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Wednesday, 18 September 2019
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Raw materials & technologies, Technologies

Efficiency relationship of hyperbranched waterborne polyurethane

Tuesday, 2 February 2016

The rheological behaviour of waterborne polyurethane dispersions (PUD) thickened by hyperbranched waterborne polyurethanes (HWPU) was studied by rheological measurements.

Chinese researchers studied associating thickening mechanisms and structures. Source: r.wagner/pixelio.de

Chinese researchers studied associating thickening mechanisms and structures. Source: r.wagner/pixelio.de

The results showed that the flow activation energy depended on the structure and concentration of HWPU.

Thickening efficiency depended on density of HWPU hydrophobic groups

Based on the relationship between the structure, concentration and flow activation energy, the researchers could infer that during HWPU associating thickening process PUD experienced Duckweed state (appropriate HWPU-latex particles linker), 3D network structure (HWPU-latex particles three-dimensional network) or Bead-like texture (HWPU monomolecular micelles or multi-molecular micelles). The role of interaction between particles in the structure of thickening system was explored by dynamic light scattering, refraction analysis and fluorescence spectroscopy. The combination of hydrophobic groups of HWPU with latex particles resulted in associating thickening, while the intramolecular or intermolecular association of HWPU might lead to a decrease in thickening efficiency or no thickening.

The study is published in: Progress in Organic Coatings, Volume 92, March 2016, Pages 73-79

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