Biodegradable Modified Corn Starch and Its Electroreological Properties
In this study an electrorheological (ER) effect of the suspensions containing both native starch (S) and modified starch (MS) particles in corn oil under various externally applied electric field strengths are reported. To prepare an ER active material, biodegradable starch was partially hydrolyzed and converted to its Li+ salt. Both biopolymers were characterized by 13C-NMR, Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and Thermogravimetric Analysis (TGA). Suspensions of Starch and modified Starch particles were prepared in corn oil at concentrations ranging from 5-40% by mass. Rheological measurements were carried out via a rotational rheometer with a high voltage generator to investigate the effects of electric field strength and particle concentration on ER performance. Effects of various parameters such as sedimentation stability, dispersed particle concentration, electric field strength, shear rate, frequency and temperature onto ER activity were investigated. Modified starch suspension was accepted as a biodegradable anhydrous ER fluid.
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