Chemistry Reference
In-Depth Information
Figure 6.44. The relation of rotational viscosity
η
and molecular weight
Mw
at 600
◦
C.
(Modified from Endo
et al.
, 1992.)
The molecule contains Si-O bonds. FTIR suggested that the Si-O bonds
move when the side groups move. Hence, ferroelectric liquid crystalline
polymers have higher rotational viscosities than small molecular mass fer-
roelectric liquid crystals. In Figure 6.44 the relation of rotational viscosity
η
and molecular weight
Mw
at 600
◦
C is plotted.
η
increases as
Mw
increases
and the quadratic law is observed.
Boemlburg
et al.
(1991) first discovered the anti-ferroelectric liquid crys-
tal phase in the chiral side chain liquid crystalline polymer, S
CA
phase.
Several other research groups followed with more such side chain liquid
crystalline polymers. Boemlburg
et al.
(1992) reported an anti-ferroelectric
liquid crystal in the molecule
∗
(
CH
2
CH
)
*
COO
COO
(CH
2
)
11
O
COO
*
*
Scherwsky
et al.
(1989) first utilized a SSFLC display in terms of the
ferroelectric liquid crystalline polymer. The polymer SSFLC display is fab-
ricated on the ITO-coated plastic substrate. The display was 15
40 cm
2
in
×
area and had 100
300 pixels (Lagerwell, 1993). The display doesn't need
the orientation layer which is essential in the conventional liquid crystal dis-
plays in order to anchor the liquid crystal molecules. By lightly bending the
×
