Chemistry Reference
In-Depth Information
2
d
(5.5)
n =
p
f
FIGURE 5.1
The relation between local plasticity zone length h
p
and clusters relative
fraction j
cl
in double logarithmic coordinates, corresponding to the Eq. (5.4) for HDPE (1)
and PS (2) [10].
Thus, the value n
p
receives the clear physical significance. The estima-
tion of
d
f
according to the Eq. (5.5) gives magnitude ~2.63, that corresponds
well to magnitudes
d
f
, obtained by other methods [1].
Let us note, that index n
p
characterizes that part of percolation system,
which surrounds percolation network [18]. In respect to polymer this means,
that index in
p
characterizes loosely packed matrix, in which entire free vol-
ume is concentrated [19]. Hence, as it was to be expected, local plasticity
zone formation is connected with polymer structure loosely packed com-
ponent and its free volume. Let us note, that combination of the Eqs. (5.4)
and (5.5) demonstrates the typical example of usage necessity for polymers
structure and properties description, as a minimum, of two order parameters.
In the considered case j
cl
and
d
f
are these order parameters.
