
94 HIGH PERFORMANCE POLYMERS
3.5.8 Ink-Jet Printing
Ink-jet printing has been used here as a precise
and fast dispensing technique for the preparation of
thin-film libraries of a copolymer from phenylene-
ethynylene and phenylene-vinylene [171].
As side chains, octyl and octadecyl groups were
used. These side chains improve the solubility and
further they reduce the effect of π-stacking [172].
The basic structure of the copolymer is shown in
Figure 3.25.
The films were prepared under a systematic vari-
ation of the ink composition, the dot spacing, and
the substrate temperature. Homogeneous films with
a thickness of 100 nm were obtained when printed
at room