The Irreversibility Assumption of Network Disentanglement in Flowing Polymer Melts and its Effects on Elastic Recoil Predictions
作者:
M. H. Wagner,
S. E. Stephenson,
期刊:
Journal of Rheology
(AIP Available online 1979)
卷期:
Volume 23,
issue 4
页码: 489-504
ISSN:0148-6055
年代: 1979
DOI:10.1122/1.549529
出版商: The Society of Rheology
数据来源: AIP
摘要:
Tanner has suggested a constitutive equation for polymer melts and solutions based on a network rupture hypothesis: entanglements are lost irreversibly in the process of deformation as soon as a limiting strain magnitude is reached. Although this model shows serious defects in describing time‐dependent material properties it has the appealing feature of irreversibility. On the other hand the BKZ model (considered here in the simplified version of a separable memory function), being more useful in describing startup experiments, does not posses this feature of irreversibility, leading to largely erroneous results in recovery calculations. An improved version of a single integral constitutive equation is presented, where the irreversibility of the process of network disentanglement is incorporated. Predictions of elastic recoil behavior in elongation and shear are compared with experimental results for a well‐characterized LDPE melt.
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