Isothermal Spinning of Molten Polyethylenes

Abstract

The behavior of a series of molten polyethylenes has been studied in the extensional flow field of a fiber spinning apparatus. Separate rheogoniometric measurements have been made of the physical properties in shearing flows and the experimental results of the fiber spinning experiment are compared with the predictions obtainable using constitutive relationships in which all of the parameters are determinable from appropriate shearing experiments. Stress levels more than one order of magnitude greater than those predicted on the assumption of isothermal Newtonian behavior were observed.