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Wall Slip of a Polymer Melt on a Polymer Brush

Published online by Cambridge University Press:  10 February 2011

E. Durliat ,
H. Hervet  and
L. Léger
E. Durliat
Affiliation:
Laboratoire de Physique de la Matière Condensée, URA CNRS 792 Collège de France, 11 place Berthelot, 75231 Paris cedex 05, France
H. Hervet
Affiliation:
Laboratoire de Physique de la Matière Condensée, URA CNRS 792 Collège de France, 11 place Berthelot, 75231 Paris cedex 05, France
L. Léger
Affiliation:
Laboratoire de Physique de la Matière Condensée, URA CNRS 792 Collège de France, 11 place Berthelot, 75231 Paris cedex 05, France
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Abstract

We have investigated simple shear flows of poly-dimethyl-siloxane (PDMS) melts on PDMS brushes with well controlled grafting density Σ, using optical techniques based on near field laser anemometry to measure the local velocity of a polymer melt at a solid interface. We have observed a slip transition from a weak slip regime to a strong one as the shear rate crosses a critical value γ*. The influence of the molecular weight of the melt Mm, of the molecular weight of the brush chains Mb and of Σ on γ*, has been investigated to elucidate the molecular mechanisms. The results are compared with an existing molecular model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 83
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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