Polymeric ionic liquids based on ether functionalized ammoniums and perfluorinated sulfonimides
摘要:
A new family of polymeric ionic liquids (PILs) based on alkyl and alkyl ether substituted ammoniums and perfluorinated sulfonimides (i.e., bis(fluorosulfonyl)imide (FSI-), and bis(trifluoromethanesulfonyl)imide (TFSI-)) have been synthesized by polymerization of the corresponding ionic liquid monomers (ILMs). Their structures and compositions have been characterized by H-1 and F-19 NMR, FTIR and viscosity-average molecular weight (M-v). The physicochemical properties of both the ILMs and the PILs have been studied in terms of thermal stability, phase transition, and ionic conductivity. All the prepared ILMs and PILs reveal excellent thermal stabilities to greater than 250 degrees C. The PILs containing alkyl ether side unit show significant decrease in glass transition temperature (T-g), the values of T-g of the alkyl ether based-PILs are all significantly lower by 10-77 degrees C in magnitude than those of the corresponding alkyl based ones. The ionic conductivity of alkyl ether based-PILs in the best case increases up to 4.0 x 10(-6) S cm(-1) at 30 degrees C, and reaches 7.6 x 10(-5) S cm(-1) at 60 degrees C, and outperform their ammonium counterparts with alkyl side chain that were synthesized as references. (C) 2014 Elsevier Ltd. All rights reserved.
聚合物离子液体膜 (PILM) 通过光引发聚合 DMAEMA 基离子液体 (IL) 和共聚单体将 CO 2转化为环状碳酸酯而制备。研究了官能团和阴离子的影响,以找到最佳的离子液体单体。基于 [DMAEMA-EtOH]Br 的 PILM 表现出最高的碳酸丙酯 (PC) 产率 (98%),接近 [DMAEMA-EtOH]Br 单体的产率。此外,PILMs可以催化气态环氧丙烷(PO)和CO 2转化为 PC 的 PO 转化率为 87.3%,而纯聚合离子液体的 PO 转化率仅为气态 PO 的 3.1%。优异的催化活性可归因于 PILM 的高活性催化位点和出色的溶胀能力。干燥的 PILM 可以吸收 PO 蒸气并溶胀成具有丰富孔隙的膜,其中含有丰富的活性位点,可有效地将 PO 和 CO 2催化为 PC。
Effects of interaction between a polycation and a nonionic polymer on their cross-assembly into mixed micelles
作者:Xinyuan Wan、Yi Zhang、Ya Deng、Qin Zhang、Jiehua Li、Kunjie Wang、Jianshu Li、Hong Tan、Qiang Fu
DOI:10.1039/c5sm00380f
日期:——
length in quaternary ammoniumsalts, and the alkyl chain length also influences the distribution and the alkyl chain orientation of quaternary ammoniumsalts on mixed micelle surfaces. In addition, cytotoxicity of these mixed micelles can be markedly reduced by PPEG compared with their corresponding PQAs, but their good antibacterial activities are still maintained to a certain degree, as evaluated
catalysts, polymericionic liquids as heterogeneous catalysts are tailored for the transformation of CO2 into cycliccarbonates. Herein, six types of self-polymerized polymericionic liquids are successfully synthesized by changing the substitutions. Amongst those catalysts, hydroxyl-rich polymericionic liquids, especially P(DMAEMA-EtOH)Br, exhibit the highest conversion (96%) to propyl carbonate, which
Polymericionic liquid membranes (PILMs) were prepared by photo-initiated polymerization of DMAEMA-based ionic liquids (ILs) and co-monomers for the conversion of CO2 into cyclic carbonates. The influences of functional groups and anions were investigated to find the optimal ionic liquid monomer. The PILM based on [DMAEMA-EtOH]Br exhibited the highest propyl carbonate (PC) yield (98%), which was close
聚合物离子液体膜 (PILM) 通过光引发聚合 DMAEMA 基离子液体 (IL) 和共聚单体将 CO 2转化为环状碳酸酯而制备。研究了官能团和阴离子的影响,以找到最佳的离子液体单体。基于 [DMAEMA-EtOH]Br 的 PILM 表现出最高的碳酸丙酯 (PC) 产率 (98%),接近 [DMAEMA-EtOH]Br 单体的产率。此外,PILMs可以催化气态环氧丙烷(PO)和CO 2转化为 PC 的 PO 转化率为 87.3%,而纯聚合离子液体的 PO 转化率仅为气态 PO 的 3.1%。优异的催化活性可归因于 PILM 的高活性催化位点和出色的溶胀能力。干燥的 PILM 可以吸收 PO 蒸气并溶胀成具有丰富孔隙的膜,其中含有丰富的活性位点,可有效地将 PO 和 CO 2催化为 PC。
This analyte concentration measuring method including:
preparing a mixed solution by mixing a sample solution containing an analyte, with a solution containing aggregation-induced emission fluorescent material-containing particles that have a binding partner which binds with the analyte and that agglutinate and fluoresce when the analyte binds to the binding partner;
measuring the fluorescence intensity generated from the aggregation-induced emission fluorescent material-containing particles in the mixed solution; and
comparing a fluorescence intensity calibration curve for analyte concentration with the fluorescence intensity, and associating the fluorescence intensity with the analyte concentration in the mixed solution. Employing agglutinating-luminescent-material-containing particles enables measurements to be carried out with a satisfactory detection sensitivity while suppressing background fluorescence.
Influence of Zwitterions on Thermomechanical Properties and Morphology of Acrylic Copolymers: Implications for Electroactive Applications
作者:Tianyu Wu、Frederick L. Beyer、Rebecca H. Brown、Robert B. Moore、Timothy E. Long
DOI:10.1021/ma201211j
日期:2011.10.25
n-Butyl acrylate-based zwitterionomers and ionomers containing 3-[[2-(methacryloyloxy)ethyn(dimethypammonio]-1-propanesulfonate (SBMA) and 2-[butyl(dimethyl)amino]ethyl methacrylate methanesulfonate (BDMAEMA MS), respectively, were synthesized using conventional free radical polymerization. Size-exclusion chromatography confirmed the molecular weights of the copolymers exceeded the critical molecular weight between entanglements (Me) for poly(n-butyl acrylate). Differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), and atomic force microscopy (AFM) revealed that zwitterionomers promoted more well-defined microphase separation than cationic analogues. Dynamic mechanical analyses (DMA) of the copolymers showed a rubbery plateau region due to physical cross-links between charges for zwitterionomers only. Since SBMA and BDMAEMA MS have very similar chemical structures, we attributed improved microphase separation and superior elastomeric performance of the zwitterionomers to stronger association between covalently tethered charged pairs.