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Synthesis of aromatic polyamides from oligocarbodiimides and isophthalic acid
Author(s) -
Schotman Anton H. M.,
Weber Ton J. M.,
Mijs Wim J.
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990301)200:3<635::aid-macp635>3.0.co;2-0
Subject(s) - isophthalic acid , polyamide , thermal stability , polymer chemistry , polymer , solvent , chemistry , condensation polymer , molar ratio , organic chemistry , polyester , catalysis , terephthalic acid
A new method to synthesize aromatic polyamides from oligocarbodiimides (derived from toluenediisocyanate (TDI) and 4,4′‐diphenylmethanediisocyanate (MDI)) in N ‐methyl‐2‐pyrrolidone (NMP) as a solvent is described. Molar masses, based on end‐group analysis and size exclusion chromatography, are in the order of 15 000–20 000 ( M n ). Chemical structures of the polyamides were firmly established by means of NMR using CH‐correlation techniques. The polymers are amorphous, with T g 's from 250–268°C, dependent on the TDI/MDI ratio. Thermal stability (weight loss onset around 400°C according to TGA measurements) suggests that melt processing may be feasible.