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Open AccessArticle

High Efficiency Gas Permeability Membranes from Ethyl Cellulose Grafted with Ionic Liquids

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College of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition, College of Architecture and Civil Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, China
2
Daqing Oilfield Construction Design and Research Institute, XiLing Road 32, Daqing 1637241, China
3
Daqing Petrochemical Research Center, Petrochemical Research Institute, China National Petroleum Corporation, Chengxiang Road 2, Daqing 163714, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(11), 1900; https://doi.org/10.3390/polym11111900
Received: 5 October 2019 / Revised: 11 November 2019 / Accepted: 13 November 2019 / Published: 18 November 2019
(This article belongs to the Special Issue Polymer Materials in Environmental Chemistry)
Ethyl cellulose was grafted with ionic liquids in optimal yields (62.5–64.1%) and grafting degrees (5.93–7.90%) by the esterification of the hydroxyl groups in ethyl cellulose with the carboxyl groups in ionic liquids. In IR spectra of the ethyl cellulose derivatives exhibited C=O bond stretching vibration peaks at 1760 or 1740 cm−1, confirming the formation of the ester groups and furnishing the evidence of the successful grafting of ethyl cellulose with ionic liquids. The ethyl cellulose grafted with ionic liquids could be formed into membranes by using the casting solution method. The resulting membranes exhibited good membrane forming ability and mechanical properties. The EC grafted with ionic liquids-based membranes demonstrated PCO2/PCH4 separation factors of up to 18.8, whereas the PCO2/PCH4 separation factor of 9.0 was obtained for pure EC membrane (both for CO2/CH4 mixture gas). The membranes also demonstrated an excellent gas permeability coefficient PCO2, up to 199 Barrer, which was higher than pure EC (PCO2 = 46.8 Barrer). Therefore, it can be concluded that the ionic liquids with imidazole groups are immensely useful for improving the gas separation performances of EC membranes. View Full-Text
Keywords: ethyl cellulose; liquid; imidazole; membrane; gas permeation properties ethyl cellulose; liquid; imidazole; membrane; gas permeation properties
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MDPI and ACS Style

Xu, J.; Jia, H.; Yang, N.; Wang, Q.; Yang, G.; Zhang, M.; Xu, S.; Zang, Y.; Ma, L.; Jiang, P.; Zhou, H.; Wang, H. High Efficiency Gas Permeability Membranes from Ethyl Cellulose Grafted with Ionic Liquids. Polymers 2019, 11, 1900.

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