Chemistry Reference
In-Depth Information
1
cl
/
3
n
FIGURE 6.5
The dependence of forced high-elasticity stress s
p
on parameter
value
for PC [19].
The pointed above discrepancy of the h
o
values, determined by the indi-
cated methods, by two order of magnitude, can be explained easily within
the frameworks of the model [26]. It is easy to see, that the calculation ac-
cording to the Eq. (6.14) was fulfilled in the assumption that polymer is in
glassy state, and the model [26] supposes, that clusters motion is realized in
mechanically devitrificated loosely packed matrix. For the last case elastic-
ity modulus
E
of devitrificated polymer can be estimated according to the
rubber high-elasticity theory [27]:
E = kT
n
e
,
(6.15)
where
k
is Boltzmann constant, n
e
is macromolecular binary hooking's net-
work density, since in devitrificated state cluster decay occurs [28]. The val-
ue n
e
for PC is accepted according to the data of Ref. [29] and in this case
E
≈ 1.82 GPa at
T
= 293 K [19].
The stress s for such devitrificated loosely packed matrix can be esti-
mated according to the following fractal relationship [30]:
s l
-
(
)
2
2,5
=
-
,
(6.16)
2, 5
