182
L. K. Matkovska et al.
Fig. 11.2 Dependence of the
glass transition temperature
T g on LiClO 4 salt content
[43]
- 20
0
20
40
60
80
0
2 0
4 0
Tg, 0
C
LiClO 4 , phr
O
CH 2
C
H 2
O
C
H 2
C
H 2
O
C
H 2
C
H 2
O
C
H 2
C
H 2
O C
H 2
C
H 2
O-]
O
O-]
C
H 2
C
H 2
O
CH 2
C
H 2
O
C
H 2
C
H 2
CH 2
C
H 2
O C
H 2
CH 2
O-]
Li
Li
O-]
C
H 2
C
H 2
O
CH 2
C
H 2
O
CH 2
C
H 2
O C
H 2
C
H 2
O
C
H 2
C
H 2
O-]
Li
[-O C
H 2
CH 3
+
+
+
Coordinative
bonds
Fig. 11.3 DEG/LiClO 4 composite consists of DEG polymer chains with coordinative bonds
between lithium cations and ether oxygen [44]
to a linear increase of the glass transition temperature from −10 ◦ C to 64 ◦ C.
This can be a result of the electrostatic interactions between lithium cations Li +
and the macromolecular chain of DEG-1 with immediate forming of coordinative
complexes, such as {ether oxygen-lithium cations-ether oxygen} (Fig. 11.3), which
are accompanied by displacement of electron density of the oxygen atoms and their
partial polarization [35]. The result is a substantial reduction of segmental mobility
of DEG-1 chains within the complexes formed that shows up in a glass transition
temperature rise of polymer matrix. The linear dependence of T g on the salt content
testifies that all the lithium ions participate in the formation of coordination bonds.