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Influence of the Chemical Composition of an Epoxy Resin and of Its Filling with Nanoparticles of Iron, Aluminum, and Their Oxides on the Enthalpy of Curing with m-Phenylenediamine

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Abstract

Curing of ED-20, DEG-1, KDA-2, and PEF-3A epoxy resins with m-phenylenediamine at different ratios of the curing agent and resin was studied by differential scanning calorimetry. The enthalpy of cross-linking linearly increases with increasing m-phenylenediamine content until the stoichiometric ratio between the amino and epoxy groups is reached, after which it does not change further. The enthalpy of the elementary step of the reaction between the epoxy and amino groups was determined. The enthalpy of curing at the stoichiometric and superstoichiometric ratio of the curing agent to the resin is proportional to the epoxy number of the resin. This relationship can be used for determining the epoxy number in specific process systems. The effect of adding nanosized fillers (nanoparticles of Fe, FeOх, Al, and Al2O3) on curing of filled polymer epoxy composites based on ED-20 was studied. The thermal effect of curing is independent of the presence of filler nanoparticles in the composites. On the other hand, introduction of nanoparticles decreases the temperatures of the onset, maximum, and end of the curing reaction, i.e., activates the cross-linking. The extent of the reaction acceleration increases with an increase in the specific surface area of the nanoparticles.

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Funding

The study was financially supported by the Russian Science Foundation (project 20-12-00031)

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Authors and Affiliations

  1. Ural Federal University, ul. Mira 19, 620002, Yekaterinburg, Russia

    K. O. Il’inova, A. P. Safronov & I. V. Beketov

  2. Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, ul. Amundsena 106, 620216, Yekaterinburg, Russia

    A. P. Safronov & I. V. Beketov

Authors
  1. K. O. Il’inova
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  2. A. P. Safronov
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  3. I. V. Beketov
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Correspondence to K. O. Il’inova.

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Translated from Zhurnal Prikladnoi Khimii, No. 8, pp. 1023–1030, January, 2021 https://doi.org/10.31857/S0044461821080089

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Il’inova, K.O., Safronov, A.P. & Beketov, I.V. Influence of the Chemical Composition of an Epoxy Resin and of Its Filling with Nanoparticles of Iron, Aluminum, and Their Oxides on the Enthalpy of Curing with m-Phenylenediamine. Russ J Appl Chem 94, 1072–1079 (2021). https://doi.org/10.1134/S1070427221080085

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