Chemistry Reference
In-Depth Information
Living metathesis type polymerization was also employed to form block copolymers from
norbornene and its derivative with bimetallic ruthenium catalysts, (PR
3
)
2
Cl
2
Ru(
¼
CH-
p
-C
6
H
4
CH
¼
)
RuCl
2
(PR
3
)
2
[
434
]. This can be illustrated as follows [
434
]:
PCy
3
H
Cl
Ru
C
O
Cl
+
PCy
3
PCy
3
2n
Cl
C
Ru
O
H
Cl
N
PCy
3
CH
3
O
PCy
3
H
H
PCy
3
Cl
Cl
Ru
O
O
C
C
Ru
Cl
n
n
Cl
PCy
3
PCy
3
O
O
O
O
N
N
CH
3
CH
3
+
2m
CH
2
Cl
2
RT
30 min.
R
R
H
H
O
O
C
C
m
n
m
n
O
O
O
O
N
N
R
R
R
R
CH
3
CH
3
Pitet and Hillmyer [
436
] formed triblock copolymers from 1,5-cycloocatadiene and
DL
-Lactide by
combining ring opening metathesis polymerization with cyclic ester ring opening polymerization.
1.ROMP
+
AcO
OAc
2. Hydrolysis
O
O
HO
O
O
OH
n
3 ROP
O
H
O
O
O
O
H
2n
O
Proto et al. [
434
] living isoselective coordination polymerization of styrene to form isoselective
block copolymers. This was accomplished by sequential monomer addition.
