Correlations between the shape of viscosity functions and the molecular structure of long-chain branched polyethylenes

Florian J. Stadler; Helmut Münstedt

doi:10.1002/mame.200800251

Correlations between the shape of viscosity functions and the molecular structure of long-chain branched polyethylenes

Florian J. Stadler, Helmut Münstedt^*

^*Corresponding author for this work

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

46 Scopus citations

Abstract

The viscosity functions of long-chain branched metallocene-catalyzed ethene homopolymers and copolymers (LCB-mPE) were described by an extended Carreau-Yasuda model.The two characteristic relaxation times, λ₁and λ₂,and the slope of the viscosity function between these two characteristic relaxation times can be correlated to the zero shear-rate viscosity, λ₀,and the molar mass M _W.The character-istic relaxation times,λ₁and λ₂(describing the main curvatures of the viscosity function) exhibit a power law dependency on the molar mass, λ_w.The parameterization of the viscosity function can be used for a molecular characterization and flow simulations of various kinds.

Original language	English
Pages (from-to)	25-34
Number of pages	10
Journal	Macromolecular Materials and Engineering
Volume	294
Issue number	1
DOIs	https://doi.org/10.1002/mame.200800251
State	Published - 14 Jan 2009
Externally published	Yes

Keywords

Influence of branching
Long-chain-branched metallocene-catalyzed polyethylene
Molar-mass dependence of parameters
Numerical description
Viscosity functions

ASJC Scopus subject areas

General Chemical Engineering
Polymers and Plastics
Organic Chemistry
Materials Chemistry

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title = "Correlations between the shape of viscosity functions and the molecular structure of long-chain branched polyethylenes",

abstract = "The viscosity functions of long-chain branched metallocene-catalyzed ethene homopolymers and copolymers (LCB-mPE) were described by an extended Carreau-Yasuda model.The two characteristic relaxation times, λ1and λ2,and the slope of the viscosity function between these two characteristic relaxation times can be correlated to the zero shear-rate viscosity, λ0,and the molar mass M W.The character-istic relaxation times,λ1and λ2(describing the main curvatures of the viscosity function) exhibit a power law dependency on the molar mass, λw.The parameterization of the viscosity function can be used for a molecular characterization and flow simulations of various kinds.",

keywords = "Influence of branching, Long-chain-branched metallocene-catalyzed polyethylene, Molar-mass dependence of parameters, Numerical description, Viscosity functions",

author = "Stadler, \{Florian J.\} and Helmut M{\"u}nstedt",

year = "2009",

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language = "English",

volume = "294",

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journal = "Macromolecular Materials and Engineering",

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T1 - Correlations between the shape of viscosity functions and the molecular structure of long-chain branched polyethylenes

AU - Stadler, Florian J.

AU - Münstedt, Helmut

PY - 2009/1/14

Y1 - 2009/1/14

N2 - The viscosity functions of long-chain branched metallocene-catalyzed ethene homopolymers and copolymers (LCB-mPE) were described by an extended Carreau-Yasuda model.The two characteristic relaxation times, λ1and λ2,and the slope of the viscosity function between these two characteristic relaxation times can be correlated to the zero shear-rate viscosity, λ0,and the molar mass M W.The character-istic relaxation times,λ1and λ2(describing the main curvatures of the viscosity function) exhibit a power law dependency on the molar mass, λw.The parameterization of the viscosity function can be used for a molecular characterization and flow simulations of various kinds.

AB - The viscosity functions of long-chain branched metallocene-catalyzed ethene homopolymers and copolymers (LCB-mPE) were described by an extended Carreau-Yasuda model.The two characteristic relaxation times, λ1and λ2,and the slope of the viscosity function between these two characteristic relaxation times can be correlated to the zero shear-rate viscosity, λ0,and the molar mass M W.The character-istic relaxation times,λ1and λ2(describing the main curvatures of the viscosity function) exhibit a power law dependency on the molar mass, λw.The parameterization of the viscosity function can be used for a molecular characterization and flow simulations of various kinds.

KW - Influence of branching

KW - Long-chain-branched metallocene-catalyzed polyethylene

KW - Molar-mass dependence of parameters

KW - Numerical description

KW - Viscosity functions

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U2 - 10.1002/mame.200800251

DO - 10.1002/mame.200800251

M3 - Article

AN - SCOPUS:58449127475

SN - 1438-7492

VL - 294

SP - 25

EP - 34

JO - Macromolecular Materials and Engineering

JF - Macromolecular Materials and Engineering

IS - 1

ER -

Correlations between the shape of viscosity functions and the molecular structure of long-chain branched polyethylenes

Abstract

Keywords

ASJC Scopus subject areas

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