Chemistry Reference
In-Depth Information
Nomura and coworkers [
100
] studied copolymerization of ethylene with various pentenes:
;
;
;
etc.
n
where
8, 12. The polymerizations were carried out with titanium catalysts illustrated below.
Titanium compound were combined with methyl aluminoxane:
n ΒΌ
Cl
Ti
Ti
Cl
O
Cl
Cl
N
Their results show that the monomer reactivities are influenced not only by substituents on the
olefins but also by the nature of the catalytically active species.
Derlin and Kaminsky [
101
] reported copolymerizations of ethylene and propylene with a sterically
hindered monomer, 3-methyl-1-butene, using titanium and zirconium metallocenes with methyl
aluminoxane cocatalyst.
Tritto and coworkers [
102
] reported that the complex [Pd(k
2
-P,O-{2-(2-MeOC
6
H
4
)
2
P}C
6
H
4
SO
3
)
Me(DMSO)] was investigated as a single-component catalyst for the copolymerization of ethylene
with norbornene. The catalyst was illustrated as follows:
O
P
O
Pd
O
SO
O
S
O
The copolymers were obtained in very good yields and molar masses were significantly higher
than those of polyethylene. Three copolymers were formed:
n
m
n
m
n
m
OH
OAc
