Distinguishing linear from star-branched polystyrene solutions with Fourier-transform rheology

Thorsten Neidhöfer; Stella Sioula; Nikos Hadjichristidis; Manfred Wilhelm

doi:10.1002/marc.200400295

Distinguishing linear from star-branched polystyrene solutions with Fourier-transform rheology

Thorsten Neidhöfer, Stella Sioula, Nikos Hadjichristidis, Manfred Wilhelm^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

Fourier-Transform rheology (FT rheology) was used to study the influence of the degree of branching on the nonlinear relaxation behaviour of polystyrene solutions. The results were compared with those obtained under oscillatory shear and step-shear conditions. The different topologies could be distinguished using FT rheology where the other rheological measurements failed. Significant differences occurred under large amplitude oscillatory shear (LAOS) conditions as particularly reflected in the phase difference of the third harmonic, Φ ₃, which could be related to strain-softening and strains-hardening behaviour. Currently, this work is extended towards different topologies in polyolefins (e.g. long chain branched).

Original language	English (US)
Pages (from-to)	1921-1926
Number of pages	6
Journal	Macromolecular Rapid Communications
Volume	25
Issue number	22
DOIs	https://doi.org/10.1002/marc.200400295
State	Published - Nov 12 2004
Externally published	Yes

Keywords

FT rheology
Large amplitude oscillatory shear (LAOS)
Polystyrene
Viscoelastic properties

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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title = "Distinguishing linear from star-branched polystyrene solutions with Fourier-transform rheology",

abstract = "Fourier-Transform rheology (FT rheology) was used to study the influence of the degree of branching on the nonlinear relaxation behaviour of polystyrene solutions. The results were compared with those obtained under oscillatory shear and step-shear conditions. The different topologies could be distinguished using FT rheology where the other rheological measurements failed. Significant differences occurred under large amplitude oscillatory shear (LAOS) conditions as particularly reflected in the phase difference of the third harmonic, Φ 3, which could be related to strain-softening and strains-hardening behaviour. Currently, this work is extended towards different topologies in polyolefins (e.g. long chain branched).",

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AU - Neidhöfer, Thorsten

AU - Sioula, Stella

AU - Hadjichristidis, Nikos

AU - Wilhelm, Manfred

PY - 2004/11/12

Y1 - 2004/11/12

N2 - Fourier-Transform rheology (FT rheology) was used to study the influence of the degree of branching on the nonlinear relaxation behaviour of polystyrene solutions. The results were compared with those obtained under oscillatory shear and step-shear conditions. The different topologies could be distinguished using FT rheology where the other rheological measurements failed. Significant differences occurred under large amplitude oscillatory shear (LAOS) conditions as particularly reflected in the phase difference of the third harmonic, Φ 3, which could be related to strain-softening and strains-hardening behaviour. Currently, this work is extended towards different topologies in polyolefins (e.g. long chain branched).

AB - Fourier-Transform rheology (FT rheology) was used to study the influence of the degree of branching on the nonlinear relaxation behaviour of polystyrene solutions. The results were compared with those obtained under oscillatory shear and step-shear conditions. The different topologies could be distinguished using FT rheology where the other rheological measurements failed. Significant differences occurred under large amplitude oscillatory shear (LAOS) conditions as particularly reflected in the phase difference of the third harmonic, Φ 3, which could be related to strain-softening and strains-hardening behaviour. Currently, this work is extended towards different topologies in polyolefins (e.g. long chain branched).

KW - FT rheology

KW - Large amplitude oscillatory shear (LAOS)

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KW - Viscoelastic properties

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Distinguishing linear from star-branched polystyrene solutions with Fourier-transform rheology

Abstract

Keywords

ASJC Scopus subject areas

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