Preparation of Thermo-Responsive Polyionic liquids-Based Nanogels via One-Step Cross-Linking CopolymerizationReportar como inadecuado




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1

Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education

2

Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany





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Author to whom correspondence should be addressed.



Academic Editor: Jason P. Hallett

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 CnVImBr; 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





Autor: Jing Zhang 1, Jingjiang Liu 1, Yong Zuo 1, Rongmin Wang 1 and Yubing Xiong 1,2,*

Fuente: http://mdpi.com/



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