Polyamides from perchloro‐4,4′‐dichloroformylbiphenyl

Abstract

New thermally stable polyamides were prepared by low‐temperature polycondensation in N,N‐dimethylacetamide from perchloro‐4,4′‐dichloroformylbiphenyl and various aromatic and aliphatic diamines. The polymers were characterized by infrared spectroscopy, elemental analysis, TGA, and DSC and found to show higher thermal stability than other nonchlorinated polyamides.

Synthesis and characterization of polyesters derived from polychlorinated aromatic diacids

“…(2) T,,, -T, is in general a small value, especially for condensation poly-(3) Tvicat and 7'4. 6 have essentially the same value for a given polymer.…”

Synthesis and properties of new halogen-substituted polyamides from 5-halo-m-phenylenediamines and both aliphatic and aromatic dicarboxylic acids

“…Actually, several authors have reported the synthesis and characterization of halogen-containing polyamides from chloro-substituted and bromo-substituted aromatic dicarboxylic acids [1][2][3][4][5][6][7] or halogenated aromatic diamines, [7][8][9][10][11][12][13][14] where chloro-substituents and bromo-substituents were incorporated, in most cases, on the aromatic ortho position to the amide linkage. Pearce et al [11][12][13][14] reported that the high flame retardancy of the polyamides substituted with halogens in the ortho position to the NH group was attributable to intramolecular cyclization that gave benzoxazole rings and enhanced crosslinking as well.…”