
108 HIGH PERFORMANCE POLYMERS
reaction [8]. The monomer is treated with potassium
carbonate or sodium hydroxide as a base. Copper
chloride is used as a catalyst in an aprotic solvent,
namely, dimethyl sulfoxide or sulfolane. The degrees
of branching reach from 48 to 71%. The phenolic end
groups can be easily modified.
With triphenylphosphine and diisopropyl azodi-
carboxylate, various ether end groups can be
attached, e.g., methoxy groups with methanol, 2-
methoxyethoxy end groups with ethylene glycol
monomethyl ether, etc.
Hyperbranched polymers find applications in rheol-
ogy modifiers,processing additives, and coating appli-
cations as bulk materials, and ...