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Strain : the journal of the British Society for Strain Measurement 12387 (2021). doi:10.1111/str.12387, Published by Wiley- Blackwell, Oxford [u.a.]

Verkurzte Entwicklungszeiten chemischer Prozesse sind durch Laborexperimente und Erkenntnisse daraus moglich. Dies wird durch modulare Mikrosysteme und deren Standardisierung der Apparate vereinfacht. Kunststoffe bieten durch ihre variablen Materialeigenschaften die Anpassung an die jeweiligen Prozesse sowie kostengunstige Herstellung. Das modulare Konzept besteht aus ultraschallheisgepragten PVDF-Folien. Zwei mogliche Anordnungsvarianten werden bezuglich ihrer Charakteristiken und der Verbindungsarten einzelner Module diskutiert. Die Durchfuhrung einer Neutralisationsreaktion zeigt die Flexibilitat dieses modularen Systems hinsichtlich Prozessanforderungen. A reduction of developmental periods is possible by laboratory experiments and their insights. This is simplified by modular microsystems and the related standardization of equipment. Beside a more cost-effective fabrication, plastic materials as an alternative to commercial available systems made from glass and metals offer variable properties making an adaption on process demands possible. The modular system consists of ultrasonic hot embossed PVDF foils. Two arrangement concepts are discussed regarding their characteristics and connection techniques of single modules. Running a neutralization reaction shows the flexibility of this modular concept concerning process demands.

Ultrasonic hot embossing of polymers is an alternative to reduce fabrication costs of microreactors. An ultrasonic welding machine is used to melt a stack of thermoplastic foils and adapting them to a short-time milled aluminum mold showing the inversed design of the desired microfluidic cavities. Two micromixers were fabricated this way providing a low degree of axial dispersion and pressure loss. Stability analysis is successfully performed for a wide temperature range and high pressure. Mixing of colored aqueous solutions and neutralization reactions are implemented to both systems for defined volume flow rates and optically investigated via microscope. Reaction progress is automatically determined with a MATLAB script by reference to the consequential color change of the neutralization reaction with a color indicator. Typical mixing characteristics are identified for both mixers.