Title: Small-angle light scattering study of droplet break-up in emulsions and polymer blends
Authors: Mewis, Joannes
Yang, H
Van Puyvelde, Peter
Moldenaers, Paula
Walker, LM #
Issue Date: Jun-1998
Publisher: Pergamon-elsevier science ltd
Series Title: Chemical engineering science vol:53 issue:12 pages:2231-2239
Abstract: The potential of using small-angle light scattering (SALS) to probe morphological changes induced by flow in immiscible polymer blends is investigated. Well-defined flow histories are shown to result in SALS patterns that are characteristic for the morphology involved. The pertinent structural change caused by either suddenly applying flow or drastically increasing the shear rate is the stretching of inclusions into long filaments, which subsequently break up by Rayleigh instabilities. Scattering models are developed to calculate the SALS patterns resulting from a filament with a sinusoidally disturbed surface and from a series of aligned spheres. These models capture the main features of the measured SALS patterns and are used to extract quantitative morphological information of the system. This is demonstrated by comparing calculated and measured results for droplet and filament size. In this manner an in situ, time-resolved technique becomes available to follow flow-induced structural changes such as those occurring during processing of blends. (C) 1998 Elsevier Science Ltd. All rights reserved.
ISSN: 0009-2509
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Chemical Engineering - miscellaneous
Soft Matter, Rheology and Technology Section
# (joint) last author

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