Chemistry Reference
In-Depth Information
FIGURE 7.4
The dependence of fractal dimension of chain part between entanglements
D
ch
on entanglements cluster network density n
cl
for PC(1) and PAr (2) [32].
draw ratio l on testing temperature
T
were shown for PC and PAr. The Eq.
(5.7) gives l = const, approximately equal to 6.5, that obviously does not
correspond to the experimental data. The Eq. (7.8) gives the results, cor-
responding to experiment by both dependence l(
T
) course and l absolute
values. Some systematic exceeding of l calculated values in comparison
with the experimental ones is quite natural and reflects all sorts of defects
availability in real samples [39].
Since the ratio (
R
e
/
l
st
) in the Eq. (7.8) represents automodellity coefficient
L [14], equal to C
∞
, then the indicated equation can be simplified as follows
[15]:
D
ch
-
1
l
=
C
∞
,
(7.9)
that at
D
ch
= 2 gives the greatest draw ratio l = C
∞
according to the Eq. (7.5).
