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15-04-2021 | PHYSICOCHEMICAL MEASUREMENTS | Issue 12/2021

Measurement Techniques 12/2021

Measurement of the Strength and Microstructural Characteristics of Epoxy Polymers Cured by Thermal and Microwave Methods

Journal:
Measurement Techniques > Issue 12/2021
Authors:
E. V. Matveev, A. V. Mamontov, A. I. Gajdar, B. A. Lapshinov, A. N. Vinogradov
Important notes
Translated from Izmeritel’naya Tekhnika, No. 12, pp. 35–41, December, 2020.
Epoxy polymer samples cured by thermal and microwave methods under different temperature-time conditions are studied. The physical and mechanical parameters of the epoxy polymer samples, as well as their microstructure and fractographic fracture patterns, are studied. A tensile test method is used is used to determine the dependence of their strength parameters on the curing regime. Optimal regimes are identified for both curing methods, which makes it possible to obtain samples with maximum strength. Electron microscopy is used for comparative fractographic analysis of the fracture surfaces of samples with similar strength characteristics with thermal and microwave curing. It is found that microwave curing yields an increased globule size and more nanopores, as well as more pronounced local plastic deformation during fracture, and a larger spread in the ratio of the propagation velocities of main and secondary cracks. The dependence of the optical density of the test samples on the thermal and microwave curing regimes is established for wavelengths of 360–2500 nm.

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