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Structure of Polymer Chains Confined in Vycor

Published online by Cambridge University Press:  10 February 2011

Jyotsana Lal ,
Sunil K. Sinha  and
Loic Auvray
Jyotsana Lal
Affiliation:
Laboratoire Léon Brillouin (CEA-CNRS) 91191 Gif sur Yvette, Cedex, France.
Sunil K. Sinha
Affiliation:
APS, Argonne National Laboratory, Argonne, IL 60439, USA.
Loic Auvray
Affiliation:
Laboratoire Léon Brillouin (CEA-CNRS) 91191 Gif sur Yvette, Cedex, France.
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Abstract

We observe by Small Angle Neutron Scattering (SANS) the structure of polystyrene chains in semi-dilute solutions confined in model porous medium, Vycor. The size of the free polymer chains in solution is always larger than the pore diameter, 70 Å. The use of a suitable mixture of hydrogenated and deuterated solvents and polymers enables us to directly measure the form factor of one single chain among the others. The penetration of the chain in the porous media is almost complete for the concentration (Φ = 20%) and the range of molecular weights (35000 <M< 800000) used. The measured radius of gyration of confined chains is always smaller than the radius of gyration of free chains in the equivalent bulk solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 363
Copyright
Copyright © Materials Research Society 1997

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References

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