
168 HIGH PERFORMANCE POLYMERS
in the sulfonated PEEK. For fabrication of the final
composites, a simple s olution blending technique can
be used. The materials have a high dielectric constant
above 800, a dielectric loss tangent less than 1.1 at
10 kHz and room temperature.
6.5.9.1 Data Storage
Optical Storage . For the purpose of reversible opti-
cal storage, a hyperbranched PEEK has been devel-
oped. The polymer is terminated with azobenzene
chromophores. 1,3,5-Tris(4-(4-fluorobenzoyl)pheno-
xy)benzene is a core molecule with a functionality
of three, additionally 4,4
-(hexafluoroisopropylidene)-
diphenol is used, and 4-(4-hydroxyphenylazo) ben-
zonitrile ...