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Cross-section optical images of (a) epoxy resin composite without additives, (b) composite containing 2 phr of naringenin, (c) composite containing 4 phr of naringenin, and (d) composite containing 8 phr of naringenin. 1—glass fabric; 2—graphite flakes; 3 and 4—APP powder uneven distribution; 5—naringenin inclusions; 6—APP deconcentration; 7—naringenin concentrations; 8—aggregations of APP and naringenin. All images obtained at magnification of 200×. phr means parts per hundred resin.
