title: Preparation of Thermo-Responsive Poly(ionic liquid)s-Based Nanogels via One-Step Cross-Linking Copolymerization.
abstract: In this study, thermo-responsive polymeric nanogels were facilely prepared via one-step cross-linking copolymerization of ethylene glycol dimethacrylate/divinylbenzene and ionic liquid (IL)-based monomers, 1,n-dialkyl-3,3'-bis-1-vinyl imidazolium bromides ([CnVIm]Br; n = 6, 8, 12) in selective solvents. The results revealed that stable and blue opalescent biimidazolium (BIm)-based nanogel solutions could be obtained without any precipitation when the copolymerizations were conducted in methanol. Most importantly, these novel nanogels were thermo-response, and could reversibly transform to precipitation in methanol with temperature changes. Turbidity analysis and dynamic light scatting (DLS) measurement illustrated that PIL-based nanogel solutions presented the phase transform with upper critical solution temperature (UCST) in the range of 5-25 °C. The nanogels were characterized using Fourier transform infrared (FTIR), thermogravimetric analyses (TGA), and scanning electron microscopy (SEM). In addition, BIm-based nanogels could also be used as highly active catalysts in the cycloaddition reaction of CO₂ and epoxides. As a result, our attributes build a robust platform suitable for the preparation of polymeric nanomaterials, as well as CO₂ conversion.
authors.affiliation: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education. zhang_jing1121@163.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education. liujingjiang214@163.com.
authors.forename: Jingjiang
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education. zuoyong_only@163.com.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zuo
authors.affiliation: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education. wangrmcn@163.com.
authors.forename: Rongmin
authors.initials: R
authors.lastname: Wang
authors.affiliation: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education. xiongyb@mpip-mainz.mpg.de.|Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany. xiongyb@mpip-mainz.mpg.de.
authors.forename: Yubing
authors.initials: Y
authors.lastname: Xiong
mesh_terms: D003432:Cross-Linking Reagents; D007093:Imidazoles / Q000138:chemical synthesis* / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry; D000080385:Nanogels; D011092:Polyethylene Glycols / Q000138:chemical synthesis* / Q000737:chemistry; D011094:Polyethyleneimine / Q000138:chemical synthesis* / Q000737:chemistry; D058105:Polymerization; D013696:Temperature
chemical_list: D003432:Cross-Linking Reagents; D007093:Imidazoles; D052578:Ionic Liquids; D000080385:Nanogels; C413692:polyethylene glycol polyethyleneimine nanogel; D011092:Polyethylene Glycols; D011094:Polyethyleneimine
keywords: CO2 conversion; UCST; cross-linking polymerization; ionic liquids; nanogels; thermo-response