyi Zou,Guozhen Liu
Liquid metals, especially for eutectic gallium-indium (EGaIn) have become popular materials in various bioapplications due to their fluidity, conductivity, biocompatibility and antibacterial properties. However, gallium can rapidly form oxide films at ambient conditions, limiting its performance. Taking advantages of the hydrogen bonding between amine groups and gallium oxide interface on EGaIn, EGaIn nanoparticles are modified with p -phenylenediamine (PPD) to inhibit oxidation and attach gold nanoparticles (AuNPs) to achieve EGaIn-PPD@Au nanoparticles. The addition of PPD in making EGaIn nanoparticles can diminish the oxidation of gallium while forming the ligand shell on EGaIn with amine groups. EGaIn-PPD@Au nanoparticles demonstrate high electrical and thermal conductivity together with outstanding photothermal capability. EGaIn-PPD@Au based wearable skin patch can be modified with aptamers for electrochemical detection of C-reactive protein, achieving detection limit of 0.5 mg L -1 . A pressure sensor patch fabricated by incorporating EGaIn-PPD@Au into polydimethylsiloxane (PDMS) can withstand more than 4 MPa pressure (error of less than 0.003 MPa −1 ). EGaIn-PPD@Au based PDMS photothermal patches also demonstrate anti-inflammation and wound healing properties in S. aureus treated inflammation rat model.
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LUMINESCENCE
·
2024
·Vol. 39
·期 4
·e4729
·
IF 3.2
Han Qian,Jiazhuang Tian,Xiaozhou Jiang,Bangcui Zhang,Xueliang Li,Yanhua Yang,Shulin Gao,Lin Shao,Fumin Li
To further explore the relationship between aryl substituents and mechanofluorochromic (MFC) behaviors, four salicylaldimine-based difluoroboron complexes (ts-Ph BF 2 , ts-Ph-NA BF 2 , ts-2NA BF 2 , and ts-triphenylamine [TPA] BF 2 ), including aromatic substituents with different steric hindrance effects, were designed and successfully synthesized. Four complexes with twisted molecular conformation displayed intramolecular charge transfer and aggregation-induced emission properties. Under external mechanical stimuli, the as-synthesized powders of ts-Ph BF 2 , ts-Ph-NA BF 2 , and ts-TPA BF 2 exhibited redshift fluorescence emission behaviors, and ts-Ph BF 2 and ts-TPA BF 2 could be recovered to original shifts by fuming, but ts-Ph-NA BF 2 displayed irreversible switching. ts-2NA BF 2 had no change during the grinding and fuming processes. The results indicated that the MFC behaviors could be attributed to the phase transformation between the well-defined crystalline and disordered amorphous states by X-ray diffraction measurement. Further research illustrated that ts-TPA BF 2 with the most significant MFC phenomenon could be applied in data security protection in ink-free rewritable paper.
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Polymers
·
2024
·Vol. 16
·期 9
·1188
·
IF 4.7
Heming Li,Xinming Wang,Ziyang Ding,Weiguo Gao,Yan Liu,Ke Ma,Zhizhi Hu,Yongqi Wang
Polymer materials with a low dielectric constant and low dielectric loss have the potential to be applied to high-frequency signal transmissions, such as mobile phone antennas and millimeter wave radars. Two types of diamines, 4,4′-diamino-p-tetraphenyl (DPT) and crown ether diamine (CED), were prepared for ternary copolymerization with BPDA in this study. Cross-links with molecular chains were formed, increasing molecular chain distance by utilizing rings of CED. The MPI films exhibit a good thermal performance with the increase in CED addition, with Tg > 380 °C and CTE from −4 × 10−6K−1to 5 × 10−6K−1. The Young’s modulus can reach 8.6 GPa, and the tensile strength is above 200 MPa when 5% and 7% CED are introduced. These MPI films exhibit good mechanical performances. The dielectric constant of PI−10% film can go as low as 3.17. Meanwhile, the relationship between dielectric properties and molecular structure has been demonstrated by Molecular Simulation (MS). PI molecules are separated by low dielectric groups, resulting in a decrease in the dielectric constant.
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POLYMER BULLETIN
·
2017
·Vol. 74
·期 9
·3689-3705
·
IF 1.43
Wang Jun,Wang Yuru,Song Lei,Wang Hua,Wang Jiaming,Li Cuiqin
A C 12 -naphthylamine antioxidant (3,3′-(dodecylazanediyl)bis( N -(4-(naphthalen-2-ylamino)phenyl) propanamide)) was successfully synthesized via Michael addition and amidation reactions. The chemical structure was analyzed by Fourier transform infrared spectra (FTIR), 1 H-nuclear magnetic resonance spectroscopy ( 1 H NMR), and liquid chromatography–mass spectrometry (LC–MS). Thermal stability of C 12 -naphthylamine antioxidant was also examined by differential scanning calorimetry (DSC). The scavenging capacity of antioxidants was investigated by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. The efficiency of the antioxidants in thermo-oxidative stabilization of polyethylene (PE) was determined by DSC, FTIR, and tensile testing machine. The results showed that the inhibition percentage of the C 12 -naphthylamine antioxidant was 57.09, the oxidation induction time (OIT) was 157.83 min, and the carbonyl index (CI) was 0.25. In addition, the C 12 -naphthylamine antioxidant had a better antioxidant efficiency in both scavenging test and thermo-oxidative test compared with N -phenyl-2-naphthylamine and N , N ′-di-2-naphthyl-p-phenylenediamine. The result for migration of antioxidants from PE indicated that migration content of C 12 -naphthylamine antioxidant was small.
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