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- Compression set (1)
- Cross-linking (1)
- Crystal melting (1)
- DMA (1)
- DSC (1)
- Dynamic mechanical analysis (1)
- EVA (1)
- Elastomer (1)
- Elastomere (1)
- Glass transition (1)
- Low temperature behaviour (1)
- Nasschemische Analyse (1)
- Ozonbeständigkeit (1)
- Ozonkonzentrationsbestimmung (1)
- Sealing material (1)
- Thermal analysis (1)
- UV-Spektroskopie (1)
Rubber is widely used as sealing material in various applications. In many fields the sealing function at low temperatures is necessary. Therefore the understanding of failure mechanisms is of high importance. Rubbers are normally used above their glass-rubber transition region but the minimum working temperature limit is not defined precisely. Therefore the lower operation temperature limit of rubber seals should be determined in dependence of the material properties. The results of Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) are combined with the results of the standardized compression set according to ISO 815 respectively a modified test using the DMA equipment.
Two types of commercially applied Ethylene/Vinyl Acetate Copolymers (EVA) for encapsulation of photovoltaic modules were investigated by the thermal analysis methods of Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) in the temperature range from -150 °C to 200 °C. Glass transition, crystal melting and cross-linking were analyzed. The aims of the investigations were to gain more information for incoming goods control and to get information about the whole temperature dependent material properties in the investigated temperature range, starting at very low temperatures up to the crosslinking temperature region.
Dargestellt wird eine Gegenüberstellung der Ergebnisse von Messungen zur Ozonkonzentrationsbestimmung nach zwei Verfahren. International wird in der Kautschukindustrie ein UV-spektroskopisches Verfahren angewandt. Die deutsche Kautschukindustrie verwendet ein nasschemisches Verfahren. Die beiden Verfahren ergeben nicht die gleichen Ergebnisse. Daher wird der Unterschied genauer ermittelt.
Die Auswirkungen der unterschiedlichen Ozonkonzentrationsbestimmungen auf die Prüfung der Ozonbeständigkeit an Elastomeren werden gezeigt.