People | Locations | Statistics |
---|---|---|
Ferrari, A. |
| |
Schimpf, Christian |
| |
Dunser, M. |
| |
Thomas, Eric |
| |
Gecse, Zoltan |
| |
Tsrunchev, Peter |
| |
Della Ricca, Giuseppe |
| |
Cios, Grzegorz |
| |
Hohlmann, Marcus |
| |
Dudarev, A. |
| |
Mascagna, V. |
| |
Santimaria, Marco |
| |
Poudyal, Nabin |
| |
Piozzi, Antonella |
| |
Mørtsell, Eva Anne |
| |
Jin, S. |
| |
Noel, Cédric |
| |
Fino, Paolo |
| |
Mailley, Pascal |
| |
Meyer, Ernst |
| |
Zhang, Qi |
| |
Pfattner, Raphael | Brussels |
|
Kooi, Bart J. |
| |
Babuji, Adara |
| |
Pauporte, Thierry |
|
Reinsch, Stefan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2023Influence of Mo and B additions in intermetallic near-Fe3Al alloys on microstructure and mechanical properties
- 2023Hydrogen Permeability of Tectosilicate Glasses for Tank Barrier Liners
- 2022Microstructure evolution in Inconel 718 produced by powder bed fusion additive manufacturingcitations
- 2021Foaming Species and Trapping Mechanisms in Barium Silicate Glass Sealantscitations
- 2020Hydrogen Permeation Through Glasscitations
- 2019Analytical toolset to characterize polyurethanes after exposure to artificial weathering under systematically varied moisture conditionscitations
- 2019Density, elastic constants and indentation hardness of hydrous soda-lime silica glassescitations
- 2019Surface crystallization and gas bubble formation during conventional heat treatment in Na2MnP2O7 glasscitations
- 2016Sintering and foaming of barium silicate glass powder compactscitations
- 2016Water, the other network modifier in borate glassescitations
Places of action
article
Analytical toolset to characterize polyurethanes after exposure to artificial weathering under systematically varied moisture conditions
Abstract
Polyether and -ester urethanes (PU) were exposed to artificial weathering at 40 °C and artificial UV radiation in a weathering chamber. In 3 parallel exposures, humidity was varied between dry, humid, and wet conditions. Material alteration was investigated by various analytical techniques like size exclusion chromatography (SEC), liquid chromatography-infrared spectroscopy (LC-FTIR), thermal-desorption gas chromatography-mass spectrometry (TD-GC-MS), fluorescence mapping and dynamic mechanical analysis (DMA). Our results show that depending on the weathering conditions, different degradation effects can be observed. By means of SEC an initial strong decrease of the molar masses and a broadening of the mass distributions was found. After a material dependent time span this was followed by a plateau where molar mass changes were less significant. A minor moisture-dependent degradation effect was only found for polyester PU. Fluorescence measurements on two materials revealed an increase in the luminescence intensity upon weathering process reaching a saturation level after about 500 h. The changes in the optical properties observed after different exposure conditions and times were very similar. The TD-GC-MS data showed the fate of the stabilizers and antioxidant in the course of weathering. LC-FTIR measurements revealed a change in peak intensities and the ratio of urethane and carbonyl bands.