The rate of diffusion of ethyl acetate (EtAc) in poly (vinylidene fluoride) (PVF 2 ) has been monitored using a newly developed rheo-photoacoustic Fourier transform infra-red technique. The rate depends on the degree of applied strain, the structural changes occurring during the polymer plastic deformation, the concentration of EtAc in PVF 2 as well as the morphology of the polymer. These relationships are discussed in terms of the fractional free volume (FFV) theory of transport properties in polymers. The data indicate that for larger FFV, the rate of diffusion increases. Furthermore, the elongations at which plastic strain reaches a maximum, the changes that occur during plastic deformation and the difference between relaxed and non-relaxed plastically deformed films can be determined using specially designed rheo-photoacoustic Fourier transform infra-red apparatus.
Посилання на статтю:
The mobility of ethyl acetate in poly (vinylidene fluoride) : rheo-photoacoustic Fourier transform infra-red studies / Bret W. Ludwig and Marek W. Urban // Polymer. – 1992. – Vol 33. – P. 3343-3350.