Thermo-mechanische Gradierung eigenverstärkter Polypropylen-Composite

Ries, Angela

kassel university press, ISBN: 978-3-86219-585-5, 2015, 207 Pages
(Schriftenreihe des Instituts für Werkstofftechnik / Kunststofftechnik 2)

URN: urn:nbn:de:0002-450453

DOI: 10.19211/kup9783737650458

Zugl.: Kassel, Univ., Diss. 2015

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Content: Vehicles are equipped with an increasing amount of glass windows to improve the comfort and spatial atmosphere for the customers. Drawbacks of this trend are the
overheating of the interior and glaring effects. An attractive solution to avoid these problems while simultaneously reducing the weight of the vehicle is to combine an electrochromic shading function and a polycarbonate window.

In this study, the ageing of a polymer-based electrochromic device and its components will be characterized, focusing on a panorama roof.

First, a global literature research on the materials and their ageing behavior will be carried out and analyzed. The ageing behavior will be the foremost focus for each material of the electrochromic device. Different relevant ageing conditions on the properties of the materials will be reviewed. Therefore a testing procedure will be developed to characterize the optical, electrical, mechanical and electrochemical properties of the materials. The ageing of each material and each property will also be statistically modelized. Thereby the relevant ageing conditions and the suitable materials will be highlighted.

After this review the ageing of the complete electrochromic device under the appropriate ageing conditions will be studied. The fabrication process will be therefore determined. Furthermore a testing procedure will be developed to define precisely and characterize the properties of the system. Finally a statistic model of the ageing will be carried out, which points out the influences of the different ageing parameters on the properties of the system.

In order to display the optimization potential of a polymer-based electrochromic device a reengineering will be carried out. The approach will be to build alternative electrochromic systems using another substrate and electrolytes and to study their ageing. The influence of a pre-treatment during fabrication will be reviewed.

The results show that the choice of the material has a strong influence on the properties of the system. An interaction between the PEDT/PSS electrochromic layer and the ITO-electrode could be demonstrated. The ion storage layer and the electrolyte have a strong influence on the ageing of the device. The performance of the device depends also on the ageing conditions. The UV-irradiation, the combination of temperature and humidity as well as solitary temperature storage, all have a particularly strong influence on the properties of the layers.

For the complete system, the fabrication process and the electrochemical properties of the device turn out to be decisive parameters concerning the ageing.

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