Stress and recovery maxima in LDPE melt elongation |
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Authors: | Thomas Raible Anton Demarmels Joachim Meissner |
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Affiliation: | (1) Department of Industrial and Engineering Chemistry, Swiss Federal Institute of Technology (ETHZ), 8092 Zürich, Switzerland |
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Abstract: | Summary By means of a new tensile rheometer for polymer melts, stress-strain curves ( ) and the elastic recovery R( ) of a low density polyethylene melt were measured up to total strains =7, i.e. stretch =1097, at 150°C and two strain rates, =0.03 and 0.1 s–1. Tensile tests up to very high strains e give relevant results only if the test performance is characterized by quality parameters which are defined and given in this paper. The test results show a maximum in a as well as in R at about =5.5. Hence, in the range of investigated, a rheologically steady-state of flow does not exist. |
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