Synthesis and properties of new aromatic poly(ester‐imide)s derived from 4‐p‐biphenyl‐2,6‐bis(4‐trimellitimidophenyl) pyridine and various dihydroxy compounds

Abstract

A novel class of wholly aromatic poly(ester-imide)s, having a biphenylene pendant group, with inherent viscosities of 0.32-0.49 dL g −1 was prepared by the diphenylchlorophosphate-activated direct polyesterification of the preformed imide-ring-containing diacid, 4-p-biphenyl-2,6-bis(4-trimellitimidophenyl)pyridine (1) with various aromatic dihydroxy compounds in the presence of pyridine and lithium chloride. A reference diacid, 2,6-bis(trimellitimido)pyridine (2) without a biphenylene pendant group and two phenylene rings in the backbone, was also synthesized for comparison purposes. At first, with due attention to structural similarity and to compare the characterization data, a model compound (3) • C. The 10% weight loss temperatures (T 10% ) from thermogravimetric analysis curves were found to be in the range 433-471• C in nitrogen. Films of the polymers were also prepared by casting the solutions.

Synthesis and characterization of poly(ester‐ether‐imide)s derived from 5‐(4‐trimellitimidophenoxy)‐1‐trimellitimido naphthalene

“…The reaction between aromatic diamines and trimellitic anhydride is a usual manner to prepare imide ring‐containing aromatic dicarboxylic acids 1–7. This route is widely used in the field of polymeric materials for the synthesis of some copolyimides such as poly(amide‐imide)s8–12 and poly(ester‐imide)s 13–17. According to this strategy, 5‐(4‐aminophenoxy)‐1‐naphthylamine reacted with two mole equivalents of trimellitic anhydride in refluxing glacial acetic acid to obtain 5‐(4‐trimellitimidophenoxy)‐1‐trimellitimido naphthalene ( 1 ).…”

Flip‐Flop einer Wasserstoffbrücke durch einen Bjerrum’schen Defekt

“…In our previous studies we successfully prepared a series of wholly aromatic polymers from a number of structurally modified monomers 31–39. As a continuation, in the present study, we report the synthesis and characterization of novel wholly aromatic polyamides derived from PPAPE and two simple aromatic comonomers.…”

Synthesis and study of new poly(ester‐imide)s containing triptycene groups

“…The qualitative solubility properties of polymers are reported in Table . On comparing with PEIs having a biphenylene pendant group, the present series of polymers showed an enhanced solubility due to the increased flexibility or free volume caused by the introduction of a bulky pendent triptycene group in the repeat unit . The excellent solubility makes these PEIs potential candidates for practical applications in spin‐ or dip‐coating processes.…”

“…Bis(4-nitrophenoxy)phenyl Triptycene (6). Bis(4-aminophenoxy)phenyl Triptycene (7). The obtained dinitro compound, 10% Pd/C and ethanol were introduced into a three-necked flask to which hydrazine monohydrate was added dropwise at 85 C. After the addition was completed, the reaction was continued at reflux temperature for another 24 h. Then the mixture was cooled and filtered.…”