Acceleration of epoxy resin curing by using a combination of aliphatic and aromatic amines

Ignatenko, V. Ya.; Ilyin, Sergey O.; Kostyuk, Anna V.; Бондаренко, Г. Н.

doi:10.1007/s00289-019-02815-x

Cited by 33 publications

(24 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For instance, to obtain the best properties it is necessary an optimum curing reaction, which implies that the amount of curing reagent employed must be stoichiometric. The number of epoxy groups and reactive hydrogens of the hardener must be equal, which is the amine molecular weight divided by the number of hydrogens (amine-equivalent weight, AEW) [23]. The curing process and the chemical phenomena of cross-linking are responsible for many of the properties of the solidstate in epoxy derived materials.…”

Section: Resultsmentioning

confidence: 99%

Mechanical characterization of different epoxy resins enhanced with carbon nanofibers

Santos

Maceiras

Valvez

et al. 2020

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

Epoxy with carbon nanofibers (CNFs) are effective nano enhanced materials that can be prepared by easy and low-cost method. The present paper compares the improvements, in terms of flexural and viscoelastic properties, of two epoxy resins reinforced with different weight percentages (wt.%) of CNFs. These epoxy resins have different viscosities, and weight contents between 0% and 1% of CNFs were used to achieve the maximum mechanical properties. Subsequently, for the best configurations obtained, the sensitivity to the strain rate and the viscoelastic behaviour (stress relaxation and creep) were analysed based on international standards. It was possible to conclude that, for both resins, carbon CNFs promote significant improvements in all the studied mechanical properties, even for different contents by weight.

show abstract

Section: Resultsmentioning

confidence: 99%

Mechanical characterization of different epoxy resins enhanced with carbon nanofibers

Santos

Maceiras

Valvez

et al. 2020

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

show abstract

“…Based on the Rehm-Weller equation, the free energy changes (△G el ) for the photoelectron transfer reaction between the excited states of Y-1/Y-2 and IOPF were separately calculated. The reduction potential of IOPF is − 0.653 V [39]. The calculated values of △G el are negative for IOPF/Y-1 and IOPF/Y-2.…”

Section: Absorption Fluorescence Emission Spectra and Cyclic Voltammmentioning

confidence: 86%

Visible light-induced cationic photopolymerization by diphenyliodonium hexafluorophosphate and benzothiadiazole dyes

Liu

Wang

et al. 2020

Polym. Bull.

View full text Add to dashboard Cite

New benzothiadiazole-based long-wavelength organic dyes (Y-1 and Y-2) were prepared for effectively sensitizing diphenyliodonium hexafluorophosphate (IOPF) to initiate the fast curing of bisphenol-A epoxy resin (E51) under visible light, avoiding traditional UV light sources that have high energy and high radiation. Y-1 and Y-2 have absorption spectra extended to more than 550 nm. By using Y-1 and Y-2 as photosensitizers for IOPF, E51 reach high epoxy conversions of 95% under light wavelength of 470-nm irradiation. IOPF and benzothiadiazole dyes present at the same time show good visible-light initiating activity. The high curing conversions are attributed to the photoelectron transfer reaction between diphenyliodonium hexafluorophosphate and benzothiadiazole dyes, based on our photochemical and electrochemical experiments. In addition, the terminated groups or of Y-1 (-F) and Y-2 (-OCH 3) have a great influence on the photopolymerization rate of the curing systems and thermal properties of E51 after cured. In addition, E51 was even polymerized about 70% in the presence of 510-nm light filter.

show abstract

“…They are resistant to alkalis and some inorganic acids, and show good resistance to water and solvents, but are not so resistant to many organic solvents. To increase the curing rate, sometimes a combination of aliphatic and aromatic amines is used [55]. Aromatic diamines are less reactive, and the curing usually stops at the formation of a linear polymer due to the large difference in the reaction of primary and secondary amines [56].…”

Section: Preparation Of Thermosets By Nucleophilic Attack To Epoxy Rementioning

confidence: 99%

The Use of Click-Type Reactions in the Preparation of Thermosets

et al. 2020

View full text Add to dashboard Cite

Click chemistry has emerged as an effective polymerization method to obtain thermosets with enhanced properties for advanced applications. In this article, commonly used click reactions have been reviewed, highlighting their advantages in obtaining homogeneous polymer networks. The basic concepts necessary to understand network formation via click reactions, together with their main characteristics, are explained comprehensively. Some of the advanced applications of thermosets obtained by this methodology are also reviewed.

show abstract

Acceleration of epoxy resin curing by using a combination of aliphatic and aromatic amines

Cited by 33 publications

References 61 publications

Mechanical characterization of different epoxy resins enhanced with carbon nanofibers

Mechanical characterization of different epoxy resins enhanced with carbon nanofibers

Visible light-induced cationic photopolymerization by diphenyliodonium hexafluorophosphate and benzothiadiazole dyes

The Use of Click-Type Reactions in the Preparation of Thermosets

Contact Info

Product

Resources

About