Water-borne Polyimides via Microwave-assisted Polymerization

Brunel, Raphaël; Marestin, Catherine; Martin, Vincent; Merçier, Régis

doi:10.1177/0954008308101150

Cited by 10 publications

(8 citation statements)

References 36 publications

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“…In this study, we use a microwave reactor enabling control over the heating time, t h . Microwave‐assisted PI syntheses in water have been previously reported, the final PIs were however noncrystalline: Brunel et al . obtained amorphous PIs most likely due to the highly flexible monomers they employed, and Dao et al .…”

Section: Introductionmentioning

confidence: 99%

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Design Strategies in Hydrothermal Polymerization of Polyimides

Baumgartner

Bojdys

Skrinjar³

et al. 2016

Macro Chemistry & Physics

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Hydrothermal polymerization (HTP) is a technique to synthesize highly crystalline polyimides in solely water. The process involves monomer salt intermediates also able to undergo other polymerizations during the HTP experiment: sub‐hydrothermal polymerization (sHTP) and solid‐state polycondensation (SSP). Both processes yield semicrystalline polyimides at best. This is widely believed to result from irreversible bond‐formation and the incorporation of conformational defects during chain growth. Here, microwave‐assisted HTP is used, allowing for controlling the heating time to the reaction temperature, and thus to strongly reduce sHTP. Moreover, we show that highest crystallinity can be obtained in the higher hydrothermal regime (≈200 °C), and synthesize two polyimides of sufficient crystallinity to refine their crystal structures from powder X‐ray diffraction data. This study brings us one step closer to a general picture and rational design of the hydrothermal synthesis of polyimides.

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Section: Introductionmentioning

confidence: 99%

“…Microwave‐assisted PI syntheses in water have been previously reported, the final PIs were however noncrystalline: Brunel et al . obtained amorphous PIs most likely due to the highly flexible monomers they employed, and Dao et al . synthesized statistical co‐polyimides that were also amorphous .…”

Section: Introductionmentioning

confidence: 99%

Design Strategies in Hydrothermal Polymerization of Polyimides

Baumgartner

Bojdys

Skrinjar³

et al. 2016

Macro Chemistry & Physics

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show abstract

“…19 Synthesis of high performance polymers under microwave irradiation (MW) has also been reported. [20][21][22][23] In general, use of MW resulted in an acceleration of the polymerizations and even promoted the formation of polymers with higher molecular weights. Synthesis of PBIs in PPA solution under MW afforded readily soluble polymer in much shorter reaction time in comparison with conventional heating (CH).…”

Section: Introductionmentioning

confidence: 99%

Eaton’s reagent in polybenzimidazole synthesis

Olvera‐Mancilla

Palacios‐Alquisira

Alexandrova

2017

High Performance Polymers

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The polycondensations of 3,3′-diaminobenzidine with two acids, 4,4′-oxybis(benzoic acid) and hexafluoroisopropylidene bis(benzoic acid), were conducted in Eaton’s reagent at the unusually high temperature of 180°C and under microwave irradiation at 90°C. Both protocols resulted in soluble polybenzimidazoles, OPBI and CF3PBI, of high molecular weights in very short reaction times. The synthesized polybenzimidazoles exhibited high thermostability and excellent mechanical properties. The influence of the reaction conditions on the polymer structure and molecular weights was studied. The “microwave effect” was demonstrated by comparison of the polycondensations conducted under microwave irradiation and conventional heating.

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“…What becomes immediately clear is the analogy to inorganic polycondensations [8], such as the already discussed generation of silicates by condensation of Si(OH)4 in the presence of cations. Since normalH2O is well suited for being rapidly heated by microwave (MW) irradiation, PI syntheses of short reaction times (down to <1 h) were soon reported in MW-assisted hydrothermal PI synthesis [72,73]. While the latter reports ascertained the feasibility of PI synthesis in HTW at autogenous pressure, little was known about the mechanism.…”

Section: Discussionmentioning

confidence: 99%

Geomimetics and Extreme Biomimetics Inspired by Hydrothermal Systems—What Can We Learn from Nature for Materials Synthesis?

Unterlass

2017

Biomimetics

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'Extreme biomimetics' and 'geomimetics' are relatively recent fields of materials chemistry. Both take inspiration from natural materials for generating novel synthetic materials or enhanced properties in known materials. In geomimetics, the source of inspiration is geological systems, while extreme biomimetics is motivated by organisms operating in-from an anthropocentric point of view-extreme conditions. This review article focuses on geomimetic and extreme biomimetic hydrothermal synthesis. Since hydrothermal preparative chemistry typically uses nothing but water and the required precursors, the field belongs to the research area of 'green materials chemistry'. Geomimetics, on the one hand, takes inspiration from natural materials formation. Extreme Biomimetics, on the other hand, is inspired by materials found in extremophile organisms, instead of aiming to implement their actual biosynthesis. In this contribution, both extreme biomimetics and geomimetics are first defined, and further critically discussed on the basis of recent, selected examples. Moreover, the necessity for the two closely related fields as well their prospects are commented on.

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Water-borne Polyimides via Microwave-assisted Polymerization

Cited by 10 publications

References 36 publications

Design Strategies in Hydrothermal Polymerization of Polyimides

Design Strategies in Hydrothermal Polymerization of Polyimides

Eaton’s reagent in polybenzimidazole synthesis

Geomimetics and Extreme Biomimetics Inspired by Hydrothermal Systems—What Can We Learn from Nature for Materials Synthesis?

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