Geometric control of inkjet printed features using a gelating polymer
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van den Berg, Antje M. J.; de Laat, Antonius W. M.; Smith, Patrick J.; Perelaer, Jolke; Schubert, Ulrich S.
- Abstract:
- When an inkjet printed feature is formed, the behaviour of the ink on the substrate is of great
importance. In order to investigate the possibility of increased control over the as-printed feature
on a substrate, a TiO2 ink was formulated that gels above a certain temperature. The TiO2
particles in the ink are colloidally stabilised by an adsorbed layer of poly(vinyl methyl ether)-
block-poly(vinyloxy-4-butyric acid) diblock copolymer. The thermal gelation, at about 37 uC, is
due to the limited solubility of the poly(vinyl methyl ether) buoyant block in the continuous
medium of the ink. Drops and lines with improved morphological control and resolution were
achieved using the thermal gelation effect. Lines printed using this approach did not display
deviations at their starts and ends; and bulges in the line could be avoided. Finally, defect-free
straight lines could be printed on very hydrophobic surfaces, which is impossible with regular inks
due to the de-wetting nature of such substrates.
- Year:
- 2007
- Type of Publication:
- Article
- Journal:
- Journal of Materials Chemistry
- Volume:
- 17
- Pages:
- 677 - 683