Chemistry Reference
In-Depth Information
Me
H
O
(OCH
2
CH
2
O)
(OCH
2
CH
2
O)
x
x
OC
CO
O
Ge
O
+
OCH
(OCH
2
CH
2
O)
(OCH
2
CH
2
O)
x
x
Me
Me
Me
O
CH CO
(OCH
2
CH
2
)
(OCH
2
CH
2
)
CO
CH
O
Me
O
Me
O
Ge
O
CH
CO
(OCH
2
CH
2
)
(OCH
2
CH
2
)
CO
CH
O
+ 2ClCO-(A)-COCl
- GeCl
4
Multiblock poly(ether lactide)s
ClCO
(A)
CO
O
(CH
2
)
5
CO
O
CH
2
CH
2
m
+
ClCO
(A)
CO
O
(CH
2
)
5
CO
O
CH
2
CH
2
n
+
Me
3
SiO
X
OSiMe
3
ClCO-(A)-COCl
CO
(A)
CO
O
(CH
2
)
5
CO
O
(CH
2
)
4
O
CO
(CH
2
)
5
O
n
m
CO
(A)
CO
O
X
O
n
Formula 15.11
trimethylene carbonate. After complete conversion, L-lactide was incorporated
and a cyclic triblock copolyester was obtained [
55
], because no transesterification
occurred.
Polycondensation with sebacoyl chloride yielded the desired multiblock co-
polyester. Such multiblock copolymers consisting of a crystalline ''hard'' block
and an amorphous ''soft'' block show the typical mechanical properties of ther-
moplastic elastomers [
53
,
55
].
