Viscosity change of unsaturated polyester-alumina-composites using polyethylene glycol alkyl ether based dispersants

The influence of a series of polyethylene glycol alkyl ether based dispersants on the viscosity of unsaturated polyester-alumina-composites has been investigated systematically. A few correlations between the dispersants molecular structure, the used concentration and the related composite flow properties have been found. In general only the addition of small dispersant molecules with a short hydrophilic anchoring group and an extended hydrophobic tail for improved steric stabilization allows a noticeable viscosity reduction at different concentrations and temperatures.