Abstract
Experiments were done on mixed monolayers of polyvinylacetate (PVA) with polymethylmethacrylate (PMMA) and with polyvinylbutyrate (PVB) at the water/air interface at 25°C. The results show that PVA yields ideal bidimensional solutions with PMMA, as previously found, and nonideal solutions with PVB. From the comparison among the corresponding bidimensional state parameters, and, in particular, the spreading thermodynamic functions of the three polymers, it appears that the different behaviors of mixtures may be attributed to the greater polymer-substrate interactions of PVB with respect to PMMA.
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