Chemistry Reference
In-Depth Information
cr
s
and non-
Let us estimate now determination methods of crystalline
nc
s
regions contribution to yield stress s
Y
of semicrystalline
polymers. The value
crystalline
cr
s
can be determined as follows [96]:
1/ 2
Gb
K
S
,
(4.59)
cr
Y
s
=
2
p
where
b
is Burgers vector, determined according to the Eq. (4.7),
K
is crys-
tallinity degree,
S
is cross-sectional area, which is equal to 14.35 and 26.90
Å
2
for HDPE and PP, accordingly [97].
FIGURE 4.23
The dependence of elasticity modulus
E
on strain rate
e
in logarithmic
coordinates for HDPE (1) and PP (2) [93].
FIGURE 4.24
The dependences of elasticity modulus
E
on fractal dimension of structure
d
f
for HDPE (1) and PP (2) [93].
