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Shear Orientation of a Visoelastic Polymer-Clay Solution



G Schmidt, A Nakatani, Paul Butler, Alamgir Karim, Charles C. Han


The shear orientation of viscoelastic clay-polymer solutions was investigated by means of rheology, flow birefringence (δn) and small-angle neutron scattering (SANS). Oscillatory shear showed a linear viscoelastic region and flow occured at higher stresses. With increasing steady shear rate a pronounced minimum in birefringence was observed corresponding to the stretching of polymer chains adsorbed between clay particles as well as the orientation of platelets in the flow field. SANS measured the shear-induced orientation of polymer and platelets. With increasing shear rate an anisotropic scattering pattern developed. At higher shear rates, the scattering anisotropy increases due to the increased orientation of the clay platelets in the shear field. Cessation of shear leads to fast recovery demonstrating the system to be highly elastic.
Proceedings Title
Rheology, International Congress | 13th | | British Society of Rheology (BSR)
Conference Dates
August 1, 2000
Conference Location
Cambridge, 1, UK
Conference Title
International Congress of Rheology


birefringence, clay, flow, polymer, rheology, SANS


Schmidt, G. , Nakatani, A. , Butler, P. , Karim, A. and Han, C. (2000), Shear Orientation of a Visoelastic Polymer-Clay Solution, Rheology, International Congress | 13th | | British Society of Rheology (BSR), Cambridge, 1, UK (Accessed April 17, 2024)
Created July 31, 2000, Updated October 12, 2021