156 HIGH PERFORMANCE POLYMERS
polymer that precipitatesout as a fine powder. Particles
of the size of0.5–5 µm areproduced by thisprocedure.
This technique is claimed to be far superior to grind-
ing because it is not expensive. Moreover, grinding
produces particles that are much larger in diameter,
namely 15–80 µm.
6.2.2 Electrophilic Process
The electrophilic route for the production of aro-
matic poly(ether ketone)s involves the use of Friedel-
Crafts catalysts. AlCl
3
is used as a catalystfor the poly-
merization of p-phenoxybenzoyl chloride as such, or
p-phenoxybenzoyl chloride or terephthaloyl chloride
and 1,4-diphenoxybenzene to give a PEK. A PEEK
is obtained by the use of p-phenoxyphenoxybenzoyl
chloride, respectively [8]. The process is carried out ...