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Organisationseinheit der BAM
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- 6 Materialchemie (95)
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- 5 Werkstofftechnik (64)
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- 8.0 Abteilungsleitung und andere (31)
Eingeladener Vortrag
- nein (443)
Mechanochemistry is a fast and efficient method applicable for the synthesis of new organic, metal-organic, and inorganic compounds. The direct monitoring of milling reactions is still challenging. The underlying reaction mechanisms remain often unclear. In the last years, have established a tandem in situ approach for investigating mechanochemical reactions using time-resolved in situ XRD coupled with Raman spectroscopy. Here, we present an in situ coupling of synchrotron XRD, Raman spectroscopy, and thermography allowing the observation of mechanochemical reactions in real time. Information on the crystalline, molecular, and temperature state of the materials during grinding could be collected. The chemical composition of the reaction mixture was found to be directly correlated with changes in the temperature profile of the reaction. Furthermore, the presented setup allows the detection of crystalline, amorphous, eutectic as well as liquid intermediates. The resulting deeper kinetic and thermodynamic understanding of milling processes is the key for future optimization of mechanochemical syntheses.
Die Bewertung der Werkstoffbeständigkeit ist von großer Bedeutung bei Änderung der Zusammensetzung der Kraftstoffe und des Heizöls, insbesondere die Frage nach der Beständigkeit der Dichtungswerkstoffe bei Zusätzen von Bioethanol und Biodiesel (Rapsölfettsäuremethylester).
Vorhergehende Untersuchungen (Messungen der Veränderungen der Masse, der Zugeigenschaften und der Härte) bezogen sich auf die Bewertung der Beständigkeit häufig verwendeter Dichtungswerkstoffe wie FKM, FVMQ, VMQ, EPDM, CR, CSM, IIR, PA, NBR und PUR in Kraftstoffen und Heizöl mit 10 % Biodiesel (nicht gealtert und bis zu 5 Jahre gealtert) unter statischen Bedingungen.
Ziel der Untersuchungen war die Bewertung der Beständigkeit von Fluorkautschuk unter verpressten Bedingungen in Analogie zu den Einsatzbedingungen in der Praxis. Die Masse und der Druckverformungsrest von Prüfkörpern aus FKM wurden vor und nach der Auslagerung über einen Zeitraum von 3, 7, 14, 28, 56 und 90 Tagen in E10 (Kraftstoff mit max. 10 % Ethanol), E85 (Kraftstoff mit 85 % Ethanol), Biodiesel (Rapsölfettsäuremethylester), Super (Kraftstoff mit max. 5 % Ethanol), Dieselkraftstoff mit max. 5 % Biodiesel, Super Plus (Kraftstoff ohne Ethanolzusatz) und Heizöl mit 10 % Biodiesel (B10) bei 40 °C gemäß ISO 815-1 bestimmt. Die Druckverformungsrestprüfung zählt neben der Messung der Härte, der Dichte und der Zugeigenschaften zu den wichtigsten Grundprüfverfahren der Elastomerindustrie. Nach Ende der Auslagerung in den Kraftstoffen und der Aufhebung der Verpressung wur-de der Druckverformungsrest der Prüfkörper in regelmäßigen Zeitabständen bis zu einer Rücktrocknung > 90 Tage bestimmt. Zum Vergleich wurden Prüfkörper aus FKM ohne Kraftstoff oder Heizöl unter Verpressung bei 40 °C ausgelagert.
Die Masseänderung der Prüfkörper aus FKM betrug nach 90 Tagen Auslagerung in E10 9 %, in Super 8 %, in E85 4% und 0,6 % in Biodiesel. Die Erhöhung der Masse und die damit verbundene Quellung der Prüfkörper in E10 und Super mit 5 – 10% Ethanolzusatz hatte einen Einfluss auf den Druckverformungsrest, der sprunghaften Veränderungen unterlag im Vergleich zu den Werten nach Auslagerung in Biodiesel, Dieselkraftstoff und Heizöl B10 bei 40 °C. Zum Vergleich, unter statischen Bedingungen verringerte sich die Zugfestigkeit der Prüfkörper aus FKM nach Auslagerung in E10 bei 40 °C um 31 % und die Reißdehnung um 18 %.