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Synthesis and characterization of aromatic–aliphatic polyamides
Author(s) -
Ubale V. P.,
Sagar A. D.,
Maldar N. N.,
Birajdar M. V.
Publication year - 2000
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 - 10.1002/1097-4628(20010118)79:3<566::aid-app200>3.0.co;2-j
Subject(s) - polyamide , thermogravimetry , monomer , polymer chemistry , acetamide , condensation polymer , glass transition , char , thermal stability , yield (engineering) , methylene , materials science , thermal analysis , thermogravimetric analysis , chemistry , polymer , organic chemistry , pyrolysis , thermal , composite material , inorganic chemistry , physics , meteorology
A new monomer, 2,5‐bis(4‐carboxy methylene phenyl)‐3,4‐diphenyl thiophene (V) has been synthesized and characterized by physical and spectroscopic methods. A series of eight aromatic–aliphatic polyamides was prepared from the (V) and different aromatic diamines using Yamazaki's direct phosphorylation reaction. The polyamides were characterized by IR spectroscopy, viscosity measurements, and thermal analysis. An excellent yield of these polyamides was obtained, with inherent viscosities in the range of 0.28 to 0.67 dL/g, and the polyamide were readily soluble in aprotic polar solvents such as N ‐methyl‐2‐pyrrolidone, N‐N ‐dimethyl acetamide, dimethyl sulphoxide, and so forth. Polyamides could be cast into transparent and flexible films. They had glass‐transition temperatures of 225–273°C. When evaluated by thermogravimetry, thermal analysis of the polyamides showed no weight loss below 311°C, and the char yield in air at 900°C was 55%–67%. The structure–property correlation among these polyamides is also discussed. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 566–571, 2001