Chemistry Reference
In-Depth Information
Li and Turner [
185
], reported copolymerization of maleic anhydride with
trans
-stilbene:
O
R
1
O
R
1
O
THF
AIBN
+
O
R
2
R
2
n
O
O
R
3
R
3
where, R
1
,R
2
, and R
3
are either methyl groups or hydrogens
The stability of charge-transfer complexes depends upon internal resonance stabilization. This
degree of stabilization determines how easily the diradicals open up [
183
]. Consequently, the stability
also determines how the copolymerization occurs. It can occur spontaneously, or under the influence
of light or heat, or because of an attack by an initiating free radical.
There are many examples of spontaneous reactions. When, for instance, isobutylene is added to
methyl
-cyanoacrylate, a spontaneous copolymerization in a 1:1 ratio takes place at room tempera-
ture. This was explained by the following scheme [
175
,
181
-
183
]:
a
O
N
OCH
3
OCH
3
+
N
O
OCH
3
OCH
3
O
O
n
N
N
40
C[
184
].
The same happens when sulfur dioxide is added to bicycloheptene at
SO
2
SO
2
+
donor
acceptor
O
SO
2
S
n
O
