Table 4 Ethylene polymerization by typical diiminonickel halides
Pre-catalyst
a
Co-catalyst Al/Ni Pressure (atm)
T (
C) Time (min) Activity
b
T m
c
(
C) Mw
d
(10
5
g mol
À1
) Mw/Mn
e
Brch
f
References
Type X R
1
R
2
9A
Br
iPr H MAO
10 1
0
30
5.06
122
1,400
2.3
5
[9]
9A
Br
iPr H MMAO
2,000 14
35
10
67.2
110
337
1.8
24
[17]
9B
– –
–
MAO
3,000 14
35
10
Trace
–
–
–
–
[80]
9B
– –
–
Me
2 AlCl
3,000 14
35
10
0.016
131
56.4
2.2
3.6
[80]
9C
Br
iPr H Et
2 AlCl
600 10
20
30
10.9
49.1
942
2.7
–
[81]
9C
Br
iPr H MAO
3,000 10
20
30
9.39
62.7
745
2.5
–
[81]
9D
Br Me H MAO
2,000 1.2
0
60
1.58
124.9
195
5.9
7.0
[84]
9E
Cl Me Me EASC
400 10
40
30
4.41
99.9
2.01
2.1
32
[85]
9E
Cl Me Me MAO
1,500 10
40
30
3.43
116.2
3.49
2.3
35
[85]
9E
Br Et Me EASC
300 10
40
30
3.63
107.5
3.87
2.1
33
[85]
9E
Br Et Me MAO
1,000 10
40
30
3.53
115.8
7.33
2.2
29
[85]
EASC ethylaluminium sesquichloride,
MAO methylaluminoxane,
MMAO modified methylaluminoxane
a
See Scheme 9
b
10
6
g (PE) mol (Ni)
À1
h
À1
c
Melting temperature, as determined by DSC
d
Molecular weight, as determined by GPC
e
Polydispersity, as determined by GPC
f
Branches every 1,000 carbons, as determined by FT-IR
Novel Polyethylenes via Late Transition Metal Complex Pre-catalysts
175