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| Titel: |
Styrene Diffusion in Crosslinked Unsaturated Polyester Networks |
| Auteur: |
Shah, Chirag B. Rockett, Thomas J. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 29 (1995) nr. 3-4 pagina's 227-237 |
| Jaar: |
1995-07-01 |
| Inhoud: |
Laminates of fiber reinforced polyesters are often exposed to aqueous or organic liquids or vapors in their applications as storage tanks or boat hulls. It has been observed that the long term exposure to such liquids degrade the mechanical properties of the laminate. Hence for design purpose and to ensure the successful performance of the product, it is necessary to have knowledge of the diffusion behavior of these liquids in the crosslinked network. Polyester samples of various crosslinking densities were exposed to liquid styrene and the diffusion process was characterized by weight gain measurements, and by microscopic observations of the cross section of the sample. The crosslinking density had significant effect on the diffusion mechanism and on the magnitude of the swelling stresses induced during diffusion. The diffusional swelling stresses were quantified in terms of strain birefringence, the magnitude of which was observed to depend on the degree of crosslinking of the network. The birefringence profile of the cross section indicated relaxation of the network behind the tip of the diffusion front. The prolonged exposure to styrene led to degradation by crazing and cracking. The initiation and growth pattern were also dependent on the crosslinking degree of the network. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 14 gevonden artikelen
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