ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Pei Yu Xu,Ke Zhou,Guang Lu Han,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
Two kinds of novel multiblock poly(arylene ether sulfone)s were synthesized via block copolycondensation of telechelic oligomers as a starting material for the preparation of anion-exchange membranes (AEMs). The as-synthesized copolymers have extremely similar main chains. The difference is that the benzylmethyl groups for one are located on the fluorene–sulfone segments and they are located on the isopropylidene–sulfone segments for the other. The benzylmethyl moieties served as precursors to cationic sites and were brominated using N-bromosuccinimide (NBS) and then quaternized with N,N,N′,N′-tetramethyl-1,6-diaminohexane (TMHDA). Controlled bromination and quaternization at specific positions of the benzylmethy-containing fluorene–sulfone segments and isopropylidene–sulfone segments can be achieved. 1H NMR spectroscopy, Fourier transform infrared spectroscopy, and gel permeation chromatography were used to characterize the as-synthesized copolymers. Distinct microphase separation in the as-prepared AEMs was observed using small-angle X-ray scattering and transmission electron microscopy. The AEM containing fluorene–sulfone segments (IEC = 1.89 meq·g–1) showed higher ionic conductivity and methanol permeability than that containing isopropylidene–sulfone segments (IEC = 2.03 meq·g–1). Moreover, the former showed better alkaline stability than the latter.
研究领域:
高分子科学
·
材料化学
·
膜技术
·
能源材料
·
燃料电池
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DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 6
·767
·
IF 4.7
Changhai Zhang,Ziyang Liu,Chao Tang,Tiandong Zhang,Yue Zhang,Yongquan Zhang,Qingguo Chi
With the policy tilt and increased investment in research and development in the world, new energy vehicle technology continues to progress and the drive motor power density continues to improve, which puts forward higher requirements for the comprehensive performance of the core insulating material enameled wire enamel for drive motors. Polyimide (PI) has excellent electrical insulation properties, and heat resistance is often used to drive the motor winding insulation. To further improve the corona resistance and insulating properties of PI wire enamel varnish, in this paper, firstly, fluorene groups with a rigid conjugated structure were introduced into the molecular chain of the PI film by molecular structure modulation, and then uniformly dispersed alumina nanoclusters (AOCs) were introduced into the PI matrix by using an in situ growth process to inhibit the migration of high-energy electrons. The quantum size effect of the alumina nanoclusters was exploited to synergistically enhance the suppression and scattering of energetic moving electrons by PI-based composite films. The results show that the breakdown field strength of the PI-based composite film (MPI/1.0 vol% AOC) reaches 672.2 kV/mm, and the corona resistance life reaches 7.9 min, which are, respectively, 1.55 and 2.19 times higher than those of the initial PI film. A PI-based composite film with excellent insulating and corona resistance properties was obtained.
研究领域:
材料科学
·
电气工程
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DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Zhiguo He,Xuejiao Han,Hui Xie,Zifeng Yan,Bing Guo,Youwei Yao
Near-infrared (NIR) conjugated polymer nanoparticles (CPNPs) possesses advantages for bioimaging because of their merits in low autofluorescence interference, good biocompatibility, large light extinction coefficient, improved photostability, and facile functionalization capability. Different from conventional post-polymerization methods for fabricating NIR CPNPs, like nanoprecipitation, emulsion and solvent evaporation/miniemulsion, and self-assembly, herein, an efficient one-pot strategy by in-situ miniemulsion polymerization is demonstrated to synthesize CPNPs for NIR fluorescence imaging of cancer cells. Via adjusting the donor-acceptor strength , the new CP, poly(fluorene- alt -6-(2-ethylhexyl)-[1,2,5]thiadiazole[3,4- f ]benzotriazole) ( PFTA ), show absorption and emission maximum at 648 nm and 730 nm, respectively, which is much more red-shifted than its counterpart, poly(fluorene- alt -benzo-2,1,3-thiadiazole) ( PFBT ). DFT calculation demonstrates that the repeating unit of PFTA has a smaller dihedral angel to 33.2° and much reduced energy gap to 2.46 eV, as compared to that of PFBT NPs. Importantly, through controlling surfactant concentrations from 40 g·L −1 to 2.5 g·L −1 during the miniemulsion polymerization, the particles size can be accordingly changed from even 88 to 210 nm. Furthermore, the particles show extinction coefficient of 2.82 × 10 4 M −1 ·cm −1 at 648 nm, photoluminescence quantum yields c.a. 2.4% and fluorescence lifetime c.a. 1.26 ns, respectively. Moreover, the PFTA NPs exhibit biocompatibility, good colloidal stability and bright fluorescence signals to clearly pinpoint breast cancer cells, with a trend that smaller NP size, higher cellular uptake. This work demonstrates the promise of miniemulsion polymerization as a facile method to fabricate NIR CPNPs for bioimaging.
研究领域:
生物学
·
医学
·
材料科学
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DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Yang Yang,Bo Jiang,Yingshuang Shang,Qinfei Xu,Junjie He,Xuefeng Li,Haibo Zhang
The limited diffusion and entanglement of the chains between beads cause pronounced anisotropy in the mechanical properties of 3D printed parts. Therefore, amorphous poly (aryl ether ketone) (aPAEK) containing fluorene groups with high intrinsic strength and good interfacial fusion is synthesized and employed to improve the interlayer adhesion of poly (ether ether ketone) (PEEK) parts. Herein, we designed an aPAEK with high intrinsic strength and good interfacial fusion with PEEK blends. The tensile strength of 30 mol% fluorene groups aPAEK was improved to 75 MPa, and the interlayer strength of 20 wt% blends was increased by 315 % compared to PEEK. Moreover, the selection of an appropriate molecular weight for aPAEK is crucial in maintaining the elevated tensile strength while promoting interlayer diffusion during the printing process. These results highlight a novel strategy for the design and development of blend polymers for interlayer reinforcement in 3D printing applications.
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产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2018
·Vol. 35
·期 4
·279-288
·
IF 1.547
Guanghui Wang,Yao Jiang,Suhang Hu,Yadan Guo
Phytoremediation may be used for remediation of cocontaminated soil with heavy metals and polycyclic aromatic hydrocarbons (PAHs). However, the low bioavailability of heavy metals and PAHs in soils may have adverse effects on the efficiency of phytoremediation; it is necessary to find an effective method for simultaneously improving bioavailability of PAHs and heavy metals in cocontaminated soils. In this study, a novel aspartic acid-β-cyclodextrin (ACD) was synthesized, the structural characteristics of ACD were confirmed by FT-IR spectroscopy, and the complexation of fluorene (Flu) and cadmium (Cd) with ACD was studied. Pot culture experiments were conducted to investigate effects of ACD on phytoremediation of soil cocontaminated with Flu and Cd. Results showed that ACD could enhance uptake of Flu and Cd in alfalfa (Medicago sativa L.), and removal percentages of Flu and Cd in planted soil with ACD increased from 45.78% and 25.62% to 66.96% and 34.88%, respectively. Biological activity of planted soils with ACD was obviously higher than that of planted soils without ACD, which resulted in improvement of phytoremediation efficiency. As a promising remediation strategy, ACD-assisted phytoremediation may be a feasible technology for simultaneous removal of PAHs and heavy metals in cocontaminated soils.
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Hongyu Lu,Chengxun Deng,Zhimin Yu,Dianya Zhang,Weiping Li,Jun Huang,Teng Bao,Xiaowei Liu
Plasma techniques to degrade pollutants are generally more efficient than conventional methods, but exist some problems such as high energy consumption, incomplete degradation of pollutants, and secondary pollution caused by highly toxic intermediates. In this study, the dielectric barrier discharge plasma (DBDP) combined with the Ti-based metal organic frameworks (MOFs) catalysts (P25/NH 2 -MIL-125(Ti)) was used to degrade fluorene in the soil. The synergistic treatment technique used in soil remediation can realize a green and promising treatment efficiency with relatively low energy consumption. Compared with DBDP system alone, the synergetic treatment system of DBDP and P25/NH 2 -MIL-125(Ti) considerably increased the degradation efficiency of fluorene in the soil to above 90% at 10 min, even with a relatively low discharge voltage (5 kV). The synergistic treatment system achieved 88.8% of fluorene mineralization at 60 min. Optical emission spectroscopy and electron paramagnetic resonance spectroscopy both showed that •OH and •O 2 − played an important role in the synergetic treatment system. Nine main intermediates were identified using gas chromatography-mass spectrometry and Fourier transform infrared analysis. The main degradation of fluorine in soil was caused by the electronic transition of the catalytic material excited by DBDP, and finally mineralized into CO 2 and H 2 O. The fluorene and its toxic intermediates were effectively removed. This study provides an insight for achieving high efficiency and environmentally friendly application perspective in soil remediation.
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产品关联
DOI
PubMed
高影响因子
THIN SOLID FILMS
·
2017
·
IF 1.879
Yi Chen,Bo Wang,Jinhai Huang,Lei Wang,Jianhua Su
Two host materials based on spiro[fluorene-9,8′-indolo[3,2,1- de ]acridine] derivatives were designed and synthesized by introducing the benzofuran/benzothiophene unit to the spiro [fluorene-9,8′-indolo[3,2,1- de ]acridine] unit. The two host materials exhibited high triplet energy level (> 2.65 eV) and the benzofuran-substituted derivative presented suitable glass transition temperature (> 130 °C). Their electrochemical and photo-physical properties were also determined. The green phosphorescent organic light-emitting diodes based on the two host materials obtained electroluminescence performances with external quantum efficiencies of 14.3 ± 0.1% and 11.9 ± 0.1%, respectively.
研究领域:
材料科学
·
有机电子学
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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
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DOI
高影响因子
SYNTHETIC METALS
·
2023
·
IF 4.4
Xinlei Yuan,Wei Tang,Xudong Liu,Hongji Jiang
2,4,6-Triphenyl-1,3,5-triazine, diphenylmethanone and triphenylphosphine oxide were introduced into the 9-position of one fluorene moiety to produce donor-acceptor vertically structured emitters DFTRZ , DFCO and DFPO . The T g of DFTRZ , DFCO and DFPO solid powder are 135 °C, 89 °C and 97 °C, and DFTRZ with the most rigid receptor of 2,4,6-triphenyl-1,3,5-triazine showed the highest thermal stability, whose T d reached 436 °C, far exceeding those of DFCO and DFPO . The absolute photoluminescence quantum yields of DFTRZ , DFCO and DFPO solid powders are 14.35%, 1.13% and 7.57%, and the molecular framework of DFTRZ is meaningful to enhance the absolute photoluminescence quantum yields of obtained emitters. The donor-acceptor vertical structures do not endow these emitters with expected thermally activated delayed fluorescence emission. Beside the local emission of fluorene-based dimers, DFTRZ exhibits additional intramolecular charge transfer emission in polar solvents. The unique polar-induced dual emission of DFTRZ in solvents deteriorates the emission purity of the obtained emitter, and this embarrassment can be eased by DFPO in some degree. However, the dual light emission of DFTRZ in some polar solvents is useful to be senser and produce white light emission in solution. The maximum luminance of devices with bis (2-methyldibenzo[ f , h ] quinoxaline) (acetylacetonate) iridium (III) doped in emitters DFTRZ , DFCO and DFPO is higher than those of 2,3,5,6-tetrakis[3,6-bis(1,1-dimethylethyl)− 9 H-carbazol-9-yl]benzonitrile doped devices, and the corresponding maximum luminance is 16050 cd·m −2 for DFTRZ , 4545 cd·m −2 for DFPO and 11025 cd·m −2 for DFCO . DFPO is the best host of blue light emitters for OLED applications in term of color purity.
研究领域:
材料科学
·
光电技术
·
有机电子学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Shuhui Zhang,Zhenhua Fu,Yixin Xu,Xin Zhao,Mingzhu Sun,Xizeng Feng
In vertebrates, the behavior of congenital sex differences between males and females is highly dependent on steroid signals and hormonal milieu. The presence of endocrine disrupting chemicals (EDCs) in the environment generally plays a similar role to sex hormones, so its interference with aquatic organism population stability can not be ignored and is worth studying. Fluorene-9-bisphenol (BHPF) has been clarified as an endocrine disruptor on organisms by several studies but its mechanism in perturbation of courtship behavior of female zebrafish is not clear. Here, we proposed an automated multi-zebrafish tracking method quantifying the courtship process and reported that zebrafish females exposed to BHPF, are not receptive to males but rather court females, and lose normal ovarian function with an altered sex steroid milieu. Our results showed that BHPF damaged 17β-estradiol synthesis by down-regulation of sox3 and cyp19a1a , linking apoptosis with ovary development and female fecundity. The down-regulated expression of estrogen signaling through an estrogen receptor, esr2b , caused the induction of masculinization of female courtship behavior and sexual preference in zebrafish females after BHPF treatment. This process might be mediated by inhibiting the transcription of a neuropeptide B ( npb) in the brain. Our study reveals that the estrogen signaling pathway may play an important role in classical courtship behavior and sexual preference of zebrafish. This study provided evidence that anti-estrogenic chemical exposure caused adverse effects on the regulation of the brain-gonad-estrogen axis of aquatic organisms, which should be of concern and highlighted the importance of controlling environmental contamination.
研究领域:
环境科学
·
内分泌学
·
水生生物学
·
行为生态学
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DOI
PubMed
高影响因子
International Journal of Polymer Science
·
2022
·Vol. 2022
·期 1
·9255159
·
IF 2.973
Xiaozhou Zhang,Yang Liu,Xin Li,Xin Liu,Xigao Jian,Jinyan Wang
Polycarbonate is an attractive transparent plastic with high mechanical/thermal properties. A family of copolycarbonates of bisphenol-A (BPA), 9, 9-bis (4-hydroxyphenyl) fluorene (BHPF), and diphenyl carbonate (DPC) were prepared by a transesterification polymerization. The weight-average molecular weight of the polycarbonates ranges from 65,000 to 107,000 g/mol; the copolycarbonates showed T g and T d −5 % from 63-70°C and 100-105°C higher than the control, respectively. Meanwhile, the processing properties of polycarbonate remain unchanged. These properties endow the polymers with potential for use as high-temperature resistance materials.
研究领域:
高分子科学
·
材料工程
·
聚合物热性能
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Yue Zhang,Xi Li,Yang Sun,Jiahui Liu,Peiyuan Zhang,Fan Yang,Yongfeng Li
The development of anion exchange membranes (AEMs) that simultaneously exhibit high ionic conductivity, robust mechanical strength, and excellent alkaline stability remains a critical challenge for the advancement of anion exchange membrane water electrolysis (AEMWE). Herein, we report a series of poly (fluorene-co-aryl piperidinium) AEMs (QPFCP-x-y), incorporating 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) as a branching agent and 9,9-dimethylfluorene (FLN) as a rigid co-monomer. The unique structural features of CBP direct polymer chain extension in multiple dimensions, reduce chain packing, and enhance mechanical toughness. Concurrently, the rigid FLN units effectively promote microphase separation, facilitating the aggregation of hydrophilic piperidinium groups and promoting the formation of well-defined microphase-separated ion-conducting channels. The optimized membrane achieves a high hydroxide conductivity of 161.32 mS cm −1 at 80 °C, representing an approximately 18% improvement over its FLN-free counterpart. Furthermore, the membrane demonstrates outstanding alkaline stability, retaining 86.48% of its initial conductivity after 1500 h of immersion in 3 M KOH at 80 °C. An AEMWE single cell employing the QPFCP-3-10 membrane delivers a high current density of 1.83 A cm −2 at 2.2 V in 1 M KOH at 60 °C, outperforming a commercial FAA-3-50 membrane.
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DOI
高影响因子
危险品化学品经营许可证（带存储）