Chemistry Reference
In-Depth Information
60
50
40
30
20
10
0
0
4
8
12
16
20
Reaction time (h)
Figure 9.16 Change of MFI of the graft product with reaction time under a weight
ratio of i-PP/MA/BPO
¼
100/2/1.
Reprinted from ref. 26 with permission of John Wiley & Sons.
1.4
100
1.2
80
1.0
60
0.8
0.6
40
0.4
20
0.2
0.0
0
012345678
MA (wt%)
Figure 9.17 Effects of MA content on graft degree (
J
) and yield (
&
) of the graft
product with BPO
¼
1.0 wt%. For comparison, the degree (
K
) and yield
(
'
) from melt mixing (190 1C, 75 rpm, and 15 min) are also shown.
Reprinted from ref. 26 with permission of John Wiley & Sons.
with increasing MA amount. Such a decrease in the graft yield, which is also
observed in the melt grafting,
33
has been attributed to formation of a two-
phase system of i-PP in the melt state and MA in the liquid state, which
causes a greater loss of BPO with an increasing content of the MA phase.
34
Accordingly, the graft degree exhibits a maximal value of 1.3 wt% at an MA
amount of 3.0 wt%.
Figure 9.18 presents the dependence of the graft yield on the initial
amount of BPO for an MA amount of 2.0 wt%. The graft yield increases
with increasing amount of BPO up to 1.0 wt%, attaining a plateau of 70%
for Z1.5 wt% BPO. A similar relation is also observed with a greater amount
of MA (5.0 wt%), even though the smaller rate for BPO up to 2 wt% results in
a smaller maximal graft yield of 50% for Z3.0 wt% BPO.
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