Curing of epoxy-anhydride formulations in the presence of imidazoles

Fedoseev, M. S.; Derzhavinskaya, L. F.; Стрельников, В. Н.

doi:10.1134/s107042721008015x

Cited by 14 publications

(10 citation statements)

References 2 publications

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“…As discussed earlier, the curing process of ER/imidazolium‐based ILs involves the formation of imidazole or alkyl imidazole through the IL decomposition, as the first step. Imidazole derivatives are well‐known catalysts for the curing of epoxy by anhydride . Therefore, the latent property of bmim.BF 4 may be attributed to the lower decomposition rate of this IL to generate the imidazole or alkyl imidazole.…”

Section: Resultsmentioning

confidence: 99%

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

Carvalho

Santos

Soares

2019

J of Applied Polymer Sci

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A new transparent microwave absorbing coating was developed by compounding 1-butyl-3-methyl imidazolium tetrafluoroborate (bmim.BF 4 ) ionic liquid (IL) with diglycidyl ether of bisphenol A-type epoxy resin. The systems were crosslinked with the IL alone or combined with conventional hardeners, as anhydride or aromatic amine. The curing behavior was investigated by thermal and spectroscopic analysis performed at high temperatures. Neat bmim.BF 4 was able to cure epoxy resin, giving rise to networks with outstanding thermal stability compared with the systems cured with anhydride or aromatic amine. bmim.BF 4 accelerated the curing process in the presence of aromatic amine but retarded this event when anhydride was used as an external curing agent. The glass-transition temperature evaluated by dynamic mechanical analysis decreased when the amount of IL increased, which can be attributed to side reactions during the curing process, as well as the plasticizing effect of IL. The epoxy networks cured with bmim.BF 4 alone or in combination with anhydride or aromatic amine were transparent and presented considerable microwave absorbing properties in the X-band frequency range (8-12 GHz), being the best performance observed for the systems cured with bmim.BF4/anhydride curing system, with reflection loss value around −16 dB at 11.3 GHz.

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Section: Resultsmentioning

confidence: 99%

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

Carvalho

Santos

Soares

2019

J of Applied Polymer Sci

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“…[26] As am ultifunctional monomer,E LO could generate materials with better thermomechanical properties than those of bifunctional epoxies cured with the same hardener. [27][28][29][30][31] To cross-link epoxies,a mines and carboxylic acida nhydrides are the mostc ommonly used hardeners.…”

Section: Introductionmentioning

confidence: 99%

From Epoxidized Linseed Oil to Bioresin: An Overall Approach of Epoxy/Anhydride Cross‐Linking

Sbirrazzuoli

Mija

2015

ChemSusChem

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Biorenewable resources can be used as green monomers to design tailored structures for formulations that can play an important role as functional materials. The choice of optimal structures depends on the targeted properties and applications. This work focuses on the elaboration of biobased materials with toughened mechanical properties based on epoxidized linseed oil. This result was obtained by an overall approach of cross-linking process, that is, starting with the optimal choice of hardeners and finally favoring the side reactions of polymerization. Therefore, the anionic alternating copolymerization of epoxide with mono- and dianhydrides was investigated to tailor the parameters that led to maximal conversions and properties. The obtained highly cross-linked networks perform well, as demonstrated by good impact strengths, high glass transition temperatures, and excellent thermal stability, which opens up the possibility of using these emergent materials for industrial applications.

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“…Imidazoles appear to be promising curing catalysts [9][10][11]. It has been shown in [10,12] that polymers synthesized using imidazole catalysts and curing agents have larger heat resistance, adhesion, and water resistance. While investigating kinetics and interaction mechanism of epoxides with acid anhydrides in the presence of imidazoles, these imidazoles were shown to be comparable with tertiary amines in catalytic action.…”

Section: Introductionmentioning

confidence: 99%

1-Butyl-3-methylimidazolium Salts as New Catalysts to Produce Epoxy-anhydride Polymers with Improved Properties

Fedoseev

Груздев

Derzhavinskaya

2014

International Journal of Polymer Science

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We report the curing process of epoxy oligomers by using isomethyltetrahydrophthalic anhydride catalyzed with 1-butyl-3-methylimidazolium salts. Catalytic action has been ascertained to be dependent on the nature of anion. Salts with(Br-)and(PO4-)anions appeared to be most active. Formation of salt adducts with epoxy resin and anhydride is shown. Polymers having higher values of strength and glass transition temperature—as compared with similar epoxy systems cured in the presence of tertiary amines as catalysts—are prepared.

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Curing of epoxy-anhydride formulations in the presence of imidazoles

Cited by 14 publications

References 2 publications

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

Epoxy/imidazolium‐based ionic liquid systems: The effect of the hardener on the curing behavior, thermal stability, and microwave absorbing properties

From Epoxidized Linseed Oil to Bioresin: An Overall Approach of Epoxy/Anhydride Cross‐Linking

1-Butyl-3-methylimidazolium Salts as New Catalysts to Produce Epoxy-anhydride Polymers with Improved Properties

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