Based on a solution of expanded polystyrene, the object of the paper is to determine the crack resistance of a coating. It is known that three phases pass through the process of curing polymer coatings. Intensive evaporation of the solvent happens at the first step of coating formation. In the second stage-after approximately 70% of the solvent has been evaporated, intensive growth of internal stresses starts. The concentration of the solvent is decreased in the third stage to a value close to equilibrium and its rate of evaporation reaches zero. Internal stresses are stabilised, with a maximum value reached. The application of 1-4 per cent (by volume) of a plasticizer induces a sharp decrease in internal stresses. It is known, with increasing polymer coating thickness, that internal stresses increase linearly. A mathematical model of the dependency on coating thickness of internal stresses is given.
Author (s) Details
V. I. Loganina
Affiliation Penza State University of Architecture and Construction, Penza, Street Titov, Russia.
S. N. Kislitsyna
Affiliation Penza State University of Architecture and Construction, Penza, Street Titov, Russia.
Y. B. Mazhitov
Affiliation Penza State University of Architecture and Construction, Penza, Street Titov, Russia.
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