A study of the orientations of fluorescent molecules incorporated in uniaxially oriented poly(ethylene terephthalate) tapes

摘要: Abstract The theory of the polarized fluorescence from fluorescent molecules incorporated in an oriented solid polymer is developed for a very general model optical behaviour and it concluded that any observed intensity can be expressed terms components fourth rank tensor. Only twelve these are independent samples orthotropic symmetry only six uniaxial symmetry. effects birefringence significant polarization-dependent absorption exciting light on intensities considered. results analysis presented case form which allows values cos 2 θ 4 to calculated experimental measurements intensity. angle between unique axis molecule bars denote averages over sample. has been applied stilbene derivative (VPBO) at concentrations 50–200 ppm poly(ethylene terephthalate) (PET) low crystallinity. It axes VPBO more highly than PET chains, but two distributions orientations appear uniquely related range drawing temperatures (65–90°C) draw ratios (1–5·85) used.