Chemistry Reference
In-Depth Information
CH
2
O
O
O
R
R
+
n
O
O
OR
R
+
n
The new cation can initiate chain growth:
O
R
R
CH
2
+
O
OO O
O
5.7.2 Polymerization of Dioxolane
Polymerization of this cyclic monomer yields polymers that consists of strictly alternating oxymethylene
and oxyethylene units [
76
]. the polymerization reaction can be induced by acidic catalysts, like sulfuric
acid, boron trifluoride,
p
-toluenesulfonic, acid and phosphorous pentafluoride [
76
]:
O
n
O
O
O
n
The polymers of molecular weight 10,000 or higher are tough solids that can he cold drawn. The
following mechanism was proposed for the polymerizations that are initiated by reaction products of
acetic anhydride with perchloric acid [
78
]:
O
O
O
+
+
HClO
4
ClO
4
O
OH
O
Initiation
O
O
O
O
+
O
O
Propagation
O
O
O
O
O
+
O
O
O
O
O
