Synthesis, Characterization and Gas Separation Properties of Polyimides Containing Fluorene Units

DOI

10.2991/icadme-15.2015.14How to use a DOI?

Keywords

Polyimide; Flourene; Gas separation properties; Solubility; Structure and properties

Abstract

The six kinds of polyimides(PIs) containing fluorene units were prepared from 9,9 -bis(4-aminophenyl)fluorene(BAF) with various dianhydrides including 2,2 -bis-(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA), 3,3',4,4'-biphenyltetracarboxylic dianhydride(BPDA), 4,4'-oxydiphthalic anhydride(ODPA), 3,3',4,4'-biphenyltetracarboxylic dianhydride(BTDA), pyromellitic dianhydride(PMDA) and 1,2,3,4-cyclobutanetetracarboxylic dianhydride(CBDA) via chemical imidization. Wide-angle X-ray diffractograms revealed that the polymers were amorphous. Most of the polyimides exhibited good solubility and could be readily dissolved in various solvents such as N-Methyl-2-pyrrolidone(NMP), N,N-dimethylacetamide(DMAc), N,N-dimethylformamide(DMF), and so on. The polyimide was thermally treated at 300 , 420 and 550 for further carbonization. Gas permeation properties for O2 and N2 of the PI-BPDA and PI-CBDA membranes were investigated. The permeability coefficients and selectivity for O2 and N2 of polyimide were obtained. With the increase of thermal treatment temperature, the permeability for O2 and N2 of polyimides increased, but the selectivity decreased. The gas separation mechanism for O2 and N2 was mainly molecular sieving.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yunhua Lu
AU  - Mingyue Fei
AU  - Xin Jin
AU  - Guoyong Xiao
AU  - Zhizhi Hu
AU  - Tonghua Wang
PY  - 2015/10
DA  - 2015/10
TI  - Synthesis, Characterization and Gas Separation Properties of Polyimides Containing Fluorene Units
BT  - Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering
PB  - Atlantis Press
SP  - 62
EP  - 67
SN  - 2352-5401
UR  - https://doi.org/10.2991/icadme-15.2015.14
DO  - 10.2991/icadme-15.2015.14
ID  - Lu2015/10
ER  -