ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Importance of Chemomechanical Processes for the Applications of Biaxially Oriented Polypropylene Films in Power Capacitors. I. Phenomenological Model of Interaction

J. Polakovič

Department of Physical Chemistry, Faculty of Chemical Technology, Slovak University of Technology, SK-812 31 Bratislava

E-mail: polakovi@chtf.stuba.sk

Abstract: The chemomechanical processes between the liquid dielectric and the biaxially oriented polypropylene (BOPP) film have been studied by means of measurement of dimension changes of the film by this interaction. The dimension changes are caused by the change of state parameters (physical and chemical conditions) during the interaction, If specific potential φ_L^S for molecules of liquid dielectric L in BOPP film, i.e. in solid phase, is greater than the chemical potential of molecules of liquid dielectric μ_L, i.e. in liquid phase, the molecules of liquid dielectric do not penetrate into the solid phase (BOPP film) and no dimension change is observed. Thus a high-quality power capacitor is produced. If this condition is not obeyed, the dimension changes may cause formation of vacancies, which consequently deteriorate the quality of power capacitor. On this basis a phenomenological model describing the interaction has been devised as a result of 400 measurements of dimension changes. The application of this model is demonstrated.

Full paper in Portable Document Format: 551a1.pdf

Chemical Papers 55 (1) 1–6 (2001)