Abstract
In this paper, the different behavior of dilute and concentrated solutions (or melts) during an elongational flow is discussed. Some experimental results obtained with a concentrated polyacrylamide solution in water are presented together with a brief review of previous results relative to dilute solutions and melts. An interpretation of the data is attempted on the basis of well known concepts of macromolecular physics together with assumptions concerning the destruction and reformation of entanglements during the flow of the polymer.
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