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Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2018

On the contribution of the chain ends to the surface tension of a polymer melt

Effets d'extrémités de chaînes sur la tension de surface d'un polymère fondu.

Résumé

We propose a physical picture describing the mechanisms by which chain ends affect the surface tension of a mono-dispersed polymer melt with chain length N. The driving effect is the adsorption equilibrium of chain ends within a bulk slice adjoining the surface and acting as a confined end reservoir. The thickness of that limited space is a characteristic length of the melt. This picture conforms to a previous approach proposed years ago by de Gennes. However, the characteristic length aN1/3 that we consider is different from the one aN1/2 that he considered. Our choice is carefully argued. The resulting model correctly reflects the transition between the two N regimes reported in experimental studies, with the correct exponents. Stretching contributions are also considered, and appear small compared to the above-mentioned adsorption equilibrium effects. We think that the usefulness of the newly introduced characteristic length might exceed the specific problem addressed in the present paper. The equilibrium state of a lamellar diblock copolymer is briefly discussed for illustration.
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Dates et versions

hal-02413333 , version 1 (16-12-2019)

Identifiants

Citer

Dominique Ausserré. On the contribution of the chain ends to the surface tension of a polymer melt. European Physical Journal E: Soft matter and biological physics, 2018, 41 (6), ⟨10.1140/epje/i2018-11685-8⟩. ⟨hal-02413333⟩
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