Monolayers of polyvinyl acetate

Abstract

In order to compare the orientation and the energies of polyvinyl acetate at the interphase W A with the corresponding properties at the interphase W O , the spreading isotherms at the two interfaces are reported. From the comparison of virial coefficients of bidimensional state equations with those of equations theoretically deduced, and from the values of the thermodynamic spreading properties, we have demonstrated that at the interface W A the macromolecule lies as a deformed coil with moderate flexibility and with rather low attractive energies. In contrast, at the interphase W O the cohesion energies can be considered negligible.