Concentrated Polymer Solutions are Different from Melts: Role of Entanglement Molecular Weight

We compare viscoelastic properties of several polystyrene solutions and melts with the same number of entanglements. It is demonstrated that the modulus and time can be shifted such that the linear viscoelastic properties are identical provided the number of entanglements are identical. However the...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecules 2013-06, Vol.46 (12), p.5026-5035
Main Authors: Huang, Qian, Mednova, Olga, Rasmussen, Henrik K, Alvarez, Nicolas J, Skov, Anne L, Almdal, Kristoffer, Hassager, Ole
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Rheology and viscoelasticity
Solution and gel properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We compare viscoelastic properties of several polystyrene solutions and melts with the same number of entanglements. It is demonstrated that the modulus and time can be shifted such that the linear viscoelastic properties are identical provided the number of entanglements are identical. However the nonlinear properties in strong extensional flow are different with polymer solutions showing markedly stronger extensional hardening than the corresponding melts. While increased chain extensibility for solutions may provide part of the explanation, it is demonstrated that other mechanisms are needed for a full explanation for the differences between solutions and melts.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma4008434