Aromatic polyimide‐co‐amides. I

Abstract

SynopsisA series of aromatic polyimide-co-amides of high thermal stability were synthesized.Low-temperature solution condensation involving aromatic diamines of varying basicity and bifunctional carboxylic acid chlorides containing preformed imide rings was employed. This approach offers several advantages over the conventional polyamic acid route. The final polymers obtained are linear, soluble, and of high molecular weight. Solution of the final polymers are stable in contrast to polyamic acid solutions, which depolymerize hydrolytically due to the neighboring-group effect. Tough, flexible films were cast from solution and required no heat cure. The properties of one polymer made by the preformed ring approach were compared to its structurally related amide and b i d e homologs.

New poly(amide-imide)s syntheses. XXIII. Synthesis and properties of poly(amide-imide)s derived from 4,4?-[1,4-phenylenebis(isopropylidene-1,4-phenyleneoxy)]dianiline and various bis(trimellitimide)s

“…Conventionally, aromatic poly(amide-imide)s can be prepared in several ways starting from trimellitic anhydride (TMA), such as twostep polycondensation from the acid chloride of TMA with aromatic diamines involving polyaddition and subsequent cyclodehydration, 1 low-temperature solution polycondensation of TMA-derived imide ring-preformed diacid chloride and aromatic diamines, 2 polycondensation of TMA or TMA-derived imide ring-containing dicarboxylic acids with diisocyanates, 3 and phosphorylation polyamidation between TMA-derived imide ringpreformed dicarboxylic acids and aromatic diamines. 4 Since we successfully applied the phosphorylation reaction 5 to the direct synthesis of highmolecular-weight poly(amide-imide)s from the TMA-derived imide ring-bearing dicarboxylic acids and aromatic diamines using triphenyl phosphite (TPP) and pyridine (Py) as condensing agents, 6 this route has proved to exhibit significant advantages in preparing operations in comparison with conventional acid chloride or isocyanate methods.…”

Phenolic resins bearing maleimide groups: Synthesis and characterization

“…All other solvents were reagent grade and used without further purification. N-phenylmaleimide 14 and phenylphthalimide 15 were synthesized by reported procedures.…”

Synthesis and characterization of poly(aryl amide imide)s derived from diphenyltrimellitic anhydride

“…Conventionally, aromatic poly(amide imide)s can be prepared in several ways, such as two-step polymerization involving polyaddition and subsequent cyclodehydration, 15 low-temperature solution polycondensation, 16 and phosphorylation polyamidation. 17 Owing to the reactivity of monomer 5, a two-step polycondensation process was used.…”