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
Multiscale NMR investigation of mesogenic ionic-liquid electrolytes with strong anisotropic orientational and diffusional behaviour
A new class of mesogenic ionic-liquid electrolytes made of long-chain imidazolium cations mixed with lithium salts is described. Fast, homogeneous and uniform orientational alignment of these systems can be obtained by cooling the mixture from the isotropic melt under magnetic constraint (magnetic fields of 9.4 and 14.1 T). The local orientational behaviour of the different species inside the electrolyte and the ionic diffusional properties in oriented phases of these new materials are investigated by NMR of 2H, 7Li and 11B quadrupolar nuclei and PFG-NMR measurements, respectively. Interestingly, the local orientation of C–H internuclear directions along the alkyl chains of the imidazolium cations is examined using natural abundance deuterium (NAD) 2D-NMR spectroscopy, thus avoiding any isotopic enrichment of material. The large anisotropy of self-diffusion coefficients measured from mobile ions (Li+ and BF4−) evidences the long-range alignment of ionic slabs of these materials.
Nanoparticle dispersions with ionic liquid-based stabilizers
申请人:Texter John
公开号:US20110233458A1
公开(公告)日:2011-09-29
The disclosure generally relates to a dispersion of nanoparticles in a liquid medium. The liquid medium is suitably water-based and further includes an ionic liquid-based stabilizer in the liquid medium to stabilize the dispersion of nanoparticles therein. The stabilizer can be polymeric or monomeric and generally includes a moiety with at least one quaternary ammonium cation from a corresponding ionic liquid. The dispersion suitably can be formed by shearing or otherwise mixing a mixture/combination of its components. The dispersions can be used to form nanoparticle composite films upon drying or otherwise removing the liquid medium carrier, with the stabilizer providing a nanoparticle binder in the composite film. The films can be formed on essentially any desired substrate and can impart improved electrical conductivity and/or thermal conductivity properties to the substrate.
PROCESSES FOR NANOPARTICLE DISPERSIONS WITH IONIC LIQUID-BASED STABILIZERS
申请人:EASTERN MICHIGAN UNIVERSITY
公开号:US20150086721A1
公开(公告)日:2015-03-26
The disclosure generally relates to a dispersion of nanoparticles in a liquid medium. The liquid medium is suitably water-based and further includes an ionic liquid-based stabilizer in the liquid medium to stabilize the dispersion of nanoparticles therein. The stabilizer can be polymeric or monomeric and generally includes a moiety with at least one quaternary ammonium cation from a corresponding ionic liquid. The dispersion suitably can be formed by shearing or otherwise mixing a mixture/combination of its components. The dispersions can be used to form nanoparticle composite films upon drying or otherwise removing the liquid medium carrier, with the stabilizer providing a nanoparticle binder in the composite film. The films can be formed on essentially any desired substrate and can impart improved electrical conductivity and/or thermal conductivity properties to the substrate.