Pigmented inks for inkjet printers, which consist of a solid coloured pigment dispersed in a solvent are a product in increasing demand worldwide. The stringent requirements on inks in terms of long lifetime and tolerance of a broad spectrum of stora~e conditions, as well as careful control over viscosity and wetting behaviour makes the formulation of stables inks challenging. To assist with designing successful ink dispersions, two polymers designed to act as dispersants for pigment were investigated. The focus of the investigation was to understand the adsorption behaviour of the polymers on to pigment surfaces, and how chemical factors affected this. To this end, the adsorption of polymers to a variety of surfaces was investigated, as were solution characteristics that could alter the effectiveness of the polymers as dispersants. The dispersant polymers were found to have a molecular weight of the order of 105 and to be negatively charged at high pH. When the charge was screened or neutralized then the polvrners would precipitate from aqueous solution. The dispersant polymers were found not to adsorb to the majority of surfaces investigated, including both charged and uncharged hydrophilic and hydrophobic surfaces, however they were found to adsorb to the organic, uncharged, hydrophobic polystyrene, suggesting they would be suitable for use stabilizing organic pigments.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:578558 |
| Date | January 2011 |
| Creators | Lincoln, Alexander |
| Publisher | University of Leeds |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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