POLYMER
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2014
·Vol. 55
·期 25
·6504-6512
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IF 3.766
Jiao-Jiao Yan,He-Lou Xie,Liang Weng,Shuang Yang,Hai-Liang Zhang
The fabrication of ordered structure is very important for the applications of ionic liquid crystalline polymers (ILCPs) or polymerized (ionic liquid crystal) (PILC). In this paper, we reported a facile approach to manipulate the ordered structure of ILCPs through adjusting the length of alkyl spacer. We designed and synthesized a series of ILCPs contained imidazolium , poly(2,5-bis{[ m -(4-butoxy-4′-imidazolium phenyl) m-alkyl] oxy carbonyl} styrene bis (fluoroborate) salts) (denoted as P 4-m −BF 4 , m represents the number of carbon in the alkyl spacers and m = 2, 4, 6, 10) via radical polymerization . Combined differential scanning calorimetry (DSC), polarized light microscopy (PLM), X-ray scattering, and two-dimensional wide-angle X-ray diffraction (2D WAXD), we found that the ordered structure of this ILCPs can transfer from smectic A phase (SmA) to hexagonal columnar ( Φ H ) phase with the increase of spacer. Furthermore, these results were confirmed by reconstructed relative electron density map using fast fourier transform algorithm (FFT). The result revealed that the increase of alkyl spacer would affect the interaction between ions and side chain, and induce the packing of the side chains. It was evident that the alkyl spacer played an important role in the constructing of ordered structure and offered a new method to fabricate different ordered structure of ILCPs.
研究领域:
高分子科学
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材料化学
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软物质物理
·
液晶
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离子液体
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2013
·
IF 0
Huabin Xing,Xu Zhao,Rulong Li,Qiwei Yang,Baogen Su,Zongbi Bao,Yiwen Yang,Qilong Ren
As green and designable solvents, ionic liquids (ILs), have great potential in the separation of olefins and paraffins. The introduction of functional groups into ILs enhances its separation selectivity for olefin to paraffin; however, the absorption capacities of such functionalized ILs obviously decrease due to the strong polarity of the functional group. In this work, we designed a symmetrical dual nitrile-functionalized IL 1,3-dibutyronitrile-imidazolium bis((trifluoromethyl)sulfonyl)imide ([(CP)2im][NTf2]) and determined the solubility of ethylene and ethane at 303.15 K in three ILs: nonfunctionalized 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Bmim][NTf2]), single-functionalized 1-butyronitrile-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide ([CPmim][NTf2]), and dual-functionalized [(CP)2im][NTf2]. The experimental results showed that enhanced separation selectivity for ethylene/ethane could be achieved in the symmetrical dual-functionalized [(CP)2im][NTf2] with only a slight reduction of absorption capacity. A COSMO-RS calculation was carried out to understand the underlying dissolution mechanism of ethylene and ethane in ILs and showed that the polarity of the IL and its misfit interaction with gases were the major factors in determining the solubilities of ethylene and ethane in it. In addition, a silver-containing IL was also tested because of its higher absorption capacity for olefins. It was found that the silver-containing IL was superior to any of the common ILs in the separation of ethylene/ethane, particularly [Bmim][NTf2]. A simple equilibrium model was used to describe the absorption of ethylene in the silver-containing IL.
研究领域:
化学工程
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分离科学
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绿色溶剂
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物理化学
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yanan Zhang,Fei Lu,Yang Yu,Long Su,Yanan Gao,Liqiang Zheng,Xinpei Gao
Ionic liquid (IL)/H 2 O mixtures with tunable lower critical solution temperature (LCST) behavior exhibit tantalizing prospect in the field of liquid-liquid phase separation and purification. Herein, different types of amphiphiles were evaluated for the facile regulation of IL ([P 4444 ][DMBS]) based aqueous biphasic systems (ABSs). Interestingly, the addition of zwitterionic 3-(1-dodecyl-3-imidazolio) propanesulfonate (DIPS) remarkably increases the phase separation temperature of IL aqueous solution, while the addition of anionic sodium dodecyl benzene sulfonate (SDBS) and dodecyl-benzenesulphonic acid (DBSA) results in decreasing of the phase separation temperature. The tunable phase separation temperature ranges from 10 to 90 °C, which almost cover the full usable temperature range of ABSs. The regulation mechanism of amphiphile additives on the LCST behavior of IL/H 2 O mixtures was investigated through isothermal titration calorimetry , 1 H NMR spectroscopy and molecular dynamics simulations . Briefly, the addition of zwitterionic DIPS increased LCST through electrostatic shielding effect, while the addition of anionic SDBS and DBSA decreased LCST through ion exchange effect. As a proof of concept, the amphiphile regulated ABSs were demonstrated to selectively separate aliphatic and aromatic amino acids .
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Shuang Zheng,Qiuxia Xu,Shaojuan Zeng,Guilin Li,Haiyan Jiang,Xueqi Sun,Xiangping Zhang
Ionic liquids (ILs) with low vapor pressure, tunable structures and good NH 3 affinity provide an inspiring way to efficiently capture NH 3 . However, the high viscosity of most ILs limited mass transfer, which incumbers their industrial applications. Besides, how to simultaneously achieve high selectivity, capacity and reversibility of NH 3 still face great challenge. Herein, four novel hydroxyl ammonium protic ILs (HAPILs), including methyldiethanolammonium trifluoromethanesulfonate ([MDEAH][CF 3 SO 3 ]), triethanolammonium trifluoromethanesulfonate ([TEAH][CF 3 SO 3 ]), dimethylethanolammonium trifluoromethanesulfonate ([DMEAH][CF 3 SO 3 ]) and diethylethanolammonium trifluoromethanesulfonate ([DEEAH][CF 3 SO 3 ]), with multiple hydrogen bonding donors that can interact with more over two NH 3 molecules were designed and synthesized, and were further supported onto porous molecular sieves to overcome the above problem. Among the prepared porous HAPIL composites, 50 wt% [TEAH][CF 3 SO 3 ]@MCM-41 showed the highest NH 3 /CO 2 selectivity of 62 under 313 K and 0.1 MPa compared with the state-of-the-art values, along with high capacity of 114.3 mgNH 3 /g-adsorbent. The excellent NH 3 adsorption performance was attributed to the synergistic interaction of mesoporous effect and multiple hydrogen bonding between NH 3 and HAPILs. Furthermore, the porous HAPIL composites exhibited great recyclability after six cycles, revealing great potentials in industrial application of efficient and reversible NH 3 separation.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Yilong Li,Zhiyong Li,Ruipeng Li,Huiyong Wang,Yang Zhao,Yuanchao Pei,Jianji Wang
The development and utilization of nuclear energy is one of the effective ways to reduce carbon emissions and achieve the goal of global carbon neutrality. However, it is inevitable to release radioactive pollutants, such as I 3 − , into the environment during the utilization of nuclear energy, and the efficient adsorption and storage of iodide ion remains a challenge. In this work, a series of ionic liquid (IL) hybrid metal–organic framework (MOF) materials have been developed by simple impregnation of hydrophobic ILs into nanopores of stable MOFs for high-efficient I 3 − absorption from water for the first time. It is found that the hybrid materal [C 2 mim][Tf 2 N]@UiO-67–30 % exhibits a record high I 3 − absorption capacity at room temperature (4.30 g·g −1 ), and the I 3 − absorption capacity of [C 2 mim][Tf 2 N] in UiO-67–5 % is 10 times that of the neat [C 2 mim][Tf 2 N]. The adsorption process can be well described by Freundlich model and pseudo-second-order model. Such superior I 3 − absorption capacity is mainly attributed to the multiple sites interaction between anion of the highly dispersed IL and I 3 − , although cation of the IL and benzene ring of MOF framework also have contribution for the adsorption.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 16
·e53747
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IF 3
Hongwei Zhang,Yanchao Zhang,Haixiang Gao,Wenfeng Zhou
Traditional formaldehyde resin adhesives can release harmful substances, which endanger human health and contribute to environmental pollution. The development of alternative high-performance, environmentally benign adhesives is therefore of great importance. In this study, we evaluate the effect of several additives on the properties and performance of soy protein isolate adhesive, a bio-based adhesive. Triglycidyl isocyanurate, a chemically cross-linker, 1,3-dimethyl imidazolium hexafluorophosphate ([MMIM]PF 6 ), a crystalline ionic compound, and borax, which is covalently reactive with hydroxyl groups, were added to soy protein isolate to build a dense network structure. The wet shear strength of the adhesive prepared with all additives was 109% greater than that of the unmodified soy protein isolate adhesive (1.34 vs. 0.64 MPa). This improvement is due to the synergistic enhancement of the bonding strength through covalent cross-linking and hydrogen-bonding interactions. In addition, the anti-fungal properties of the adhesive were significantly improved through the use of chemical additives. This work provides a new approach for the preparation of high-performance, antimicrobial, bio-based adhesives, which will be beneficial in the development of greener alternatives to commonplace chemicals.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Tianci Liu,Man He,Shuangjiang Feng,Yanmei Liu,Xian Zhang,Yongjuan Wang,Chunfeng Mao,Xiaohai Bu,Yuming Zhou
Surface with low energy plays an irreplaceable role in antifouling coatings, national defense and military industry. However, low-energy surface has poor surface stability, which leads to the difficulty of recovery and massive waste. Thus, it is urgent to exploit low surface free energy materials with excellent surface stability. In this work, a series of ionic liquid-reinforced polybenzoxazine/urethane (poly(DHB/PU)) films was prepared, the dihydroxybenzoxazine (DHB), stearyldiethanolamine (SDEA) and hydroxyl-terminated polydimethylsiloxane (HTPDMS) introduced into the molecular chains provide the films low-surface-energy properties. Then, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid (IL) were added into the poly(DHB/PU) system. The comprehensive properties of the modified films were further improved, including recoverability, outstanding thermal stability (10 % weight loss temperature ranged from 270.51 to 308.51 °C), solvent resistance and low surface free energy (average 20 mN/m). Besides, the dense hydrogen bonds formed between imidazolium groups in IL and carbamates are the critical factor for optimizations of compatibility and mechanical properties. The higher the content of IL, the better the compatibility, the better the mechanical properties (elastic modulus varied from 63.32 MPa to 124.57 MPa) and the lower the peel strength (<7.975 gf/in) of the films. The synthesized polymer has great potential in the application of recoverable adhesive tape substrate.
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高影响因子
LIQUID CRYSTALS
·
2023
·
IF 2.2
Zemin He,Ping Yu,Hao Ma,Zhun Guo,Dongxia Zhang,Huimin Zhang,Yuzhen Zhao,Zongcheng Miao,Dong Wang
In this work, we report a bifunctional dynamically colour-changing polymer-dispersed liquid crystals (PDLCs) for smart windows by doping a supporting electrolyte ionic liquid into the conventional PDLC system. The transmittance spectra were used to measure the electrically colour-changing properties of the system, while the electro-optical curves were employed to examine the electrically switchable performances. The SEM was used to observe the surface morphology of the polymer microstructure. The result obtained from this work suggested that such device could obtain four independent states under different electric fields. The initial state was opaque and colourless due to the randomly dispersed liquid crystal droplets. The transparent and colourless state was obtained as a result of reorientation of liquid crystal under alternative current (AC) electric field. The opaque and green state was achieved under direct current (DC) electric field owing to the oxidation reaction in the system. Besides, the transparent and green state was realised via applying DC and AC electric field simultaneously or in steps. The convenience and simplification of switching between the four states enable the system to provide some interesting applications for smart windows.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 23
·14477-14484
·
IF 4.036
Dong Fu,Xiaoru Gao,Jue Wang,Haijian Jiang,Mingming Zheng,Peng Li,Bo Huang,Kan Kan,Xiaochen Zhang
A novel series of picoline-based ionic liquid surfactants, N-alkyoxycarbonyl-3-picoline bromides [CnEmpy][Br] (n = 10, 12, 14), have been synthesized. The thermal stability, aggregation behavior and surface activity of the synthetic ionic liquid surfactants were investigated systematically though a series of methods, such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), tensiometry and conductivity. The thermodynamics of micellization of the ionic liquid surfactants solution were studied by using the conductivity method in the temperature range 278.15–318.15 K. The surface activity parameters and thermodynamics parameters were derived, respectively. The enthalpy–entropy compensation effect was further discussed by using relative thermodynamics parameters. It was found that the [CnEmpy][Br] have moderate surface activity, and their critical micelle concentration (CMC) decreased with the ester-functionalized chain length and exhibited a U-shape with temperature. The calculation results of the thermodynamic parameters showed that the micellization processes of [CnEmpy][Br] were spontaneous, endothermic at low temperature and exothermic at higher temperature.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Lili Xu,Renmin Liu,Zhaofang Li,Moju Li,Min Zhao,Yingjie Li,Guiyue Hou,Aifeng Li,Hongbo Suo
In this study, imidazolium-based ionic liquids (ILs) were used to modify carboxymethyl cellulose-coated Fe3O4 nanoparticles with graphene oxide deposition (ILs-MCMC/GO). The prepared composites were characterized and used to immobilize lipase. The prepared biocatalyst (PPL-ILs-MCMC/GO) exhibited higher activity, which was 3.55-fold that of free lipase and 1.41-fold that of immobilized lipase without IL (PPL-MCMC/GO). After reusing 10 times, the residual activity of PPL-ILs-MCMC/GO was 91.3%, which was higher than those of PPL-MCMC/GO (83.6%) and PPL-MCMC (73.6%). In addition, using kinetic analysis, we showed that the affinity between PPL-ILs-MCMC/GO and the substrate was improved. The secondary structures of free and immobilized lipase were analyzed to explain the mechanism by which the performance of PPL-ILs-MCMC/GO was improved. The introduction of imidazole-based IL was useful in improving the microenvironment of immobilized lipase. Furthermore, magnetic supports loaded with lipase could be recovered easily.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 3
·266
·
IF 4.501
Yue Gao,Qing-Bo Meng,Bao-Xin Wang,Yu Zhang,Hui Mao,Da-Wei Fang,Xi-Ming Song
Poly(ionic liquid)s nanofiber (PIL NF) membrane was derived from polyacrylonitrile by converting its cyano groups to imidazoline moieties via cyclization with ethylenediamine, followed by quaternization with 1-bromobutane. The novel PIL NF is further decorated with photocatalyst phosphotungstic acid PW12 via anion exchanging to give PW-PIL. The degradation rate of the novel supported photocatalyst towards methyl orange irradiated under visible light was found to be 98%. In addition, the nanofiber membrane morphology is beneficial for easy recycling, and 98% of original degradation rate was maintained after 5 cycles of photocatalysis degradation. This robust, efficient, and recyclable material offers a new approach for serving as catalyst supporter. The photocatalyst PW-PIL is reported for the first time. The inexpensive functional membrane is used to exploit the sun as a cheap and clean source of light.Keywords:poly(ionic liquid)s;polyacrylonitrile;nanofiber membrane;visible light photocatalyst
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高影响因子
POLYMER
·
2022
·
IF 4.432
Bingxiu Xue,Fang He,Qi Lei,Xiaopeng Zhao,Jianbo Yin
Backbone, pendant and cross-linked poly(ionic liquid) (PIL) particles with the same ion pair and similar ion number density have been prepared and the electro-responsive electrorheological (ER) effect of their suspensions in insulating carrier liquid has been comparably studied by rheology and dielectric spectroscopy . It has found that the ER effect of cross-linked PILs is strongest and that of backbone PILs is weakest. Dielectric spectrum analysis has showed that the difference of ER effect is mainly due to the difference in the ion leakage and effective interfacial polarization of PIL particles under electric fields. Although the backbone PILs have the largest interfacial polarization strength , its ion leakage conductance is also largest and this results in its weakest ER effect. The cross-linked PILs well restrains the ion leakage conductance and the ER effect is largely enhanced. The difference in ion leakage conductance and ER effect is further related to the difference of PIL matrix structure according to X-ray diffraction characterization. This study clarified the influence of matrix structure on ER effect and dielectric polarization of PILs and provided a guidance for the design of PIL ER materials.
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高影响因子
危险品化学品经营许可证（带存储）