Abstract:
Using electron microscopy, the phase separation in polymer composite coatings obtained on tinplate by thermal curing of an equimolar mixture of epoxy (EO) and phenol-formaldehyde (PO) oligomers in ethylcellosolve was studied, while varying the amount of orthophosphoric acid that chemically interacts with EO and PO. The conditions for the formation and characteristics of the spinodal architecture of epoxyphenol compositions, which are clusters of two interconnected phases enriched with EO and PO curing products, respectively, are discussed. It has been shown that the spinodal decomposition of a mixture containing EO in the form of monophosphates can initiate the formation of an internal percolation cluster of cross-linked EO molecules in the composition. The fractal microstructure provides high adhesion strength and chemical resistance to the coating.
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