Hydrophobic 1-allyl-3-alkylimidazolium dicyanamide ionic liquids with low densities
摘要:
制备并表征了九种1-烯丙基-3-烷基咪唑双氰胺([ACnIm]DCA)或1-乙烯基-3-烷基咪唑双氰胺([VCnIm]DCA),并详细研究了它们的物理化学性质。除了[AVIm]DCA和[AC4Im]DCA外,阳离子带有己基或更长烷基的其他双氰胺表现出疏水性特征。其中,[AC8Im]DCA和[AC10Im]DCA的密度与水相似,分别为1.007 g cm−3和0.988 g cm−3(25°C)。有趣的是,随着温度的变化,观察到了[AC8Im]DCA/H2O混合物的可逆相变。这些环境友好的液体材料有望作为导电高分子材料合成的前驱体。
Imidazolium-based polyionic liquid absorbents for bioproduct recovery
作者:Stuart L. Bacon、Rachel J. Ross、Andrew J. Daugulis、J. Scott Parent
DOI:10.1039/c7gc02806g
日期:——
However, the cross-linked PILs’ solute absorption capacity and selectivity for butanol relative to water were below the levels likely needed for a viable extractive fermentation process. Uncross-linked PILs bearing long-chainaliphatic substituents also proved to be biocompatible by virtue of their insolubility in water, and delivered significantly improved absorptive performance. Among biocompatible absorbents
hydrophobic alkyl chains as the building blocks, followed by ion exchange with Keggin-type phosphotungsticacid (PW). The obtained hybrids POSS–ILx–PW were demonstrated to be mesostructured and amphiphilic materials with good thermalstability. Catalytic tests for the H2O2-based epoxidation of cyclooctene have shown that these newly designed catalysts exhibit extraordinary catalyticactivities, catalytic
使用多面体低聚乙烯基硅倍半氧烷(POSS)和带有疏水性烷基链的离子液体(IL)作为构建基,然后与Keggin型磷钨酸(PW)进行离子交换,成功合成了一系列新型的基于多金属氧酸盐(POM)的稳定聚合物杂化物)。所获得的杂种POSS–IL x –PW被证明是介观结构和两亲材料,具有良好的热稳定性。H 2 O 2的催化测试环辛烯的环氧基氧化表明,这些新设计的催化剂表现出非凡的催化活性,催化速率和相当稳定的可重复使用性。揭示了独特的两亲性和介孔结构是造成催化剂在与H 2 O 2的环氧化反应中优异性能的原因。
Pore structure controllable synthesis of mesoporous poly(ionic liquid)s by copolymerization of alkylvinylimidazolium salts and divinylbenzene
作者:Xuping Feng、Chenjue Gao、Zengjing Guo、Yu Zhou、Jun Wang
DOI:10.1039/c4ra03163f
日期:——
By chain radical copolymerizations of imidazolium-type ionic liquids and divinylbenzene, mesoporous poly(ionic liquid)s with tunable pore structures were synthesized.
Poly(ionic liquid) Latexes Prepared by Dispersion Polymerization of Ionic Liquid Monomers
作者:Jiayin Yuan、Markus Antonietti
DOI:10.1021/ma102858b
日期:2011.2.22
vinylimidazolium-typed poly(ionic liquid) (PIL) latexes and nanoparticles via dispersionpolymerization of ionic liquid monomers in aqueous solutions. A homologous series of vinylimidazolium-typed ionic liquid monomers with different alkyl tail length (C8−C18) were synthesized via quaternization of 1-vinylimidazole with corresponding n-alkyl bromides. Dispersionpolymerization of these monomers was conducted
在这项贡献中,我们报告了通过离子液体单体在水溶液中的分散聚合反应,可以轻松制备乙烯基咪唑型的聚(离子液体)(PIL)胶乳和纳米颗粒。通过1-乙烯基咪唑与相应n的季铵化反应,合成了具有不同烷基尾长(C8-C18)的乙烯基咪唑鎓型离子液体单体的同源系列-烷基溴化物。这些单体的分散聚合反应是在70°C的水溶液中,以50 g / L的单体浓度进行的,而无需添加其他稳定剂。对于具有足够长的烷基链(≥C12)的离子液体单体,发现了直径为20-40 nm的PILs纳米颗粒,它们在水性介质中是自稳定的。在相同的步骤中,在10 mol%的基于二乙烯基咪唑基的交联剂的存在下进行交联的PIL纳米颗粒的制备。与双(三氟甲基磺酰基)酰亚胺锂进行阴离子交换后,合成后的交联PIL纳米颗粒可以转移到有机溶剂中,例如极性DMF和非极性甲苯。这种分散聚合不需要分散剂,并有可能在水溶液和有机溶液中大规模合成PIL纳米粒子。预期
Chaotropic Monovalent Anion‐Induced Rectification Inversion at Nanopipettes Modified by Polyimidazolium Brushes
作者:Xiulan He、Kailin Zhang、Yang Liu、Fei Wu、Ping Yu、Lanqun Mao
DOI:10.1002/anie.201800335
日期:2018.4.16
monovalent anion‐induced ion current rectification inversion at polyimidazolium brush (PimB)‐modified nanopipettes is presented. The rectification inversion degree is strongly dependent on the concentration and species of monovalent anions. For chaotropic anions (for example, ClO4−), the rectification inversion is easily observed at a low concentration (5 mm), while there is no rectification inversion observed