Investigation of polyimide formation from the complexes of the diester of benzophenonetetracarboxylic acid with diamines 7. Role of theo-carboxylic group of acid diester in the formation and imidization of H-complexes

Artem'eva, V. N.; Kudryavtsev, V. V.; Chupans, P. I.; Yakimansky, Alexander V.; Lubimova, G. V.

doi:10.1007/bf00707046

Cited by 1 publication

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“…Moreover, we were interested in the question, which reaction product (imide, amide and anhydride) from which starting product would be possible, energywise, and how temperature influences thermodynamic equilibria. To the best of our knowledge, no computational calculations have been performed up to date concerning the imide formation via the monomer salt pathway, with the exception of Artem'eva et al, 28 who performed semiempirical AM1 29 simulations investigating the formation of polyimide from diester-dicarboxylic-acid and diamine monomers. Interestingly, a minimum for the salt structure of the simulated compound was found on the surface of the potential energy.…”

Section: Computational Studiesmentioning

confidence: 99%

Mechanistic study of hydrothermal synthesis of aromatic polyimides

et al. 2011

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A mechanistic study regarding the synthesis of aromatic polyimides (PIs) under hydrothermal conditions is presented. We demonstrate evidence that the first step of the reaction is the formation of a nylon type salt, which can be isolated. Upon heating the salt in the presence of water at 180 C, polyimides are formed from the salts. Additionally performed DFT calculations substantiate the experimental findings and give evidence that the formation of imides is energetically favorable in hot water. The intermediate salts as well as the resulting PIs are characterized by diverse analytical techniques (SEC, FT-IR, WAXS, SEM). By selective fractionation, it is possible to obtain polyimides of moderate to high molecular weights that form tough films. The polymerization mechanism is discussed, and it is shown that different loci of reaction are possible, namely interfacial polycondensation, heterophase polymerization and topochemical transformations, which seem to occur in parallel. Finally, poloxamers can be used as additives for the fine-tuning of the polymer morphology.

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Section: Computational Studiesmentioning

confidence: 99%