Colloid and Polymer Science

, Volume 278, Issue 12, pp 1164–1171 | Cite as

Preparation of waterborne dispersions of epoxy resin by the phase-inversion emulsification technique. 1. Experimental study on the phase-inversion process

  • Z. Z. Yang
  • Y. Z. Xu
  • D. L. Zhao
  • M. Xu
ORIGINAL CONTRIBUTION

Abstract

 Waterborne dispersions of bisphenol A epoxy resin were prepared by the so-called phase-inversion emulsification technique. The electrical properties, rheological behavior and morphological evolution during the phase inversion process were characterized systematically. It was shown that both emulsifier concentration and emulsification temperature play great roles in controlling the phase inversion process as well as the structural features of the waterborne particles. A high emulsifier concentration, i.e. 10.90 wt% and a low emulsification temperature, i.e. 73 °C, facilitate complete phase inversion, in which all water droplets in the system are simultaneously transformed into the continuous phase at the phase-inversion point (PIP). In this case, sub-micron-sized, discrete waterborne particles were formed. In contrast, a complex water-in-oil-in-water structure was achieved by incomplete phase inversion at a low emulsifier concentration, i.e. 2.33 wt%, and a high temperature of 80 °C. The morphological evolution observed by scanning electron microscopy revealed that not all the water droplets in the system were converted into the continuous phase at the PIP and that some small water drops were trapped within the waterborne structure.

Key words Bisphenol A epoxy resin Waterborne dispersions Phase-inversion emulsification Electrical properties Rheological behavior 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Z. Z. Yang
    • 1
  • Y. Z. Xu
    • 1
  • D. L. Zhao
    • 1
  • M. Xu
    • 1
  1. 1.State Key Laboratory of Polymer Physics and Chemistry Center for Molecular Science Institute of Chemistry The Chinese Academy of Sciences Beijing 100080, China e-mail: yangz@pplas.icas.ac.cn Fax: +86-10-62559373CN

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