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Rheological properties of filled gels. Influence of filler matrix interaction

  • Polymer Science
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Abstract

The dynamic moduli of gels filled with particles have been studied as a function of the volume fraction of dispersed particlesϑ f (0–0.4) and of the way in which they interact with the gel matrix. Two gels of different nature were studied, viz. polyvinyl alcohol (PVA) — Congo red gels (a so-called rubber gel) and casein gels made by acidification of skimmed milk. Emulsion droplets stabilized by different macromolecules have been used as dispersed particles. If there was no interaction between the macromolecules adsorbed on the particles and the gel matrix, both the filled PVA and the filled casein gels showed a small decrease in the elastic moduli withϑ f , approaching the behaviour theoretically predicted for foams. In the case of interaction, the results for filled PVA gels roughly fitted the theoretical predictions, if the deformability of the emulsion droplets and the formation of an intermediate layer between the dispersed particles and the gel matrix was taken into account. The increase in the elastic moduli of the acid milk gels withϑ f was much greater than expected and was probably due to aggregation of the dispersed particles during gelation.

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  1. T. van Vliet

    Present address: Department of Food Science, Wageningen Agricultural University, Wageningen, the Netherlands

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    van Vliet, T. Rheological properties of filled gels. Influence of filler matrix interaction. Colloid & Polymer Sci 266, 518–524 (1988). https://doi.org/10.1007/BF01420762

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    • DOI: https://doi.org/10.1007/BF01420762

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