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| Titel: |
Rapid Stabilization of Acrylic Precursors for Carbon Fibres Using Ammonia |
| Auteur: |
Kiminta, D. M. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 23 (1993) nr. 1-2 pagina's 57-65 |
| Jaar: |
1993-12-01 |
| Inhoud: |
Polyacrylonitrile precursors have been successfully used for carbon fibres preparation by most industrial manufacturers for quite some time. During stabilization of these precursors, the methods applied and especially the chemical and physical changes that take place obviously dictate the eventual state of the products' properties. Because small angle x-ray scattering studies reveal the microporous nature of these fibres, the intense scattering patterns are remarkably unique for understanding the changes taking place as the fibres are stabilized. Ammonia was shown to accelerate the stabilization of some precursors. Stabilization of two acrylic fibres was studied both in air and air/ammonia atmospheres. Small Angle x-ray Scattering (SAXS) was used to study the changes of the microstructure. The study showed that the meridianol peaks which are not seen in the precursor fibres appear at the early stages of stabilization and then disappear as the stabilization progresses. The changes took place much faster in the ammonia stabilized samples, indicating the accelerating effect of ammonia. The SAXS scattering patterns also indicated the occurrence of molecular relaxation in the case of fibres stabilized in ammonia, indicating a plasticizing effect of ammonia. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 10 gevonden artikelen
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