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Molecules 2015, 20(9), 17378-17392; doi:10.3390/molecules200917378

Preparation of Thermo-Responsive Poly(ionic liquid)s-Based Nanogels via One-Step Cross-Linking Copolymerization

1
Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education
2
Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jason P. Hallett
Received: 11 August 2015 / Revised: 11 September 2015 / Accepted: 14 September 2015 / Published: 18 September 2015
(This article belongs to the Special Issue Ionic Liquids in Organic Synthesis)
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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. View Full-Text
Keywords: ionic liquids; thermo-response; nanogels; cross-linking polymerization; UCST; CO2 conversion ionic liquids; thermo-response; nanogels; cross-linking polymerization; UCST; CO2 conversion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, J.; Liu, J.; Zuo, Y.; Wang, R.; Xiong, Y. Preparation of Thermo-Responsive Poly(ionic liquid)s-Based Nanogels via One-Step Cross-Linking Copolymerization. Molecules 2015, 20, 17378-17392.

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