| Autor: |
Klincewicz, F., Harry, D., Deitzel, J. M., Zhang, J. Q., Halls, V. |
| Předmět: |
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| Zdroj: |
International Sampe Technical Conference; 2018, p1711-1721, 11p |
| Abstrakt: |
Moisture ingress is a key contributing factor in the degradation of aramid based textiles over the course of their use-life. Furthermore, work in the literature suggests that some aramid fibers have a thermally activated transport mechanism that can greatly enhance penetration of moisture into the core of the filaments [Jackson, Shadt, Et Al; Polymer 1994], which can lead to a dramatic reduction in tensile properties [Obaid, Deitzel, Et Al; Journal of Composite Materials, 2011]. Dynamic vapor sorption experiments have been carried out at elevated temperatures for high performance Aramid, and aramid copolymer fibers, in order to evaluate the effect of temperature and humidity on the rate of diffusion and total moisture uptake in to a filament. Initial results show a marked increase in the rate of diffusion at temperatures exceeding 60°C, correlating to the reported onset of a secondary thermally activated transport mechanism in these fibers. Results from these experiments will be presented, together with a discussion of diffusion models used to calculate the diffusion coefficients. Also to be discussed are the difficulties associated with elevated temperature vapor sorption measurements and some instrumentation modifications that have been implemented to improve measurement reproducibility at elevated temperatures. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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