The measurement of the complex dielectric constant (ϵ = ϵ′- j ϵ″) in the dipolar absorption domain of the “free” water molecule (microwave region) makes it possible to follow quasi specifically and precisely the water circulation and its interactions with any latex. Weight and dielectric constants variations were simultaneously recorded during water evaporation, which, occurring in a latex, led to particle coalescence and film formation. The influence of the glass transition temperature of polymers, the particle size distribution, the medium ionic strength and emulsifier in a latex were studied.
