Chemistry Reference
In-Depth Information
Figure 4.
Influence of comonomer content on TREF elution temperature and percentage soluble fraction.
of R
g
on molecular weight is established
by the scaling law
of the chain. The results obtained for the
parameter
R
g
¼
Q
M
w
.
[29]
Figure 6
shows the plot of R
g
versus M
w
obtained
for the copolymers that were shown in
Figure 1, together with values for poly-
ethylene (NBS 1475) and polypropylene
(PP isotactic), taken as reference.
The slope of the plot provides the q
coefficient which is related with the shape
for all the samples studied
are shown in Table 4. Values of q in the
range 0.5 to 0.6 are typical for linear random-
coil chains.
[30]
A value of
q
0.54 was obtained for
both homopolymers, thus showing a typical
random coil in 1,2,4-TCB. However, the
presence of comonomer decreases the value
q
¼
Figure 5.
Influence of comonomer content on TREF profiles.
