Rigid-rod polyamides and polyimides prepared from 4,3 -diamino-3,5-diphenyl - biphenyl and 4-amino-4'-carboxy-3,5- diphenyl-biphenyl (original) (raw)

4,3'-Diamino-3,5-diphenyl-biphenyl and 4-amino-4'-carboxy-3,5-diphenyl-biphenyl were synthesized from the corresponding pyrylium slats. A novel class of rigid-rod polyamides and polyimides containing phenyl l pendent groups were synthesized and characterized by viscosities, elemental analyses, H n,m.r., 13C n.m.r., X-ray, t.m.a., t.g.a, and isothermal gravimetric analysis. They were amorphous or semicrystalline and dissolved in polar aprotic solvents and certain other solvents. Some of the polymers showed Tg at 225-256°C. The polymers were stable up to 375-426°C in N2 and 336-376°C in air and afforded anaerobic char yields of 59 79% at 800°C.