Chemical cyclization of poly(Amido-acids) in solution

Виноградова, С. В.; Vygodskii, Ya. S.; Vorob'ev, V. D.; Churochkina, N. A.; Chudina, L.I.; Spirina, T. N.; Korshak, V.V.

doi:10.1016/0032-3950(74)90369-4

Cited by 33 publications

(13 citation statements)

References 3 publications

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“…[29][30][31][32] Pyridine and acetic anhydride were employed to catalyze the imidization and to scavenge water byproduct of the condensation reaction respectively. [33][34][35][36] 1,3,5-benzenetricarbonyl tri-chloride (BTC) crosslinking agent was chosen based on its ability to reduce the overall shrinkage along with enhancing the sample elasticity. [13,19] PPDA, PMDA, NMP, pyridine, acetic anhydride, and BTC were purchased from Sigma Aldrich.…”

Section: Methodsmentioning

confidence: 99%

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Mosanenzadeh

Alshrah

Saadatnia

et al. 2020

Macro Materials & Eng

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Aerogels owe their high thermal insulation and other unique properties to their nanostructure configuration. However, controlling the aerogels' morphology is always a scientific challenge. In this study, double dianhydride backbone (double backbone) polyimide aerogels with tailored nanostructure assembly are created for the first time. This is achieved by controlled polymerization reaction of oligomers with distinct dianhydride monomers. Combining the two oligomers through a controlled polymerization reaction is a successful strategy for tailoring the aerogels nanostructure assembly as well as other properties. The fabricated double backbone aerogel presents 40% reduced thermal conductivity of 19.7 mW mK−1 over previously studied polyimide aerogels along with the compression modulus of 1.64 MPa at a relatively low density of 0.068 g cm−3. Such low thermal conductivity is comparable with the inorganic counterparts. Light in weight and high thermally insulated polyimide aerogels with suitable mechanical properties and high service temperature are an appropriate replacement for current fireproof insulation materials.

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Section: Methodsmentioning

confidence: 99%

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Mosanenzadeh

Alshrah

Saadatnia

et al. 2020

Macro Materials & Eng

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“…this process must be described not by one but by at least three rate constants. The difficulties in the synthesis of polyimides associated with the instability of polyamidoacids and the reversibility of the imidisation stage can to some extent be overcome by carrying out the polycyclisation in the presence of catalytic systems 174 .2i'-26 2 such as mixtures of acetic anhydride with various tertiary amines, alkali metal acetates, silazanes, mixtures of chlorotrimethylsilane with tertiary amines, etc. By virtue of the mild temperatures (20 -100 °Q at which the catalytic cyclisation takes place, it is possible to obtain linear soluble polyimides with a reactive group, for example the cardo polyimides derived from benzophenone-3,3',4,4'-tetracarboxylic acid, which are cross-linked via the ketogroup if synthesised by other methods.…”

Section: The Catalytic Methods Is Extremely Effective In the Reactionsmentioning

confidence: 99%

Cardo polyheteroarylenes. Synthesis, properties, and characteristic features

Виноградова¹,

Васнев²,

Vygodskii³

1996

Russ. Chem. Rev.

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“…The second method is chemical imidisation, which is achieved at relatively low temperatures (around 100 C) by using a mixture of dehydration reagents and basic catalysts (Figure 2C). 40 In this method, an acid anhydride reacts with a tertiary amine to first form a quaternary ammonium compound, which assists the formation of a mixed anhydride (Figure 2C). 40,41 There are three possible pathways to convert the mixed anhydride to an imide ring.…”

Section: Intramolecular Imidisationmentioning

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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Chemical cyclization of poly(Amido-acids) in solution

Cited by 33 publications

References 3 publications

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Cardo polyheteroarylenes. Synthesis, properties, and characteristic features

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

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