Effects of polydispersity on linear viscoelasticity in entangled polymer melts
作者:
S. H. Wasserman,
W. W. Graessley,
期刊:
Journal of Rheology
(AIP Available online 1992)
卷期:
Volume 36,
issue 4
页码: 543-572
ISSN:0148-6055
年代: 1992
DOI:10.1122/1.550363
出版商: The Society of Rheology
关键词: Molecular weight;Linear viscoelasticity;Polymer melts;Combining rule;Size‐exclusion chromatography;POLYMERS;MELTS;VISCOELASTICITY;MOLECULAR WEIGHT;DISPERSIONS;ETHYLENE;PROPYLENE;POLYSTYRENE;CHROMATOGRAPHY
数据来源: AIP
摘要:
The relationship between molecular weight distribution (MWD) and linear viscoelastic response of polymer melts was investigated with three commercial polymers and two blends (11 and 13 components, respectively) of nearly mono‐ disperse materials. Dynamic modulus master curves in the plateau and terminal zones were compared with predictions based on theoretically motivated combining rules, various descriptions of response for monodisperse melts, and the molecular weight distribution of each of the samples. Agreement with the Tsenoglou combining rule was excellent for the model mixtures, in which MWD was known by construction. Departures at low frequencies were found for the commercial samples, in which MWD was determined by size exclusion chromatography and light scattering. The discrepancy is attributed to uncertainties in the high molecular tail of distributions obtained by the dilute solution methods.
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