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Process intensification in particle technology: flow induced phase inversion in the intensive emulsification of epoxy polymer melts in water

Lookup NU author(s): Professor Galip Akay

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Abstract

The flow induced phase inversion phenomenon is applied to the phase inversion emulsification of high molecular weight epoxy polymer melt to obtain sub-micron particles. It is found that molecular surfactants could not be used to obtain the initial [water-in-polymer melt] emulsion. Polymeric surfactants, hydrophobically modified water soluble polymers have to be used for this purpose. The molecular structure of the polymeric surfactant is important in obtaining smaller emulsion droplets for a given polymer melt. Depending on the processing history, either a 'powdery dispersion' containing 10 wt% water or water continuous dispersion can be obtained. Sub-micron epoxy particles can be obtained, even at relatively low polymeric surfactant concentrations, by subjecting the [water-in-polymer melt] emulsion to very high deformation rates using a model static mixer called Multiple Expansion Contraction Static Mixer. This mixer is essentially a series of short capillaries separated by flow dividers. In order to provide constant flow rate at very high pressures, an injection moulding machine is used. (C) 2002 Kluwer Academic Publishers.

Publication metadata

Author(s): Akay G; Tong L

Publication type: Article

Publication status: Published

Journal: Journal of Materials Science

Year: 2002

Volume: 37

Issue: 23

Pages: 4985-4992

ISSN (print): 0959-9428

ISSN (electronic): 1364-5501

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1023/A:1021019111683

DOI: 10.1023/A:1021019111683

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