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Date of Publication:2022-10-10

Journal:高分子学报

Issue:1

Page Number:85-89

ISSN No.:1000-3304

Abstract:A series of aromatic copolyamides were prepared from 1,2-dihydro-2-(4-aminophenyl)-4-[4-(4-(aminophenoxyl)phenyl)]phthalazin-1-one (DHPZ-DA), p-phenylenediamine (PPD),1,4-bis(4-aminophenoxy)benzene (BAPOB) and terephthaloyl dichloride by low temperature solution polycondensation. The polymers had relatively high inherent viscosities ranging from 1.74 dL/g to 4.31 dL/g. The polymers exhibit improved solubility in polar aprotic solvents with or without the addition of LiCl because of the introduction of twisted non-coplanar phthalazinone moieties and flexible ether linkages. The polymers had high thermal stability. Their glass transition temperature (T-g) values were in the range of 291 similar to 351 degrees C, and the 5 % and 10 % weight loss temperatures in nitrogen were in the range of 486 similar to 504 degrees C and 509 similar to 528 degrees C respectively. WAXD measurements indicated that these copolyamides were amorphous. Most of the polymers exhibited lyotropic liquid crystalline characteristics in conc. H2SO4, NMP/(10 g/L LiCl) and DMAc/(10 g/L LiCl) solutions. The polyamides with excellent properties made it possible for the different processing and applications such as dry-wet spinning of fibers or the preparation of films, membranes and coatings.

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