Preparation,characterisation and gas transport properties of trifluoroacetylated ethyl cellulose |
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| Affiliation: | 1. Huzhou College, Huzhou 313000, China;2. School of Chemistry and Materials Science, Ludong University, Yantai 264025, China;3. College of Life Sciences, Ludong University, Yantai 264025, China;4. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China;5. Guangxi Key Laboratory for Polysaccharide Materials and Modifications, School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning 530008, China;1. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden;2. Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden;3. Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;4. Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;1. Membranes & Materials for Environmental Separations Laboratory, Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi, Attica 153 41, Greece;2. Hepheastus Laboratory, Department of Petroleum and Mechanical Engineering, Eastern Macedonia and Thrace Institute of Technology, St. Lucas, Cavala 654 04, Greece;1. Department of Financial Engineering, University of the Aegean, Chios 821 32, Greece;2. Department of Mechanics, National Technical University of Athens, Laboratory of Testing and Materials, 157 73 Zografou Campus, Greece;3. Materials and Membranes for Environmental Separations Laboratory, Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi 153 41, Attica, Greece;1. Sustainable Membrane Technology Research Group (SMTRG), Faculty of Petroleum, Gas and Petrochemical Engineering, Persian Gulf University, P.O. Box 75169-13817, Bushehr, Iran;2. Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, Skudai, Johor DarulTa‘zim 81310, Malaysia |
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| Abstract: | A mixed ester of ethyl cellulose (EC) has been prepared by reaction of trifluoroacetic anhydride with the residual hydroxy groups of ethyl cellulose. The mixed ester is soluble in tetrahydrofuran, dichloromethane, chloroform, benzene and pyridine. FTIR and NMR spectra show that hydroxy groups of ethyl cellulose were replaced by trifluoroacetoxy groups. The trifluoroacetyl ethyl cellulose (TFAEC) has higher selectivity for oxygen relative to nitrogen, in gas transport, than unmodified EC. Annealing at an elevated temperature further improves selectivity for oxygen, whilst subsequent ageing at ambient temperature partially reduces oxygen selectivity. The tensile strength of TFAEC is virtually the same as that of unmodified EC, but the elongation to break is 200% higher than for EC. |
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