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| Titel: |
Diffusion in Polymers with Varying Accessibility |
| Auteur: |
Markin, V. S. Zaikov, G. E. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 25 (1994) nr. 1-2 pagina's 29-35 |
| Jaar: |
1994-04-01 |
| Inhoud: |
This paper considers the problem of describing quantitatively the process of diffusion in polymers attended with plasticization of their amorphous phase. A consequence of such plasticization is that the volume accessible for the penetrant molecules continuously increases during the course of their sorption. Assuming that the rate of the relaxation processes is far greater than that of diffusion, an equation has been generated to describe sorption in a matrix with varying accessibility. The numerical solution of this equation using the experimental data for a polyamide-water system demonstrates that sorption in the matrix with increasing accessibility is slower than sorption in a hypothetical matrix with constant accessibility equal to the portion of the amorphous phase. At the same time, the concentration of the penetrant in the former case proves higher in any point of the polymer specimen. The results obtained are important for calculating the rate constants for chemical reactions that in a polymer matrix are proceeding in the diffusion-kinetic mode. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 17 gevonden artikelen
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