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Characterization of Polymer-Clay Solutions by Rheology, Flow Birefringence and SANS



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


The shear orientation of viscoelastic clay-polymer solutions was investigated by means of rheology, flow birefringence and small-angle neutron scattering (SANS). Oscillatory shear showed a linear visoelastic region and flow at higher stresses. With increasing steady shear rate a pronounced minimum in birefringence was observed corresponidng to the stretching of polymer chains adsorbed between clay particles as well as the orientaiton 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 orientaiton for the clay platelets in the shear field. Cessation of shear leads to fast recovery demonstrating the system to be highly elastic.
Polymer Preprints


birefringence, clay, laponite, polymer, rheology, SANS


Han, C. , Schmidt, G. , Nakatani, A. and Karim, A. (2001), Characterization of Polymer-Clay Solutions by Rheology, Flow Birefringence and SANS, Polymer Preprints, [online], (Accessed April 15, 2024)
Created April 1, 2001, Updated February 19, 2017