JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 4
·1-13
·
IF 2.426
Guo Yongliang,Cui Jinfeng,Guo Junhong,Zhang Haojun,Wang Lurong,Yang Baoping
Polystyrene (PS) with great flame retardancy has been achieved by addition of polyhedral oligomeric silsesquioxane (POSS). However, the POSS/PS composite showed easy-ignition behavior leading to fire hazard exposed. Aiming to prolong time to ignition (TTI) and improve flame retardancy simultaneously, using non-flammable modifier to decorate POSS is a facile method. Here, two kinds of POSS hybrids (POSS-ILs), denoted as POSS-EVIM and POSS-VIPSP, were synthesized by free radical copolymerization between vinyl POSS and two kinds of ionic liquid, commercial [EVIm]BF 4 and Brønsted ionic liquid, respectively. The polystyrene-based composites (POSS-ILs/PS) were prepared by incorporated POSS-ILs into polystyrene. The results of thermal gravimetric analysis test evidenced that both POSS-ILs increased char yield and decreased decomposed rate of composites. Compared with neat PS, the TTI of POSS-ILs/PS was prolonged by 26 s and 21 s, and meanwhile, the fire hazard was decreased due to reduction of peak value of heat release rate (PHRR) and smoke release rate (PSPR) in cone calorimeter test. Scanning electron microscope observed compact residue of POSS-EVIM/PS and honeycombed residual morphology of POSS-VIPSP/PS, and additionally, both of these residual char possessed higher degree of graphitization than that of PS and POSS/PS in Raman spectrum, suggesting good physical barrier for matrix from heat and oxygen. Besides, the flexural strength of both POSS-ILs/PS composites were increased compared with neat PS. Taking the results above mentioned, POSS modified by ionic liquid can be a decent candidate to prolong time to ignition, simultaneously improve fire safety and mechanical properties for polymeric materials.
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Nanoscale
·
2020
·Vol. 12
·期 17
·9569-9580
·
IF 6.895
Ting Chen,Yanqiao Xu,Zhixiang Xie,Weihui Jiang,Lianjun Wang,Wan Jiang
CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) are competitive fluorescent materials for lighting and displays owing to their excellent photophysical properties. However, the stability and optoelectronic performance of the perovskite NCs are severely limited by the highly dynamic binding feature of the present ligand strategy. Herein, a facile approach was employed to synthesize CsPbBr3 NCs with the assistance of the ionic liquid (IL) 1-butyl-3-methylimidazolium bromide ([Bmim]Br). By strictly controlling the addition dose of [Bmim]Br (nIL/nPb = 0.125) into the reaction precursor, it is possible to obtain the desired cube-shaped and monodisperse CsPbBr3 NCs with simultaneous enhancement of the storage and irradiation stability as well as photoluminescence quantum yields (PLQYs, ∼91%). Stability tests show that the emission intensity of the parent CsPbBr3 NCs drops to 50% of its initial emission intensity after storage under an open atmosphere for 91 days, while the sample prepared with the assistance of [Bmim]Br can maintain 82% of the PL intensity. Meanwhile, the modified CsPbBr3 NCs also present superior photo-stability, and still maintain 81% of the original PL intensity after continuous illumination under an ultraviolet lamp for 24 h, but the intensity of the parent CsPbBr3 NCs reduces to 35% of the original intensity. Through the morphology, composition, and luminescence kinetics evolution of CsPbBr3 NCs, these benefits were attributed to the modulation by [Bmim]Br, which could effectively provide Br ions for the formation and growth of NCs, resulting in the reduction of surface traps. Moreover, [Bmim]Br exhibited strong interactions with NCs, and the deprotonation of oleic acid (OA) was inhibited, resulting in the effective passivation of surface defects. Finally, CsPbX3 NCs with different compositions were obtained via a facile anion exchange reaction, leading to the tunable emission in the range of 462–665 nm and a wide colour gamut (129.65% NTSC standard). This work opens a new avenue for modulating the surface properties of CsPbX3 NCs, which will create opportunities for their application in the photoelectric field.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yin Hu,Ji Pan,Qi Li,Yongyuan Ren,Haojun Qi,Jiangna Guo,Zhe Sun,Feng Yan
Lithium–sulfur (Li-S) batteries with exceptional theoretical capacities and environmentally friendly characteristics have been investigated as next-generation energy storage devices. However, the dissolution and diffusion of polysulfide result in a rapid capacity degeneration, which hinders their practical application. Here, poly(ionic liquid) (PIL)-based core–shell structured nanofibers, poly(pyrrole)@poly(ionic liquid)–polyacrylonitrile (PPy@PIL–PAN), were prepared via electrospinning and followed by a surface polymerization of pyrrole. The as-prepared PPy@PIL–PAN nanofibers were implemented as a functional interlayer for Li-S batteries, and it is found that the cationic poly(ionic liquid) framework could selectively adsorb polysulfide species in the electrolytes, contributing to effective shuttle inhibition as well as stable sulfur electrochemistry. Moreover, this work sheds light on an efficient approach to improving the performance of Li-S batteries by using PIL-based functional interlayers.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Tian Yao,Kaifeng Du
Four novel organic magnetic ionic liquids were synthesized and characterized. A new method of in-situ magnetic ionic liquid dispersive liquid-liquid microextraction coupled with HPLC was established to simultaneously separate, preconcentrate and determine trace amount of sulfonamides in milk samples for the first time. In this work, extraction procedure was free of volatile organic solvent. Extraction equilibrium was immediately achieved without further operation such as vortex shaking. Magnetic separation of two phases was effectively achieved by applying external magnetic field without need of centrifugation. Furthermore, only a very small amount of inorganic salts were generated. This is the first time to realize all these advantages in an analytical method. Under the optimal conditions, satisfactory enrichment factors, precisions, linear range and low limit of detection and quantitation were acquired. The validated method was successfully applied in the simultaneous analysis of 5 sulfonamides in real milk samples.
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FUEL
·
2020
·
IF 5.578
Zhaoyang Qi,Ting Qiu,Hongxing Wang,Changshen Ye
Ionic Liquids (IL) has been recently immobilized into the pores of metal-organic framework materials (MOFs) to prepare heterogeneous catalyst. However, the IL@MOFs composites are generally prepared by impregnation method, which is unstable in polar solvents. So, we design a new strategy to immobilize IL, and a novel Fenton-like catalyst [mim(CH 2 ) 3 COO]FeCl 4 @UiO-66 has been prepared based on the post-synthetic ligand exchange (PSLE) between MOFs and monocarboxylic functional IL. The [mim(CH 2 ) 3 COO]FeCl 4 @UiO-66 was exploited to act as an efficient heterogeneous catalyst for dibenzothiophene (DBT) oxidation in a biphasic system using H 2 O 2 as the oxidant. Based on optimal conditions, the DBT removal efficiency reached up to 99.1%. Moreover, the heterogeneous catalyst had a good thermal and chemical stability, and the DBT removal efficiency still exhibited over 95% after 6 recycle runs. It is worth noting that the high DBT removal efficiency could be attributed to the synergistic effect between adsorptive and oxidative desulfurization, where [mim(CH 2 ) 3 COO]FeCl 4 @UiO-66 is both an adsorbent and a catalyst.
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Molecular Catalysis
·
2020
·
IF 3.687
Hongbing Song,Yule Liu,Yongjie Wang,Bingxiao Feng,Xin Jin,Tingting Huang,Meng Xiao,Hengjun Gai
In this study, a series of hypercrosslinked poly(ionic liquid)s (HCPILs) formed from imidazolium tetrachloropalladate were successfully fabricated for selective hydrogenation of phenylacetylene. Its textural properties can be tuned by the different molar ratios of reactants, thereby adjusting its active sites. The synthetic HCPILs were analyzed using various characterization techniques. Due to the constraint of the microporous structure and the charge effect of ionic liquid moieties in the HCPILs, palladium nanoparticles generated from HCPILs were reduced in situ during hydrogenation of phenylacetylene and highly dispersed. Amongst which catalyst a-4 with the largest pore-volume performed the best selectivity (97.3 %) to styrene at 96 % phenylacetylene conversion under the conditions of 308 K and 1 atm H 2 pressure. Furthermore, the activity and selectivity of the catalyst did not change considerably in solvents with different polarities. Even after repeated the catalytic experiments for five times, the catalyst displayed no significant loss for activity and selectivity. This work shows industrial application potential and a developing direction in the selective hydrogenation process.
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MATERIALS & DESIGN
·
2020
·
IF 6.289
Hong Ruan,Qiu Zhang,Weiqiang Liao,Yuqi Li,Xiaohua Huang,Xu Xu,Shaorong Lu
Developing self-lubricating composites with excellent tribological, thermal, and mechanical properties is a key aspect to solving the wear of materials . Herein, ionic liquid functionalized graphene (ILFG) were prepared by a π-π stacking interface design strategy. Then, a range of ILFG was filled into the polyimide (PI) matrix to prepare ILFG/PI composites (IGPI), and their tribological properties were investigated with a plate-on-ring apparatus under dry sliding conditions. When the content of ILFG was 0.4 wt%, the friction coefficient and specific wear rate of IGPI decreased by 38.2% and 25% compared to pure PI, respectively. A synergistic lubrication mechanism of ionic liquid (IL) and graphene was proposed for the formation of tribofilm under dry sliding. In addition, the mechanical and thermal properties of IGPI were also significantly improved by the synergy of IL and graphene. When the content of ILFG was 0.4 wt%, the tensile strength and modulus of IGPI composites increased by 51.9% and 56.5% relative to pure PI, respectively. The decomposition temperature of 5% weight loss (T 5% ) of IGPI with 0.4 wt% ILFG could reach 581.3 °C, an increase of 52.6 °C compared to that of PI, and the glass transition temperature improved by 14 °C.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Zhaomin Wang,Fanming Zeng,Dongyu Zhang,Xinyu Wang,Weiling Yang,Yong Cheng,Chun Li,Limin Wang
Antimony anode has attracted increasing attention with its suitable voltage platform and high theoretical capacity. Nonetheless, its actual application is largely hindered by the capacity loss due to the volume effect during the cyclic process. Herein, A novel polyhedral structure nitrogen and carbon doped Sb/Sb 2 O 3 (Sb/Sb 2 O 3 -NC) nanoparticles are designed via a liquid phase reaction approach followed by a thermal treatment process. The nanocomposite anode used for lithium-ion batteries (LIBs) delivers a reversible specific capacity as high as 460 mAh g −1 after 100 cycles at 2 A g −1 and excellent rate performance of 353 mAh g −1 at 10 A g −1 . In addition, at a current density of 500 mA g −1 , Sb/Sb 2 O 3 -NC exhibits a capacity of 318 mAh g −1 after 100 cycles and excellent rate performance of 183 mAh g −1 at 2 A g −1 for sodium-ion batteries (SIBs). The results suggest that the polyhedral Sb/Sb 2 O 3 -NC could be a potential candidate as anode material for LIBs and SIBs.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2021
·Vol. 247
·期 11
·2729-2738
·
IF 2.998
Chang Rui,Ma Chong,Yu Chao,Zhang Qiang,Li Yanxin,You Jinmao,Zhang Shijuan
Estrogens in milk samples were extracted by a new ionic liquid (IL)-modified covalent organic framework (COF), and then analyzed by stable isotope labeling (SIL) method using dansyl chloride (DNS-Cl) and d 6 -dansyl chloride (d 6 -DNS-Cl) as SIL agents. The IL-modified COF (TpPa-Ct@Mi) was synthesized by chemically bonding methylimidazole on to the surface of normal COF to make full use of the high surface area and big conjugated structure of COF, and the abundant charge of IL, which are of crucial importance for adsorption. The synthesized COF can form π–π interactions and hydrophobic effect with estrogens, while the IL can form electrostatic interactions with the analytes. It was applied to the dispersive solid-phase extraction (DSPE) of estrogens in milk samples. The extracted estrogen samples were heavy labeled by d 6 -DNS-Cl, and then mixed with the light labeled standard. Samples and standards were mixed and analyzed in a single run, and thus the matrix effect was greatly minimized. The optimized extraction conditions were adsorbent amount, 20 mg; desorption solvent and volume of desorption solvent, 2 mL acetonitrile; NaCl concentration, 0 g/L; sample pH 7. The limits of detection were in the range of 9–13 ng/L, and the limits of quantitation were in the range of 29–40 ng/L. Recoveries and matrix effect were in the range of 89.6–95.5% and 96.1–98.9%, respectively, with relative standard deviations of less than 6.2%.
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ACS Omega
·
2021
·
IF 3.512
Rongrong Wang,Xirong Huang
The hydrophobic ionic liquid [C8mim][PF6] (1-octyl-3-methylimidazolium hexafluorophosphate)-based bicontinuous microemulsion stabilized by the anionic surfactant [C4mim][AOT] (1-butyl-3-methylimidazolium bis(2-ethylhexyl) sulfosuccinate) was first tried as a medium for horseradish peroxidase (HRP)-triggered oxidative polymerization of aniline. The effects of the mass ratio of [C8mim][PF6]-to-water (α), the mass fraction of [C4mim][AOT] in the total mixture (γ), and temperature (T) on the enzymatic polymerization were investigated using UV–vis–NIR absorption, electron spin resonance, and small-angle X-ray scattering spectroscopy techniques. The bicontinuous microemulsion is demonstrated to play a template role in the biosynthesis of polyaniline (PANI). The conductivity of the resulting PANI depends on the microemulsion microstructure and the microstructure- and T-dependent catalytic properties of the solubilized HRP. With the increase in α, the conductivity of the synthesized PANI decreases due to the increase in the template curvature (decrease of the microdomain size) and the decrease in the activity and stability of HRP. Compared with α, γ has little effect on the microdomain size of the template; so, the γ-dependent change in the conductivity of PANI is mainly caused by the changes of the microstructure-dependent activity and stability of HRP. Over the range of 20–35 °C, T has little effect on the microdomain size, but it greatly changes the activity and stability of HRP. With the increase in T, the activity of HRP increases steadily, but its stability decreases significantly, which should be one of the reasons why the conductivity of PANI decreases with increasing T. In conclusion, lower values of α, γ, and T are favorable for the biosynthesis of conductive PANI. The present study not only deepens the insight into the role of the template in the process of PANI synthesis, but also opens up a green new way for the biosynthesis of the conducting polymer.
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MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Jinkai Lu,Shaoqing Liu,Aihao Xu,Lijian Jin,Hanwen Chi,Ying Li,Bin Li,Lihui Dong,Minguang Fan
3–5 μm ionic liquid polymer microspheres (TBB-Bpy) were synthesized with bipyridine and tetrabromotoluene through alkylation reaction and simple solvothermal method, and then a variety of alcohol amine, imidazole or pyridine was grafted onto the TBB-Bpy. And the catalytic activity of different supported ionic liquids was explored. After comparative experiments, ionic liquid polymer microspheres grafted with pyridine (TB-Py) were the most active catalysts for the synthesis of cyclic carbonates from epoxides and CO 2 . Morphology, structure, and stability of catalysts was explored by a variety of characterization methods (FT-IR, SEM, XPS, EA , and TGA). And various factors that affect the catalytic efficiency of TB-Py be researched, such as reaction temperature, pressure, catalyst dosage and reaction time. The selectivity and yield be analysis and detection by gas chromatography (GC-2010 Plus), under the reaction condition of 0.15 g catalyst, 80 °C, CO 2 pressure of 1 Mpa, and 24 h, the yield of propylene carbonate can reach 96.52%. After 5 times of repeated use, the yield still has more than 90%, and the selectivity was always above 99%. It was easy to separate and reused after the reaction, and a reasonable reaction mechanism was proposed.
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Nanoscale
·
2021
·Vol. 13
·期 31
·13285-13293
·
IF 7.79
Quanzhou Du,Yuhua Zhao,Kelei Zhuo,Yujuan Chen,Lifang Yang,Chunfeng Wang,Jianji Wang
Supercapacitors, as one of the most promising energy storage devices, have high power density but low energy density. An appropriate collocation of porous carbon electrodes and ionic liquid electrolytes can improve notably the performance of supercapacitors. Herein, we report a pre-assembly strategy to prepare three-dimensional (3D) hierarchical porous carbons (HPCs) as the electrode materials for supercapacitors. Three long-chain hydrophilic polymers polyacrylamide (PAM)/gelatin/F127 in water form 3D frameworks by pre-assembly and further form a hydrogel. Then the hydrogel is freeze-dried, carbonized, and etched to form 3D hierarchical porous carbons. The effects of pore volume, pore size, and ratio of mesopores to micropores on the performance of ionic liquid-based supercapacitors are investigated. The porous structure of the prepared HPCs can well match EMIMBF4. Therefore, HPCs as electrode materials for supercapacitors exhibit an excellent specific capacity of 216.5 F g−1 at 1 A g−1, and the as-assembled symmetric supercapacitor delivers a superior energy density of 108.6 W h kg−1 at a power density of 961.1 W kg−1. Meanwhile, the symmetric supercapacitor maintains 84.4% of its initial capacitance after 10 000 cycles at 3 A g−1. This work provides a guide for developing new porous carbon materials for supercapacitors with a high energy density.
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危险品化学品经营许可证（带存储）