Chemistry Reference
In-Depth Information
Elastic constants
K
11
(
×
10
−
12
N) of some important liquid crystals.
Table 6.1.
Chemical composition
K
11
K
22
K
33
6.05
3.62
10.10
R
COO
CN
6.25
3.16
8.70
R
CH
N
CN
6.70
3.60
9.00
R
CN
5.15
3.10
6.40
RO
CN
5.50
3.16
8.50
CN
R
H
COO
6.75
3.30
10.50
CN
R
H
4.90
3.14
7.00
O
O
R
CN
7.00
3.86
8.10
N
N
CN
R
6.20
3.43
7.95
OR'
R
H
COO
7.95
3.89
6.75
O
O
R
OR'
____________________________________________________________________
the splay-deformed domain have to be segregated, as shown in Figure 6.2,
otherwise, a gradient of density must accompany the splay deformation
·
∇
ρ
ρ
∇·
n
=
−
n
,
(6.1)
where
ρ
is the density of rod-like liquid crystalline polymer chains
penetrating the plane normal to the directors. As a result the density in
