oven. The chemical structures relevant to this synthetic route are shown in
Scheme 4. As shown in Table 3, the inherent viscosity of PAM was found to be
0.77–0.87, as measured at 30
C at a concentration of 0.1 g/dL in solution in
sulfuric acid.
Table 2 General properties of OBDT hybrids with various organoclay contents
C18-MMT
wt%
I.V.
a
T g
C
T m
C
T i
C
LC phase
0 (pure OBDT)
0.82
110
283
316
Nematic
1
0.79
133
289
324
Nematic
3
0.71
113
283
313
Nematic
5
0.8
113
282
309
Nematic
7
0.55
112
297
–
n.o.
b
a Inherent viscosities were measured at 30
C using 0.1 g/100 mL solutions in a p-chlorophenol/
1,1,2,2-tetrachloroethane (w/w = 50/50) mixture
b
Not observed
1) Synthesis of monomer
2) Organoclay
3) Synthesis of OBDT hybrid
HO
OH
COC 2 H 5
H13C 6 O
O
O
COH
OC 6 H 13
HOC
O
O
O
O
H 5 C 2 OC
H 13 C 6 O
H 13 C 6 O
H 5 C 2 OC
COC 2 H 5
OC 6 H 13
ClC
CCl
OC 6 H 13
O
O
H 13 C 6 O
H 13 C 6 O
ClC
CCl
OC 6 H 13
O
O
O
O
O
n
C
CO
OC 6 H 13
NaOH
1-Bromohexane
MMT
; C18-MMT
OBDT hybrid
C18-MMT
pyridine
- HCL
C18-MMT
+
+
O H
HO
CH 3 (CH 2 ) 17 NH 3
SOCl 2
K 2 CO 3 /DMF
HCL
Scheme 3 Synthetic routes for the OBDT hybrid
586
T. Y. Ha et al.