Mixed monolayers of polymethyl methacrylate and polyethyl methacrylate at several temperatures

Abstract

The behavior of mixtures of polymethyl methacrylate and polyethyl methacrylate in the bidimensional state at several temperatures is studied. The spreading isotherms are distinctly different at 30°C than at 20 and 25°C. At 30°C a first order transition between a gaseous state and a liquid state is present in all the spreading isotherms of the mixtures and of polyethyl methacrylate alone, except for mixtures having a 1 1 molar ratio. This mixture which is the most stable even at low temperature, can be considered to be a mixture having characteristic surface properties and high spreading entropy and enthalpy values.