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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

Russian Journal of Applied Chemistry, ISSN: 1608-3296, Vol: 94, Issue: 8, Page: 1072-1079
2021
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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, FeO, Al, and AlO) 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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