Chemistry Reference
In-Depth Information
be taken into account by additional probability of bonds formation h
x0
=
constant, determined as follows [24]:
n
h
x0
=
S
,
(3.15)
x
where
n
x0
is density of macromolecular binary hooking network per sam-
ple cross-section, but not per volume, as the value nl
l
is usually determined.
Therefore, between indicated parameters the approximate relationship exists
[21]:
2
e
/
3
n
≈
n
.
(3.16)
x
0
The comparison of the calculated according to the Eq. (3.14) at the con-
dition h
x
= j
cl
+ h
x0
E
T
and experimental
E
elasticity moduli values have
shown their good correspondence (their mean discrepancy < 15%). At the
greatest from the used testing temperatures
T
= 353 K the value ET
T
proves to
be higher than on
E
about 40%. It is supposed [21], that this effect is due to
large enhancement of chains slippage through macromolecular binary hook-
ing at the increased temperatures, when they cannot be transferred load [27].
The calculation according to the Eq. (3.14) at h
x
= j
cl
gave an excellent cor-
respondence between
E
and
E
T
at
T
= 353 K [21].
KEYWORDS
•
elasticity modulus
•
excess energy localization
•
Kolraush equation
•
polymer
•
relaxation
•
thermal cluster
REFERENCES
1. Bergman, D. L., & Kantor, Y. (1984)
.
Critical
Properties
of
an
Elastic
Fractals
.
Phys.
Rev. Lett.,
53(6)
, 511-514.
2. Sokolov, I. M. (1986)
.
Dimensions
and
Other
Geometrical
Critical
Exponents
in
Percola-
tion
Theory
.
Uspekhi Fizicheskikh Nauk,
150(2)
, 221-256.
