(163bw) Effects of Additives on Rheological Properties, Atomization, and Coating Strength of Polyvinylpyrrolidone K90 Aqueous Solution

A simple viscometer is designed and fabricated to characterize rheological behaviors of non-Newtonian fluids, and a novel viscometer equation suitable for the viscometer is developed. Various additives such as ethanol, polyethylene oxide (PEO), sucrose and carboxymethyl cellulose (CMC) sodium salt are used to modify rheological properties, atomization, and coating strength of polyvinylpyrrolidone (PVP K90) aqueous solutions. The main objectives of this study are to examine effects of additive amounts on non-Newtonian behaviors of PVP K90 aqueous solutions, to design a simple viscometer for pseudoplastic fluids, and to develop a viscometer equation suitable for the viscometer in determining fluid consistency index and flow behavior index of PVP K90 aqueous solutions. Non-Newtonian characteristics of PVP K90 aqueous solutions are extensively investigated in terms of the additive amounts with the viscometer and its viscosity equation. Water is used as a reference/calibration liquid for the viscometer.