2. Polymers and the barrier effect

Barrier polymers are in a semi-crystalline state, so the crystalline phase can be considered impermeable.

Interesting barrier properties are obtained when the permeable (amorphous) structure has a high cohesive density linked to its chemical nature and a low fraction of free volume, particularly with regard to the material's history and thermal characteristics.

2.1 Barrier polymers

These materials, and their shaping, are described in other articles in Techniques de l'Ingénieur [13] and [14] . They are frequently combined in multi-layer structures.

Figure

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Polymers and the barrier effect

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page Material permeability

Multi-layer structures

References

(1) - CRANK (J.), PARK (G.S.) - Diffusion in polymers. - Academic Press, London and New-York (1968).
(2) - FIRON (M.), TROUSLARD (P.), CROS (S.) - CEA/DRT/LITEN/LCS, Dépôt de brevet français n° 06/01320.
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