This fundamental study investigates the blowing agent (isopentane) on the extensional viscosity of LDPE at appropriate strain rates and then correlates to the foaming process. The main purpose was to calculate extensional viscosity growth function as a function of extrusion rate and time with and without the presence of isopentane in LDPE. A simple theological technique using the Haake capillary rheometer with pulling attachments was used in the study. The experimental technique is simple and cost effective, but a powerful tool to screen new resins for foam processing applications.
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