EUROPEAN POLYMER JOURNAL
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2020
·
IF 3.862
Faliang Luo,Juntao Ren,Chunyu Li,Yanming Hu,Guangyuan Zhou
A styrene derivative, 4-N,N-dimethylaminostyrene (MAS), serving as both catalyst and monomer was exploited in reversible complexation mediated polymerization (RCMP). Radical trap experiment and UV–vis spectroscopy analysis revealed that MAS as a catalyst could abstract iodine from iodine-containing compound to generate propagating radical species. Kinetic studies demonstrated that the polymerization of styrene in the presence of MAS proceeded in a “living”/controlled manner, affording polymers with controlled molecular weights and narrow molecular weight distributions. The livingness of the obtained polymer was confirmed by chain extension. Determined by water contact angle measurement, incorporation of MAS into the polymer led to the enhancement of surface energy. Moreover, using α,ω-bis(2-iodo-2-phenylacetoxy)-end functionalized cis -1,4-polyisoprene as a macroinitiator which was synthesized through cross-metathesis of cis -1,4-polyisoprene with cis -1, 4-bis(2-iodo-2-phenylacetoxy)-2-butene, the polymerization of styrene in the presence of MAS also exhibited typical features of “living”/controlled radical polymerization to yield polystyrene-block-polyisoprene-block-polystyrene.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengmeng Zhu,Junbo Wang,Lei Hou,Yiwen Yuan,Lili Liu,Yaoqing Chu,Chunmei Huang
The design and syntheses of new birefringent crystals will be of great importance in commercial applications and materials science. A series of ultraviolet (UV) birefringent crystals, AX·(H2SeO3)n (A = K, Cs; X = Cl, Br; n = 1, 2), with large sizes up to 23 × 6 × 3 mm3, was successfully synthesized by simple aqueous solution method. These four compounds belong to three different space groups. Isomorphic KCl·(H2SeO3)2 and CsCl·(H2SeO3)2 crystallize in the P1¯ space group, while CsBr·(H2SeO3)2 and CsCl·H2SeO3 crystallize in the P21/m and P21/c space groups, respectively. They exhibit cocrystal structures composed of [2(H2SeO3)]∞ and [AX]∞ frameworks, ingeniously inheriting the large optical anisotropy of selenite and the wide band gap of alkali metal halide. And it proves that these compounds indeed possess large birefringence (0.1–0.17 at 532 nm) and short UV cutoff edges (227–239 nm), achieving a balance of optical properties. This research affords a simple and viable strategy for the design and syntheses of new UV birefringent crystals. Besides, it is also found that the n value and ionic size (A and X ions) have important influences on the crystal structures and optical properties of AX·(H2SeO3)n. And this will promote further understanding of the alkali metal halide selenite family.
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MACROMOLECULAR CHEMISTRY AND PHYSICS
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2020
·Vol. 221
·期 6
·1900557
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IF 2.335
Yiran Wang,Xianhong Zhang,Yuhong Ma,Dong Chen,Changwen Zhao,Wantai Yang
This study reports a step-growth click-polymerization of 1,4-benzenedimethane (BDMT) and diethylene glycol divinyl ether (DEGVE) with 4-( N,N -diphenylamino)-benzaldehyde (DPAB) as a photoredox catalyst under irradiation of visible light. DPAB exhibits a strong UV–vis absorption at 350 nm and a strong fluorescence emission at 480 nm in anisole. There is a strong fluorescence quenching between BDMT and DPAB. The molecular weight of the polythiolether can be controlled by reaction time and monomer feed ratios. More importantly, α,ω-dithiol and α,ω-divinyl telechelic polythiolether oligomers are successfully synthesized by simply changing the molar ratios of BDMT to DEGVE. 1 H NMR and MALDI-TOF MS spectra demonstrate that the oligomers have high end group fidelity. In addition, strong fluorescence is observed when the α,ω-dithiol terminated polythiolether adds with N -(1-pyrenyl) maleimide, indicating that the as-prepared polythiolether bears reactive thiol end groups. Furthermore, high molecular weight polythiolether are prepared by chain extension with reactive polythiolether oligomers as macro-monomers. For example, α,ω-divinyl oligomer ( M n = 2000 g mol −1 ) could further react with α,ω-dithiol oligomer ( M n = 2400 g mol −1 ) to form high molecular weight polythiolether ( M n = 6000 g mol −1 ).
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2013
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IF 0.807
Shaojian Lin,Wen He,Jianwu Lan,Ronghui Guo,Jiaojiao Shang,Si Chen
A series of new poly(ester-ether-imide)s (PEEIs) with potential low and high temperature application as elastomers were obtained by melting polycondensation of 1,4-butanediol (BD), dimethyl terephthalate (DMT), poly(tetramethylene glycol) (PTMG1000) and imide dihydric alcohol based on pyromellitic dianhydride (PMDA) and ethanolamine (EOA). The purity of imide dihydric alcohol was characterized by elemental analysis. The structures of imide dihydric alcohol and PEEIs were confirmed by FT-IR and 1H-NMR. The intrinsic viscosities, solubility, thermal properties, mechanical properties and low temperature elastic recovery of these polymers were investigated. The results show that the PEEIs have good solubility, and introduction of imide group endows the PEEIs with excellent thermal stability and good low temperature elastic recovery properties. Meanwhile, the mechanical properties of PEEIs are also improved.
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INORGANIC CHEMISTRY
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2015
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IF 4.762
Fugang Li,Yangang Bi,Wenyuan Zhao,Tonglai Zhang,Zunning Zhou,Li Yang
Nitrogen-rich energetic salts involving various cations (lithium, 1; ammonium, 2; hydrazinium, 3; hydroxylammonium, 4; guanidinium, 5; aminoguanidinium, 6; diaminoguanidinium, 7; and triaminoguanidinium, 8) based on nitrogen-rich anion [Zn(BTA)2(H2O)]2– (N% = 65.37, BTA = N,N-bis[1H-tetrazol-5-yl]amine anion) were synthesized with a simple method. The crystal structures of all compounds except 1, 2, and 6 were determined by single-crystal X-ray diffraction and fully characterized by elemental analysis and FT-IR spectroscopy. The thermal stabilities were investigated by differential scanning calorimetry (DSC). The DSC results show that all compounds exhibit high thermal stabilities (decomposition temperature >200 °C). Additionally, the heats of formation were calculated on the basis of the experimental constant-volume energies of combustion measured by using bomb calorimetry. Lastly, the sensitivities toward impact and friction were assessed according to Bundesamt für Materialforschung (BAM) standard methods.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zhuang Wang,Dongping Su,Ting Luo,Qiao Yu,Yiting Wang,Hang Zhou,Rui Li,Qing-Jiang Pan,Songdong Ding
High-purity thorium is essential for producing key radioactive nuclides, such as 233U and 225Ac. Currently, the primary challenge in preparing high-purity thorium is separating trace amounts of uranium and rare earth impurities from crude thorium products. To address this, an efficient NTAamide(n-Oct)@CG71M extraction resin was developed for isolating high-purity thorium in a nitric acid medium containing uranium and rare earth elements. Batch adsorption studies exhibit high selectivity and strong adsorbability for thorium over a relatively wide acidity range of 0.10–8.0 mol/L HNO3. The adsorption of thorium onto the resin conforms to pseudo-second-order kinetics and the Langmuir model, with a maximum Th(IV) adsorption capacity (qmax) of 79.9 mg/g. Thermodynamically, the process is exothermic and spontaneous, accompanied by an increase in the entropy. The NTAamide(n-Oct) extractant in the resin coordinates with Th(IV) via three oxygen atoms of the carbonyl groups and one tertiary amine nitrogen atom. Dynamic separation experiments confirmed that the NTAamide(n-Oct)@CG71M extraction resin can efficiently remove trace uranium impurities from commercial thorium nitrate reagents, yielding high-purity thorium nitrate (99.99%). Furthermore, the resin selectively separated thorium from simulated monazite HNO3 leach liquor with a 99.4% recovery rate and high-purity thorium (99.99%) while demonstrating good reusability. Overall, this efficient extraction resin provides reliable technical support for high-purity thorium nitrate preparation and shows significant application potential.
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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2026
·
IF 5.2
Fangxu Li,Qing Tang
To enhance the enrichment efficiency of copper oxide ores, calcium polysulfide (CaSx) in combination with potassium n-butoxypropyl xanthate (BPX) was applied for the sulfidization flotation of malachite in this study—marking the first reported use of this reagent system for such a purpose. Flotation experiments demonstrated that the CaSx-BPX system exhibited superior selectivity and separation performance for malachite relative to calcite and quartz, outperforming three reference systems: CaSx-Sodium isobutyl xanthate(IBX), Na 2 S-BPX, and Na 2 S-IBX. Under optimized conditions (pH = 7, CaSx dosage of 200 mg/L, and BPX dosage of 100 mg/L), the recovery of malachite, calcite, and quartz were 98.23%, 5.89%, and 2.35%, respectively. Zeta potential analyses showed a negative shift in the surface potential of malachite over the pH range of 7–12 after the addition of CaSx, followed by a further negative shift upon BPX adsorption. The XPS results further indicate that CaSx forms stable Cu(I/II)–S chelates on the malachite surface. Subsequently, the sulfided malachite chemically reacts with BPX to form C–S–Cu(I/II) chemical bonds. Contact angle measurements revealed that malachite undergoes a transition from hydrophilic to hydrophobic upon treatment with CaSx–BPX, whereas calcite and quartz retain their hydrophilic nature. This differential wettability provides a rational explanation for the high flotation selectivity achieved among the three minerals.
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产品关联
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高影响因子
Journal of Stroke & Cerebrovascular Diseases
·
2026
·
IF 2.1
Tao Ye,Xuandong Kong,Xinhuang Lv,Qiyao Li,Hangqi Jin,Mozi Chen,Jiaming Liu,Ming Zhao
Background Trimethylamine-N-oxide (TMAO), a metabolite produced by gut microbiota, has been linked to brain disease; however, its role in intracerebral hemorrhage (ICH) remains unclear. Methods Animal experiments were conducted to demonstrate the effects of TMAO on collagenase-induced rat models of ICH. Neurological function was evaluated using the modified neurological severity score (mNSS), and neuronal damage was assessed by NeuN staining. Microglial activation and pro-inflammatory cytokine expression were examined. To further investigate the mechanism of TMAO, we performed Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis on its predicted molecular targets. BV2 microglia were treated with TMAO to assess the levels of reactive oxygen species (ROS), cyclooxygenase-2 (COX-2), NOD-like receptor protein 3 (NLRP3), and caspase-1. Moreover, ICH rats were intragastrically treated with TMAO precursor L-carnitine (LC), and antibiotic cocktail treatment was used to deplete the gut microbiota, then assessed the effect. Results Our results showed that TMAO administration exacerbated neurological deficits and microglial-mediated neuroinflammation in ICH rats. NOD-like receptor signaling pathway was a key mechanism promoting ICH pathogenesis and confirmed that TMAO supplementation exacerbated microglial activation by regulating NLRP3 inflammasome activity in vitro . Moreover, gut microbiota depletion attenuated TMAO-induced activation of NLRP3 and the subsequent neuroinflammatory response in ICH. Conclusion Collectively, these findings showed that Microbial Metabolite TMAO contributes to ICH-induced neuroinflammation by activating the NLRP3 signaling pathway.
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产品关联
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2026
·
IF 1.4
Ziyan Wang
In recent years, zinc-ion hybrid capacitors (ZIHCs) have garnered significant interest owing to their advantages, including eco-friendliness, affordability, inherent safety, and straightforward assembly under ambient conditions. These devices integrate a capacitor-type electrode with a battery-type electrode, effectively merging the superior power output and extended cycle life of supercapacitors with the high energy storage capacity characteristic of zinc-ion batteries. Nevertheless, the limited availability of active sites for Zn2+ storage in carbon-based cathodes, coupled with poorly optimized pore structures that hinder ion transport, results in suboptimal electrochemical performance. Here, we propose a ZnCu-MOF derived N-doped ordered mesoporous carbon materials (ZnCu-MC). N-doping strategy could improve the hydrophilicity of the electrode materials, reducing interfacial contact resistance, while the porous structure enabled rapid Zn2+ migration, critical for ultra-high rate performance. Therefore, Zn//ZnCu-MC full cell realized high specific capacity of 170 F g−1 at 1 A g−1 and 92% capacity retention after 65000 cycles. This work not only provides a promising strategy to improve the Zn2+ storage capability of carbonaceous materials but also sheds lights on charge-storage mechanism and advanced electrode materials’ design for ZIHCs toward practical applications.
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高影响因子
FUEL
·
2026
·
IF 7.5
Guo Wenying,Huang Guilan,Yuan Ling,Zhang Wenxin,Xia Mingzhu
Recently, higher alkanols have attracted the attention of researchers because, compared with other widely studied lower alkanols (such as ethanol and methanol), they have higher energy density, higher cetane number, better mixing stability and lower hygroscopicity. In biodiesel, alkanols are often added to improve the combustion performance of diesel engines. The qualitative of alkanol components is particularly important for the quality control of biodiesel. A reliable analysis method is demanded to distinguish the various alkanols in biodiesel. This study employed diffusion-ordered nuclear magnetic resonance spectroscopy (DOSY NMR) to establish a quantitative relationship model between diffusion coefficients and molecular weights of n-alkanols in DMSO‑ d 6 . It is found that the deviation from theoretical molecular weight (ΔMW) of the external calibration curves (ECCs) using dimethyl sulfoxide (DMSO) (0.46–1.88) as internal standards can significantly reduce the MW error than the internal calibration curves (ICCs) (1.05–2.65). The calibration curve of ECCs shows excellent fitting degree (R 2 = 0.999) and effectively mitigates the impact of external variables: ΔMW remains within ±7 when the concentration ranges from 0.05 to 100 mg/mL or the temperature varies from 288 K to 308 K. Based on the molecular weight determined by this method, n-alkanols that differ by only one carbon atom could be distinguished accurately, and the method has been validated in actual biodiesel samples containing C 4 -C 8 n-alkanols.
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Desalination and Water Treatment
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2024
·
IF 1
Huiming Zeng,Liang Lv,Rui Fan,Yulin Wang,Xiaoli Shen,Jianjun Chen,Jianguang Li
Photocatalytic degradation by ultraviolet (UV)/TiO 2 combined with Fenton reagent was employed in treating high concentration n-propanol solution. The influence of the TiO 2 dosage, the concentration of ferrous ion, the integral H 2 O 2 dosage and the optimizing H 2 O 2 adding program were investigated by a series of batch experiments. The increasing injection of the hydrogen peroxide during the reaction will make the reaction rate constant (k 1 ) 6.9% higher than the average injection when the integral H 2 O 2 dosage is fixed. The optimized parameters of the combined process can be listed as follow: [Fe 2+ ] was 0.30 g/L, [TiO 2 ] was 0.08 g/L, and average [H 2 O 2 ]b was 3.85 g/L (which was divided into six different parts, and the increasing gradient was 5%). After 6 h degradation under the ultraviolet (UV) photocatalytic irradiation, more than 88% removal of n-propanol was observed. When the wastewater is treated with the combined process, the degradation of n-propanol can be taken as the pseudo-first order reaction. Based on the experimental data, a semi-empirical model for estimating the reaction rate constant k 1 in cylindrical reactor was built, which will help to investigate the effect of system parameters and support further engineering design.
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Energy Technology
·
2021
·Vol. 9
·期 12
·2100743
·
IF 3.631
Xin Hou,Penggang Ren,Zhong Dai,Zhengzheng Guo,Zengping Zhang,Aiyue Sun,Wenwei He,Fang Ren,Yanling Jin
Herein, nitrogen, oxygen codoped porous carbon nanofibers (CNFs) from corn residue-derived lignin are fabricated via the electrospinning method, followed by introduction of graphenes (GNs) via a simple “brush-coating and drying” process. The obtained GN-coated carbon nanofibers (CNFs@GNs) exhibit a 3D network architecture, abundance of heteroatoms, excellent electrical conductivity, high specific surface area (700.92 m 2 g −1 ), thus boosting the electrochemical performances. The CNFs@GNs electrode delivers a higher specific capacitance of 271.1 F g −1 than CNFs (200.3 F g −1 ) at 1 A g −1 . Furthermore, the assembled CNFs@GNs symmetric supercapacitor exhibits an energy density of 20.3 Wh kg −1 at the power density of 199.97 W kg −1 together with a high charge/discharge reversibility of 97.3% and Coulombic efficiency of 99.81% after 10 000 cycles. This “brush-coating and drying” strategy utilized here provides a convenient and efficient route for designing CNFs and GN composites and can be utilized in other active materials.
研究领域:
材料科学
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纳米科技
·
电化学
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能源存储
·
功能材料
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危险品化学品经营许可证（带存储）