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Untersuchungen zur irreversibilität von Netzwerkentschlaufungen beim Fließen von Polymerschmelzen
Author(s) -
Ehrecke Petra,
Wagner Manfred H.
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960922
Subject(s) - polymer , polymer chemistry , thermodynamics , linear low density polyethylene , materials science , polyethylene , stress relaxation , relaxation (psychology) , polymer science , chemistry , physics , composite material , creep , psychology , social psychology
Experimental and theoretical investigations of stress relaxation after “double‐step” shear experiments lead to a better understanding of the irreversibility assumption of polymer melts. Here we compare measurements of shear stress relaxation for a branched polyethylene and a (linear) polyisobutene melt to theoretical predictions of Wagner's first and second equation and to a molecular theory of Doi. None of these theories is able to describe all the results of the measurements. These investigations demonstrate, however, what types of “double‐step” shear experiments are most sensitive to the irreversible disentanglement of polymer melts.