The migration of the lubricant stearamide to the surface of vinylidene chloride–acrylonitrile copolymer coatings on regenerated cellulose film was studied by measuring the effect of heating the coatings on friction and critical surface tension. The surface quantity of stearamide was maximum at a heating temperature of 65°C. Above this temperature stearamide was lost from the surface. Up to 65°C the migration of lubricant obeyed first‐order kinetics and the activation energy was calculated. Below 65°C diffusion to the surface appears to be the controlling process, while above 65°C evaporation from the surface is probably the controlling process.
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D.K. Owens (1970) studied this question.
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