We show that some of the experimental results on the stretching and fracture of isolated polymers in elongational flows do not agree with existing theoretical predictions. We suggest that the difficulties stem from the assumption of an abrupt transition from a uniformly deformed coil to a fully stretched state of the polymer and that the experimental observations support a recently proposed model according to which the stretching proceeds continuously through a non-uniform state of the deformed macromolecule that consists of a strongly stretched central segment and weakly perturbed coiled ends. Further experimental tests of the above model are proposed.
|Number of pages||5|
|Journal||Journal of Non-Newtonian Fluid Mechanics|
|State||Published - 1988|
Bibliographical noteFunding Information:
Helpful conversationsa nd written correspondencew ith E.W. Merrill, T.Q. Nguyen and G. Ryskin are gratefully acknowledgedT. his work was supportedb y grants from the Bat-Shevad e Rothschild Foundation and from DARPA (throught he La Jolla Institute).