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|Author(s):||G Schmidt; A Nakatani; Paul Butler; Alamgir Karim; Charles C. Han;|
|Title:||Shear Orientation of Viscoelastic Polymer-Clay Solutions Probed by Flow Birefringence and SANS|
|Published:||October 01, 2000|
|Abstract:||Shear-induced structural changes in complex fluids of anisotropic species are a very general problem encountered not only in polymer solutions1 but also in liquid crystalline materials, 2,3 block copolymer melts, 1,4,5 and platelike clay suspensions. u6-11ifferent experimental techniques such as flow birefringence and small angle scattering have been developed to monitor such shear-induced structural changes. u12,13. Since shear can influence both the texture and the orientation of the underlying anisotropic species, it is helpful to combine different techniques in order to obtain information on different length scales. The objective of this contribution is to investigate the influence of shear on the structure of a highly viscoelastic clay-polymer solution. Previous investigations proplosed many structural models to explain the mesoscopic properties14-19 and shear behavior of aqueous clay solutions.u20-22. Despite a large body of literature on the flow behavior of polymer solutions, 1,23 little is known about the influence of shear on the viscoelastic clay-polymer solutions related to nanocomposite materials.u24^|
|PDF version:||Click here to retrieve PDF version of paper (295KB)|