The Effect of Molecular Weight Distribution on the Elongational Properties of Polymers
The transient properties of a large number of linear polymers in uniaxial elongational flows have been studied in a wide range of molecular weights and polydispersity indexes. The transient stress-strain curve at a given elongational rate may be related to the molecular weight distribution through a Wagner-like constitutive equation using as a kernel the memory function of linear viscoelasticity. The model allows to derive within experimental uncertainties the elongational properties of linear polymers from their molecular parameters at low and moderate rates of strain.
KeywordsMolecular Weight Distribution Viscoelastic Property Linear Polymer Linear Viscoelasticity Commercial Polymer
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