E. Wischerhoff et al., FERROELECTRIC LIQUID-CRYSTALLINE POLYSILOXANES DESIGNED FOR HIGH 2ND-ORDER NONLINEAR SUSCEPTIBILITIES, Macromolecular chemistry and physics, 195(5), 1994, pp. 1593-1602
Ferroelectric liquid crystalline (FLC) copolysiloxanes containing suit
able comonomers (''NLO-chromophores'') for second harmonic generation
(SHG) have been prepared. Their important feature is a donor-acceptor
pi-system sited perpendicular to the long axis of the side-group moiet
ies in order to adopt the polar ordering of the ferroelectric LC phase
. The influcences of the mesogen structure and of the content of NLO-c
hromophores on the liquid crystalline and ferroelectric properties are
studied. The desired chiral smectic C phase is retained up to 30 mol
-% of chromophore. Also, first measurements of second harmonic generat
ion have been performed.