Abstract
In order to establish a measurement for surface orientation of polymers, the fluorescence polarization method was applied for orientation analysis of fluorescent molecules vacuum-deposited on a polymer surface. The deposition behavior was also investigated. 1,6-Diphenyl-1,3,5-hexatriene (DPH) was deposited on the surface of poly(vinyl chloride) (PVC) films. The orientation behavior of DPH on vacuum-deposition was examined by the polarization of fluorescence emitted from DPH. When a DPH molecule was introduced onto the surface of PVC films, the orientation was found to be three-dimensionally random. After these fluorescent films were drawn above Tg, the surface orientation of the polymer chains was estimated by the dichroism of DPH, which was analyzed from the polarized components of fluorescence intensity. This system was compared with the DPH doped system in which DPH was distributed wholly in bulk. It was found that the orientation of DPH on the surface was slightly higher than that in the bulk. This slightly higher orientation in the polymer surface was also confirmed by birefringence measurements. The DPH was also vacuum-deposited onto some drawn PVC films. The orientation of DPH was higher on the film surface deposited after drawing than before drawing.
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Ohmori, S., Ito, S., Onogi, Y. et al. Fluorescence Method for Studying Surface Orientation of Polymer Film Using Vacuum-Deposition Technique. Polym J 19, 1269–1278 (1987). https://doi.org/10.1295/polymj.19.1269
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DOI: https://doi.org/10.1295/polymj.19.1269