Low‐molecular‐weight poly(imide‐amide)s obtained by copolycondensation of 4,4′methylenedi(phenyl isocyanate), trimellitic acid anhydride and benzoic acid in N ‐methyl‐2‐pyrrolidone, 1. The microstructure studied by 1 H and 13 C NMR

Low‐molecular‐weight poly(imide‐amide)s (PIA) obtained by polycondensation at 180°C of 4,4′ ‐methylenedi(phenyl isocyanate), trimellitic acid anhydride and benzoic acid were studied by 1 H and 13 C NMR. Complementary 1 H and 13 C information was used to determine the distribution of II, IA, AA seque...

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Published in:Die Makromolekulare Chemie 1993-08, Vol.194 (8), p.2295-2307
Main Authors: Sintès‐Zydowicz, Nathalie, Pham, Quang Tho, Michaud, Philippe
Format: Article
Language:English
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Summary:Low‐molecular‐weight poly(imide‐amide)s (PIA) obtained by polycondensation at 180°C of 4,4′ ‐methylenedi(phenyl isocyanate), trimellitic acid anhydride and benzoic acid were studied by 1 H and 13 C NMR. Complementary 1 H and 13 C information was used to determine the distribution of II, IA, AA sequences and to show that the repartition of imide (I) and amide (A) groups along the chains is random. According to the composition of the monomer mixture, a slight deficiency of I is reproducibly observed. Non‐reacted benzoic acid is found, and unexpected traces of urea and amic acid groups are present in the PIA chains.
ISSN:0025-116X
0025-116X
DOI:10.1002/macp.1993.021940814