Study of the stability of some imide type polymers in alkaline medium

The stability of some polyamide‐imides in alkaline medium was compared to the structurally related amide and imide homologs. The following order of stability in alkaline medium was established: aromatic polyamide > polyamide‐imide > polyimide. This order results from the different stabilities...

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Bibliographic Details
Published in:Die Angewandte makromolekulare Chemie 1980-10, Vol.90 (1), p.37-45
Main Authors: Neamţu, Gabriela, Airinei, Anton, Brumǎ, Maria
Format: Article
Language:English
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Summary:The stability of some polyamide‐imides in alkaline medium was compared to the structurally related amide and imide homologs. The following order of stability in alkaline medium was established: aromatic polyamide > polyamide‐imide > polyimide. This order results from the different stabilities of the poly(amic acids) formed as a result of the hydrolysis. The presence of carboxylic substituents in the ortho position to the amide groups of the poly(amic acids) determines the different stability of polymers. Die Stabilität einiger Polyamidimide in alkalischem Medium wurde mit den strukturell verwandten Amid‐ und Imidhomologen verglichen. In alkalischem Medium ergab sich die folgende Reihenfolge in der Stabilität: Aromatische Polyamide > Polyamidimide > Polyimide. Die Reihenfolge ergibt sich aus den verschiedenen Stabilitäten der Polyaminosäuren, die sich bei der Hydrolyse bilden. Die Gegenwart von Carboxylsubstituenten in der ortho‐Position zu den Amidgruppen der Polyaminosäuren bestimmt die unterschiedliche Stabilität der Polymeren.
ISSN:0003-3146
1522-9505
DOI:10.1002/apmc.1980.050900104