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

Qian Huang; Olga Mednova; Henrik K. Rasmussen; Nicolas Javier Alvarez; Anne Ladegaard Skov; Kristoffer Almdal; Ole Hassager

doi:10.1021/ma4008434

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

Qian Huang, Olga Mednova, Henrik K. Rasmussen, Nicolas Javier Alvarez, Anne Ladegaard Skov, Kristoffer Almdal, Ole Hassager

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Abstract

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.

Original language	English
Journal	Macromolecules
Volume	46
Issue number	12
Pages (from-to)	5026–5035
Number of pages	10
ISSN	0024-9297
DOIs	https://doi.org/10.1021/ma4008434
Publication status	Published - 2013

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title = "Concentrated Polymer Solutions are Different from Melts: Role of Entanglement Molecular Weight",

abstract = "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.",

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AU - Huang, Qian

AU - Mednova, Olga

AU - Rasmussen, Henrik K.

AU - Javier Alvarez, Nicolas

AU - Skov, Anne Ladegaard

AU - Almdal, Kristoffer

AU - Hassager, Ole

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

U2 - 10.1021/ma4008434

DO - 10.1021/ma4008434

M3 - Journal article

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SP - 5026

EP - 5035

JO - Macromolecules

JF - Macromolecules

IS - 12

ER -

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

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