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Dehydration of benzene through fluorine containing aromatic polyamide membrane by pervaporation
Author(s) -
Gutch P. K.,
Pandey L. K.,
Saxena Chhaya
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28604
Subject(s) - membrane , polyamide , polymer chemistry , glass transition , condensation polymer , pervaporation , materials science , ultimate tensile strength , isophthalic acid , polymer , moiety , dynamic mechanical analysis , chemical engineering , chemistry , organic chemistry , composite material , permeation , polyester , biochemistry , engineering , terephthalic acid
A series of soluble polyamides were synthesized by direct polycondensation of the 5‐ tert ‐butyl isophthalic acid with different diamines. Solution (20%) of the polymers in suitable solvents was used to cast the membranes. The membranes showed selectivity toward the benzene (Bz) in a mixture of Bz/water (H 2 O). Water affinity of the membrane was found to be lower than that of Bz. The polyamide incorporating hexafluoro isopropylidene moiety was promising for the dehydaration of Bz and breaking of Bz/H 2 O azeotrope. The polymers exhibited inherent viscosities, ranging from 0.40 to 0.92 dL/g and 10% weight loss in synthetic air up to 474°C. Glass transition temperature measured by DSC and DMA reached up to 258°C. The membranes were pale yellow in appearance having tensile strength up to 85 MPa, modulus of elasticity up to 2.6 GPa, and elongation at break up to 9.5%, depending upon the exact repeating unit structure. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008