Chemistry Reference
In-Depth Information
10
feed
8
gel
6
sol
4
2
0
0,0
0,2
0,4
0,6
0,8
1,0
y
Fig. 9 Distribution of chemical composition at
r
100 in the sol and gel phases, where the feed
distribution is given by (
16
):
solid lines
a
b
4;
broken lines
a
4, b
2
Fig. 10 Fit (
solid line
) of the
experimental feed
distribution [
90
](
squares
)of
EVA copolymer
1,0
0,8
0,6
0,4
0,2
0,0
0
500
1000
1500
2000
2500
3000
r
In order to verify the present theoretical framework, the calculation results are
compared with experimental data. Schirutschke [
90
] carried out phase equilibrium
experiments (critical point, cloud-point curves) of the system EVA + methyl ace-
tate. The distribution of the copolymer was measured using the successive fraction-
ation procedure and determination of the number-average molecular weight of
every obtained fraction. Using this data, the integral distribution function,
I
(
r
),
can be constructed (Fig.
10
) and the parameter of the distribution function with
respect to the molecular weight can be estimated. Fitting of the data given in Fig.
10
results in
r
N
¼
0.758, where the ethylene monomer unit was chosen as
standard. The mass-average chemical composition
y
W
¼
429 and
k
¼
0.375 was measured
