This thesis contains a comprehensive investigation into the interactions of combinations of cationic polyacrylamide polymers of varying charge density and molecular weight and six microparticles of varying size, shape and type, with two papermaking fillers (one kaolin and one precipitated calcium carbonate). The interaction and adsorption behaviour of the polymers with the microparticles and fillers were determined by back polyelectrolyte titration using a streaming current detector to determine the end point. The flocculation of these fillers with the polymers and combinations of the polymers and microparticles was monitored in real time with a Photometric Dispersion Analyser. Modification of the commercially available machine to allow the study of fibre containing papermaking furnishes has been made and is described. Detailed characterisation of the resultant floes has been undertaken by Coulter Laser Sizer and photographic means. The drainage behaviour of the floes and the flocculated furnish has been investigated and the filler retention levels measured. Mechanisms to describe the behaviour of these microparticle retention systems have been proposed.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:617001 |
| Date | January 2001 |
| Creators | Burgess, Michael S. |
| Publisher | University of Manchester |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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