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Dynamic Responses in Polymer-Clay Gels

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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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Acknowledgments

This work was supported in part by an NSF-CAREER award, DMR 0348884. We also acknowledge the support of NIST and the NSF, through agreement no. DMR 9986442 in providing the neutron research facilities used in this work.

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Authors and Affiliations

  1. Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA

    Elena Loizou, Matthew Malwitz & Gudrun Schmidt

  2. National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA

    Lionel Porcar & Paul Butler

Authors
  1. Elena Loizou
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  2. Lionel Porcar
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  3. Paul Butler
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  4. Matthew Malwitz
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  5. Gudrun Schmidt
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Loizou, E., Porcar, L., Butler, P. et al. Dynamic Responses in Polymer-Clay Gels. MRS Online Proceedings Library 840, Q2.7 (2004). https://doi.org/10.1557/PROC-840-Q2.7

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  • DOI: https://doi.org/10.1557/PROC-840-Q2.7

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