Some features of the synthesis of heat-resistant heterocyclic polymers

Праведников, А.Н.; Kardash, I. E.; Glukhoyedov, N.P.; Ardashnikov, A.Ya.

doi:10.1016/0032-3950(73)90211-6

Cited by 26 publications

(6 citation statements)

References 5 publications

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“…The first important point to note is that the reactants and the product are in equilibrium, i.e. the propagation reaction is reversible [12,13]. The forward reaction is thought to start with the formation of a charge transfer complex between the dianhydride and the diamine [9,14,15].…”

Section: Two-step Methods For Polyimide Synthesismentioning

confidence: 99%

Synthesis of aromatic polyimides from dianhydrides and diamines

Harris¹

1990

Polyimides

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Section: Two-step Methods For Polyimide Synthesismentioning

confidence: 99%

Synthesis of aromatic polyimides from dianhydrides and diamines

Harris¹

1990

Polyimides

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“…At elevated temperatures, the conversion of amic acid to imide bonds is reversible. 45 Under vacuum, poly(amic acid) can thermally decompose into amine, carboxylic acid, and anhydride monomers. PIs may further react with other amine-containing compounds to deimidise and form crosslinking networks.…”

Section: Intramolecular Imidisationmentioning

confidence: 99%

“…Although PIs are durable under harsh chemical environment, the imide bond is still susceptible to degradation. At elevated temperatures, the conversion of amic acid to imide bonds is reversible 45 . Under vacuum, poly(amic acid) can thermally decompose into amine, carboxylic acid, and anhydride monomers.…”

Section: Syntheses Of Polyimidesmentioning

confidence: 99%

Recent development of polyimides: Synthesis, processing, and application in gas separation

Zhao-yu

Croft

Guo

et al. 2021

Journal of Polymer Science

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High-performance polymers have been concomitant with advanced technology for half a century. With the advancement of synthetic chemistry, the recent development of high-performance polymers has provided superior properties and enabled wide applications. This article reviews recent research progress in aromatic high-performance polymers. Particularly, we focus on the synthesis and processing of polyimides, as well as the application in gas separation membranes. We begin with a brief introduction to highlight important history and physiochemical characteristics of polyimides. Then, we review the various synthesis methods, followed by recent advances for improving processability. Finally, we evaluate the use of high-performance polymers in gas separation membranes with focus given to the key issues of plasticization and aging. Overall, the information presented herein provides an up-to-date overview of high-performance polymers, polyimides particularly, and serves as a guide for further research involving the applications in membrane technologies.

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“…THF, not being very basic, does not associate with the polyamic acid and some reversal occurs. This "retro" reaction (k 2 ) occurs when a proton is transferred from a carboxylic acid to an amide nitrogen (or any other basic species), followed by the subsequent attack of the carboxylate oxygen on the adjacent carbonyl carbon to re-form the anhydride or the rare isoimide (25,27). This reverse reaction can be prevented by replacing the hydroxyl proton of the polyamic acid with amine salts or esters, causing a marked decrease in conversion to monomeric species (28)(29)(30).…”

Section: Reactionmentioning

confidence: 99%

Polyimides

Bryant¹

2002

Encyclopedia of Polymer Science and Technology

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Polyimides are a class of high performance polymers that contain an imide group, defined as an sp 3 nitrogen bonded to two adjacent carbonyls. This imide structure is most commonly found as part of a five‐ or six‐membered ring. Polyimides are noted for their mechanical properties, chemical resistance, and dielectric strength. They exist as thermoplastics and thermosets. Polyimides are used as hot melt adhesives, matrix resins for composites, dielectric films, photoimageable coatings, flex circuits, foams, wire insulation, thin‐walled tubing, molding resins, and high performance bushings and seals. Products that compete with polyimides for niche applications include aerospace epoxies (Dow, Ciba, and Shell), cyanate resins (Dow), polysulfones (Solvay), filled polycarbonates and polyesters (Dow, Amoco, and GE), polybenzimidazoles (Hoechst‐Celanese), and some high T g filled phenolics. Although polyimides command a premium price, their versatility, reliability, and demonstrated performance make them suitable for use in high performance applications where failure and replacement costs are high.

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Some features of the synthesis of heat-resistant heterocyclic polymers

Cited by 26 publications

References 5 publications

Synthesis of aromatic polyimides from dianhydrides and diamines

Synthesis of aromatic polyimides from dianhydrides and diamines

Recent development of polyimides: Synthesis, processing, and application in gas separation

Polyimides

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