Phosphated polyurethane–acrylic dispersions: synthesis, rheological properties and wetting behaviour

Phosphated polyurethane–acrylic dispersions were prepared by a new method that is free from organic solvents and requires a very low dispersion force. After the carboxylic acid groups of the phosphated polyurethane were neutralised by suitable bases, water was added to form the phosphated polyuretha...

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Bibliographic Details
Published in:Polymer (Guilford) 2002-09, Vol.43 (19), p.5341-5346
Main Authors: Mequanint, K, Sanderson, R, Pasch, H
Format: Article
Language:English
Subjects:
Applied sciences
Copolymerization
Exact sciences and technology
Organic polymers
Particle size
Phosphated polyurethane–acrylic dispersions
Physicochemistry of polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
Rheological properties
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Summary:Phosphated polyurethane–acrylic dispersions were prepared by a new method that is free from organic solvents and requires a very low dispersion force. After the carboxylic acid groups of the phosphated polyurethane were neutralised by suitable bases, water was added to form the phosphated polyurethane seed dispersion. Polyurethane–acrylic dispersions were obtained from the phosphated polyurethane seed by emulsion copolymerisation. The polyurethane seed polymer was found to be stable over the initiator concentration used and the rheological properties of the polyurethane acrylics were found to follow Newtonian behaviour under the prescribed experimental conditions. This is a good indication that the dispersions may be used as pigment wetting media. The dynamic contact angle study showed the poor wettability of the phosphated polyurethane–acrylic dispersion films, indicating good hydrophobicity.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(02)00367-1