Relating the shear‐thinning curve to the molecular weight distribution in linear polymer melts
作者:
Scott T. Milner,
期刊:
Journal of Rheology
(AIP Available online 1996)
卷期:
Volume 40,
issue 2
页码: 303-315
ISSN:0148-6055
年代: 1996
DOI:10.1122/1.550742
出版商: The Society of Rheology
关键词: Shear thinning;Molecular weight distribution;Double‐reptation;Cox‐Merz rule;Constraint release;MOLECULAR WEIGHT;POLYMERS;RELAXATION TIME;SHEAR PROPERTIES;STRESS RELAXATION;VISCOSITY
数据来源: AIP
摘要:
The double‐reptation ansatz for stress relaxation in broadly polydisperse melts of linear chains relates the molecular weight distribution φ(n) and the dynamic viscosity η(ω), and has been used to infer φ(n) from rheological data. I show that the microscopic theory of constraint release implies the double‐reptation model is valid for practical distributions φ(n). I also provide a heuristic theoretical argument for the Cox–Merz empirical rule that the shapes of the functions η*(ω) and η(γ̇) are similar, which allows the shear‐thinning curve to be predicted.
点击下载:
PDF
(252KB)
返 回