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Dynamic Responses in Polymer-Clay Gels

Published online by Cambridge University Press:  01 February 2011

Elena Loizou,
Lionel Porcar,
Paul Butler,
Matthew Malwitz and
Gudrun Schmidt
Elena Loizou
Affiliation:
Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803
Lionel Porcar
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Paul Butler
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
Matthew Malwitz
Affiliation:
Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803
Gudrun Schmidt
Affiliation:
Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803
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Abstract

The shear orientation of three polymer-clay gels has been investigated by means of small angle neutron scattering (SANS). The gels have the same polymer and clay concentrations but different polymer molecular weight. The polymer is adsorbed to the clay platelets. While long polymer chains can interconnect several platelets shorter polymer chains cannot. Although the polymer concentration is above c* the polymer chain length and cross linking between clay platelets strongly influence their shear orientation which leads to anisotropy in SANS. Our data suggest that the flow is strong enough to enhance and maintain a continuous increase in the shear orientation of the polymer clay gels only when the polymer chains are long enough to interconnect or strongly entangle between platelets.

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References

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