Abstract
A great deal of rheological study on polymer melts has been directed towards the flow characteristics due to shear. No doubt this is an important aspect in analyses of the polymer flow behaviour, however, product quality and the throughput rate of proceses such as blown film, melt spinning, blow moulding etc. are highly dependent on the understanding of another melt property other than shear, i.e. on elongational properties. Issues such as the blow-up-ratio of film bubbles, draw-downability, thickness of a parison etc., are dictated largely by the strength of the polymer melt under elongation. Similar to other rheological properties, elongational melt strength is a function of temperature and pressure (in terms of normal force). The present investigation was aimed at studying the effects caused by these two common processing variables (temperature and pressure) on the elongational strength of polymer melts based on a few selected polyethylenes, the findings being intended to be of practical significance for the plastics manufacturing industry.
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