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Eingeladener Vortrag
- nein (67)
A first pilot study on the sorption of environmental pollutants on various microplastic materials
(2017)
With the drastic increase in plastic production, the input of plastic particles into the environment has become a recognised problem.
Xenobiotics are able to sorb to polymer materials, and this process is further enhanced where they Encounter microplastics (plastic fragments <5 mm). In this work we studied the sorption of metformin, a type-2 diabetes drug, and difenoconazole, a fungicide, onto the virgin polymer materials polyamide (PA), polypropylene (PP), and polystyrene (PS). Additionally, PP was cryo-milled and PA was treated with acid to investigate the influence of an increase in surface area and chemical modification. The material properties were also studied by dynamic scanning calorimetry (DSC), gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). Sorption experiments were performed on the basis of a full factorial design examining the effect of agitation, pH value, and salinity. Experimental results showed that difenoconazole sorbs readily to all microplastics, whereas the more polar analyte metformin did not show any affinity to the materials used. For difenoconazole the governing factor in all cases is agitation, while both pH and salinity exhibited only a slight influence. The modification of polymers leads to enhanced sorption, indicating that an increase in surface area (cryo-milled PP) or inner volume (acid-treated PA) strongly favours adsorption. Moreover, long-term experiments demonstrated that the time until equilibrium is reached depends strongly on the particle size.
Faserverbundbauteile werden durch Tränkung von Fasergewebe mit flüssigem Harz, in der Regel Epoxidharzen, und anschließender Härtung des Harzes gefertigt. Dabei kann man das Gewebe im Vorfeld mit reaktivem Harz tränken und als so genanntes Prepreg verarbeiten oder man injiziert das frisch mit dem Härter gemischte Harz in ein Werkzeug, in dem das Gewebe bereits liegt - z. B. beim RTM-Prozess. Ausgehend von der Aufgabenstellung, eine Prepregherstellung mit hohem Qualitätsstandard zu realisieren und Möglichkeiten der Fertigungskontrolle für den Prepreg-Verarbeiter aufzuzeigen, wurde an einem für die Prepregherstellung vorgesehenen Harzsystem eine weitgehende Charakterisierung des Aushärtungsverlaufs vorgenommen. Wegen der Schwierigkeit, schnell konstante Aushärtungstemperaturen zu erreichen, wurden bei allen Methoden mit einer Heizrate von 1 K/min von RT bis 200 °C aufgeheizt.
Combinations of different common flame retardants in wood–plastic composites (WPCs) are tested to identify synergistic or antagonistic effects with the goal of improving the fire performance of WPCs. Flame retardants investigated are expandable graphite (EG), ammonium polyphosphate (APP), and red phosphorus (RP) and combinations of two of them are used. The fire behavior is studied by cone calorimetric measurements. Additional thermogravimetry is used for further investigations. The fire tests show that EG has the highest potential for flame retardancy, but due to its expansion it cracks the formed residue layer. Combinations of EG with RP or with high amounts of APP are able to suppress this cracking.