Three simple steps lead from S8 to cyclo‐S14, which is stable at 20°C. The final synthetic step [Eq. (a)] provides the title compound, which was characterized spectroscopically and by X‐ray structure analysis. Formally, the structure of S14 is derived by insertion of an S2 unit into S12. tmeda=N,N,N′,N′‐tetramethylethylenediamine.
Aromatic polyamides with imide pendent groups were prepared from 4,4'-diaminodiphenylether and imide-diacid chlorides by solution polycondensation. Imidediacid chlorides used included the diacid chlorides of 5-maleimidoisophthalic, 5-dichloromaleimidoisophthalic, 5-tetrahydrophthalimidoisophthalic, 5-chlorendimidoisophthalic, 5-nadimidoisophthalic, 5-methylnadimidoisophthalic and 5-phthalimidoisophthalic acid. The pure aromatic polyamide from 4,4'-diaminodiphenylether and isophthaloyl chloride was also prepared for comparative reasons.Polyamide-imides are soluble in polar organic solvents and show good thermal resistance. They are film-forming and the films have good mechanical properties. Those polyamide-imides which contain unsaturated carbon-carbon bonds may be crosslinked by heating to 220°C, giving rise to insoluble materials with improved mechanical resistance.
ZUSAMMENFASSUNG:Aromatische Polyamide mit Imidseitengruppen wurden aus 4,4 '-Diaminodiphenylether und Imid-Disaurechloriden durch Losungspolykondensation hergestellt. Die verwendeten Imid-Disaurechloride urnfafiten die Disaurechloride von 5-Maleinimidoisophthalsaure, 5-Dichlormaleinimidoisophthalsaure, 5-Tetrahydrophthalimidoisophthalsaure, 5-Hexachlorendomethylentetrahydrophthalimidoisophthalsaure, 5-Endomethylentetrahydrophthalimidoisophthals&ue, 5-Methylenendomethylentetrahydrophthalimidoisophthalsaure, und 5-Phthalimidoisophthalsaure. Das reine aromatische Polyamid aus 4,4 '-Diaminodiphenylether und Isophthaloylchlorid wurde zu Vergleichszwecken ebenfalls hergestellt.Polyamidimide sind in polaren organischen Losungsmitteln ldslich und zeigen gute thermische Bestandigkeit. Sie konnen Filme bilden, die gute mechanische Eigenschaften haben. Diejenigen Polyamidimide, die ungesattigte Kohlenstoff-Kohlenstoff-Bindungen enthalten, kiinnen durch Erhitzen auf 220 "C vernetzen und geben unlosliche Materialien mit verbesserter mechanischer Festigkeit.
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