Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 447, Issue -, Pages 413-423Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2013.07.050
Keywords
Poly(ether amide) membranes; Optical transparency; Dielectric constant; Gas permeability
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Funding
- CSIR, New Delhi
- Department of Science and Technology (DST), India [SR/S3/ME/0008/2010]
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A newly designed diamine monomer, 1,4-bis-[{2'-trifluoromethyl 4'-(4 ''-aminophenyl)phenoxy}]2,5-di-t-butylbenzene, was successfully used to synthesize several polyamides (PAs) for membrane-based gas separation applications. All the synthesized polymers were soluble in many organic solvents and exhibited high molecular weight, high thermal stability (up to 431 degrees C and 466 degrees C in air and nitrogen respectively, for 10% weight loss) and high glass transition temperature (275-286 degrees C). Membranes obtained from these PAs were optically transparent (lambda(cut off)=372-400 nm) and showed tensile strength up to 107 MPa. In general all the membranes showed very high permeability and high permselectivity for a pair of gases. The gas transport properties of the polymers have been correlated with their FFV interchain distance (d-spacing), diffusivity, solubility, and dielectric constant values. (c) 2013 Elsevier B.V. All rights reserved.
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