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= ~1600) in sodium acetate buffer for 6 h at 40-45
°
C (Fig. 8.1a)
1
H NMR spectrum of the employed mixture of the guest
polyethers (CDCl
[1,2]. The
) showed that the unit ratio of POXT/PTHF in feed
was assessed to be 0.90:1.00 (Fig. 8.2a). However, in the
3
1
H NMR
spectrum of the product obtained by the vine-twining polymerization
(DMSO-
), the signals due to PTHF and amylose were prominently
observed and the signal due to POXT slightly appeared (POXT/PTHF
= 0.02:1.00) (Fig. 8.2b). When POXT or PTHF was independently
used as the guest for the vine-twining polymerization, the inclusion
complex was formed well as described in Chapter 7 [3]. These
results indicated that amylose almost selectively included PTHF
from a mixture of the two resemblant polyethers in the vine-twining
polymerization. The slight difference in the hydrophobicities of
two polyethers probably caused the difference in the inclusion by
amylose toward them.
d
6
(a) Mixture of polyethers
Amylose
H
OH
Vine-twining
polymerization
O
n
PTHF
H
OH
+
O
Glc
7
Glc-1-P
Phosphorylase
n
H
O
OH
n
POXT
"Amylose almost selectively includes PTHF"
(b) Mixture of polyesters
O
H
O
O
O
O
H
n
m
O
PCL
+
O
H
O
O
O
H
O
m
n
O
PVL
Amylose
Vine-twining
polymerization
O
O
O
H
H
O
O
Glc
7
Glc-1-P
Phosphorylase
m
n
O
"Amylose selectively includes PVL"
Figure 8.1
Amylose selectively includes one of the two resemblant
polyethers (a) and one of the two resemblant polyesters (b) in
vine-twining polymerization.
