Chemistry Reference
In-Depth Information
FIGURE 13.1
The dependence of PASF films structure fractal dimension
d
f
on solubility
parameters d of solvent, from which a film was prepared [1].
The polymer solubility parameter d
p
value can be determined by its cohe-
sion energy density
W
c
as follows [10]:
d =
W
1/ 2
p
(13.1)
For PASF
W
c
= 385 MJ/m
3
[10], from which d
p
for this polymer is
equal to 9.61 (cal/cm
3
)
1/2
. As it follows from the plot
d
f
(d), adduced in Fig.
13.1, the
d
f
sharp increase occurs at difference absolute value df
p
−d| = |Dd|
growth and the least
d
f
value is reached at the condition d
p
= d (|Dd| = 0) [1].
This allows to obtain the following relationship for considered films value
d
f
estimation [1]:
d
f
= 2.542 + 0.128|Dd|.
(13.2)
to the Eqs. (1.9) and (2.20)) and calculated according to the Eq. (13.2) values
of polymer films structure fractal dimension is adduced.
