Iyer, RV and Sudhakar, A and Vijayan, Kalyani (2006) Decomposition behavior of kevlar 49 fibers: Part II. At T values lt; Td. High Performance Polymers, 18 . pp. 495-517.
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Abstract
The residual effects of thermal aging of Kevlar 49 fibers in the temperature range 150--450xB0;C have been analyzed. Thermal aging introduces crystallographic as well as macro-structural changes. Weight lossesand deterioration in tensile properties were also observed. Theorder in which the deterioration in crystallinity, weightand tensile strength occur has been identified. Mastercurves for predicting the time neededfor 50% deterioration at various temperatures and the corresponding activation energy have been estimated. The role of the parameter. tcum(T),the cumulative exposure to any temperature T, on thermally induced effects has been unambiguously established. In particular, the influence of the T- tClIm(T) effect oncrystallographic parameters has been observed for the first time.
| Item Type: | Journal Article |
|---|---|
| Additional Information: | Copyright for this article belongs to Sage Publications |
| Uncontrolled Keywords: | Kevlar 49;Structural changes;Thermal aging;Decomposition; T-tcum(T)effect |
| Subjects: | ENGINEERING > Structural Mechanics |
| Division/Department: | Materials Science Division, Materials Science Division, Materials Science Division |
| Depositing User: | M/S ICAST NAL |
| Date Deposited: | 16 Oct 2006 |
| Last Modified: | 24 May 2010 09:51 |
| URI: | http://nal-ir.nal.res.in/id/eprint/3017 |
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