Viscosity and density measurements of macromolecules

A micro-differential capillary pressure system has been established to measure the density and viscosity of macromolecular solutions as well as regular chemical solutions. Easy handling, short operational time, accuracy, low cost, high sensitivity and adaptability for on-line control of the instrument are demonstrated by the measurement on poly(ethylene glycol)/water, poly(acrylic acid)/water, sugar/water, glycerol/water, and poly(methyl methacrylate)/tetrahydrofuran systems.