Chemistry Reference
In-Depth Information
60
50
40
30
20
10
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
y
Fig. 22 Simulation results for the Baker Williams column according to the chemical composi
tion, where the original polymer has a two dimensional distribution according to (
16
)
1,0
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0,0
0
100
200
300
400
500
600
700
800
r
Fig. 23 Simulation results of the Baker Williams column for a copolymer having a distribution
according to (
15
), where the
symbols
show the fractionation data and the
line
represents the
original distribution
given in (
16
). Again, the application of a BW column leads to a strong improvement
in the fractionation effectivity in comparison with the stepwise methods.
The high fractionation effectivity allows correct estimation of the initial copoly-
mer distribution (
15
) according the molecule weight if only five fractions are
formed (Fig.
23
). Copolymers distributed according to the Stockmayer distribution
function (
15
) are characterized by a relatively small polydispersity with respect to
the chemical composition. In contrast, copolymers showing a distribution given in
