Abstract
AbstractA method is demonstrated whereby the rheological and spray properties of dilute polymer solutions can be studied by means of a jet extrusion instrument and a capillary flow consistometer. The rheological properties that can be determined at any shear rate of extrusion are the normal (tensile) stress, the elastic shear modulus, the elastic recoverable shear strain, and viscosity. The spray properties of dilute polymer solutions can be qualitatively described in various terms such as knotted rod, knotted ligaments, long ligaments, threaded drops, grouped drops, or combinations thereof. The method has been successfully employed with dibutyl phthalate solutions of high molecular weight polyisobutyl methacrylates ranging in concentration from 0.5 to 2.0% by weight, and also with several linear polystyrenes of different molecular weights at various concentrations.
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