- Titel
- Film the Film
- Untertitel
- A new method to measure oxygen diffusion in polymer films using light.
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:14-qucosa2-855379
- Konferenz
- StuFoExpo. Dresden, 10. November 2022
- Quellenangabe
- #StuFoExpo 2022 - 2022
- DOI
- https://doi.org/10.25368/2023.39
- Abstract (EN)
- Organic materials such as polymer films surround us in many everyday applications ranging from food packaging and smartphone displays to medical purposes. One of their main usage scenarios is the thin, lightweight, and easy processable encapsulation to protect a particular target from molecular oxygen. Hence, the oxygen diffusion properties in these polymer films represent a key parameter. This work demonstrates a new method to determine and model the oxygen distribution in thin polymer films using light. It provides a significant advantage over many common methods since no vacuum machinery is needed. The working principle is based on the phosphorescent emission of an organic dopant which is quenched in the vicinity of molecular oxygen at room temperature. The model system used in this study consists of a polystyrene layer, which is doped with PtOEP (Platin(II)-2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin) and covered with a barrier layer of Ex-cevalTM. The oxygen concentration in the doped polystyrene film can be locally depleted under excitation with 365 nm UV light. To determine the oxygen diffusion coefficient, a concentration gradient is created and the time evolution of the luminescent pattern is recorded with a CCD-camera. The recorded data is reconverted to oxygen concentration equivalents and the impact of photoconsumption during the recording process is eliminated, before fitting it with a diffusion simulation. The result reveals a significant dependency on the processing conditions of the film, i.e. D = (1.49 ± 0.08) × 10−7 cm^2/s for unannealed and D = (0.71 ± 0.09) × 10−7 cm^2/s for an-nealed samples. The values lie well in the range reported in the literature.
- Freie Schlagwörter (DE)
- StuFoExpo 2022, Sauerstoffdiffusion, Polymerfilme, Bestimmung der Sauerstoffdiffusion
- Freie Schlagwörter (EN)
- StuFoExpo 2022, oxygen diffusion, polymer films, determine the oxygen diffusion
- Klassifikation (DDC)
- 530
- Klassifikation (RVK)
- UP 7990
- Sonstige beteiligte Institution
- Technische Universität Dresden, Dresden
- Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:14-qucosa2-855379
- Veröffentlichungsdatum Qucosa
- 30.05.2023
- Dokumenttyp
- Poster
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis
- Inhaltsverzeichnis
Problem Goal Conception The physics behind the phenomenon Results More