1: CARBAZOLE POLYMERS 13
According to the Pockels electro-opticeffect, a bire-
fringence in an optical medium is established by an
applied electric field.The birefringence is proportional
to the electric field, in contrast to the Kerr effect where
the birefringence is quadratic to the field.
1.3.2.6 Fluorescence Quenching
Fluorescence depolarization and quenching mea-
surements of copolymers from NVK and vinyl tert-
butyl-benzoate in dilute solution of several solvents
as well in a rigid PMMA matrix have been performed
[77].
The effect of copolymer composition on the
intramolecular energy transfer between the carbazole
groups along the polymer chain has been studied. The
energytransfer efficiency increaseswith the NVK con-
tent up to a number average sequence ...