Change in Molecular Orientation during Thin Film Growth by Evaporation of Copolymer of Vinylidene Fluoride (80%) and Tetrafluoroethylene (20%)

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Abstract
Thin film with an orthorhombic-type polymorph was prepared by evaporating a copolymer of vinylidene fluoride and tetrafluoroethylene powder on Ag-coated glass substrate. The molecular orientation is studied by determining the thickness dependence of the vibration absorption in the film when the p-polarized infrared rays are incident at an angle of 70°. On the substrate held at 80°C, the regions with the main chain aligned parallel to the surface becomes larger than those on nonheated substrate. This is probably due to some structural relaxation which is caused by the encounter of admolecules with each other and/or with the incoming molecules.