Online-Analysis on Acoustically Levitated Droplets |
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| Authors: | Silke Biedasek Mohammed Abboud Hans-Ulrich Moritz Achim Stammer |
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| Institution: | 1. Institute for Technical und Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, D-20146 Hamburg, Germany;2. BASF Aktiengesellschaft, Ludwigshafen, Germany |
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| Abstract: | Summary: Aqueous solutions of acrylic acid were levitated in a 40 kHz acoustic levitator. The monomer amount in the levitated droplets was monitored by Raman spectroscopy relating to an internal standard. Thus evaporation of the monomer as well as polymerization reactions initiated by a redox system were investigated by Raman spectroscopy and resultant data were compared to HPLC data. Decreases in monomer amount due to evaporation can be clearly distinguished from polymerization reactions. Additionally, temperature measurement within the droplet throughout a polymerization reaction shows the typical temperature course originating from the heat of polymerization. |
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| Keywords: | acoustic levitation acrylic acid online polymerization Raman spectroscopy |
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