Rigid-rod polyamides and polyimides prepared from 4,3″-diamino-2′,6′-di(2-naphthyl)-p-terphenyl and 2′,6′,3‴,5‴-tetra(2-naphthyl)-4,4″-diamino-p-quinquephenyl
✍ Scribed by John A. Mikroyannidis
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 212 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
A series of rigid-rod polyamides and polyimides containing p-terphenyl or p-quinquephenyl moieties in backbone as well as naphthyl pendent groups were synthesized from two new aromatic diamines. The polymers were characterized by inherent viscosity, elemental analysis, FT-IR, 1 H-NMR, 13 C-NMR, X-ray, differential scanning calorimetry (DSC), thermomechanical analysis (TMA), thermal gravimetric analysis (TGA), isothermal gravimetric analysis, and moisture absorption. All polymers were amorphous and displayed T g values at 304 -337°C. Polyamides dissolved upon heating in polar aprotic solvents containing LiCl as well as CCl 3 COOH, whereas polyimides were partially soluble in these solvents. No weight loss was observed up to 377-422°C in N 2 and 355-397°C in air. The anaerobic char yields were 57-69% at 800°C.