Abstract
An unsymmetrical and non-coplaner heterocyclic phosphorus containing dicarboxylic acid monomer, (DCA-3) is successfully synthesized with high purity. A series of novel aromatic poly(amide-imide)s having ether or/sulphur or/fluorine or/phosphorus containing phenyl moieties in their backbone are then prepared via a direct phosphorylation polycondensation of synthesized dicarboxylic acid with various aromatic diamines. Chemical structures of DCA-3 as well as resulting polymers are confirmed by FT-IR, NMR spectroscopic techniques and elemental analysis. These polymers are readily soluble in a variety of aprotic polar solvents such as NMP, DMSO, DMAc and DMF, etc. UV spectra showed that all poy(amide-imide)s films exhibit high optical transparency. In addition, the glass transition temperatures (Tg) of these polymers were determined by differential scanning calorimetry and found in the range 271–346∘C. Furthermore, thermogravimetric analysis of these polymers showed good thermal stability, 10% weight loss at temperature in excess of 538∘C and char yield at 700∘C in nitrogen ranging from 68 to 79%. From wide-angle X-ray diffraction experiments, all polymers showed amorphous behaviour.
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The author (S. Agrawal) is grateful to Guru Gobind Singh Indraprastha University, New Delhi for providing financial support in the form of IPRF.
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Supplementary information contains elementary data of polymer 5a, 5b, 5c and 5d. GPC data of polymer 5c, 1H-NMR spectra of polymer 5a, 5c and 5d and is available at www.ias.ac.in/chemsci.
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AGRAWAL, S., NARULA, A.K. Synthesis and characterization of heat-resistant and soluble poly(amide-imide)s from unsymmetrical dicarboxylic acid containing 2-(triphenyl phosphoranylidene) moiety and various aromatic diamines. J Chem Sci 127, 737–749 (2015). https://doi.org/10.1007/s12039-015-0830-1
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DOI: https://doi.org/10.1007/s12039-015-0830-1