Thermorheological behavior of polyethylene: A sensitive probe to molecular structure

Julia A. Resch; Ute Keßner; Florian J. Stadler

doi:10.1007/s00397-011-0575-9

Thermorheological behavior of polyethylene: A sensitive probe to molecular structure

Julia A. Resch, Ute Keßner, Florian J. Stadler

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

19 Scopus citations

Abstract

Recent investigations have shown that different topographies in polyethylene (PE) lead to either thermorheological simplicity (linear and short-chain branched PE) or two different types of thermorheologically complex behavior. Low-density polyethylene (LDPE) has a thermorheological complexity, which can be eliminated by a modulus shift, while long-chain branched metallocene PE (LCB-mPE) has a temperature dependent shape of the spectrum and thus a total failure of the time-temperature superposition principle. The reason for that behavior lies in the different relaxation times of linear and long-chain branched chains, present in LCB-mPE. The origin of the thermorheological complexity of LDPE might be the temperature dependence of the miscibility of the different molar mass fractions that differ in their content of short chain branches.

Original language	English
Pages (from-to)	559-575
Number of pages	17
Journal	Rheologica Acta
Volume	50
Issue number	5-6
DOIs	https://doi.org/10.1007/s00397-011-0575-9
State	Published - Jun 2011
Externally published	Yes

Keywords

Activation energy
Molecular architecture
Polyethylene
Thermorheological complexity

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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10.1007/s00397-011-0575-9

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title = "Thermorheological behavior of polyethylene: A sensitive probe to molecular structure",

abstract = "Recent investigations have shown that different topographies in polyethylene (PE) lead to either thermorheological simplicity (linear and short-chain branched PE) or two different types of thermorheologically complex behavior. Low-density polyethylene (LDPE) has a thermorheological complexity, which can be eliminated by a modulus shift, while long-chain branched metallocene PE (LCB-mPE) has a temperature dependent shape of the spectrum and thus a total failure of the time-temperature superposition principle. The reason for that behavior lies in the different relaxation times of linear and long-chain branched chains, present in LCB-mPE. The origin of the thermorheological complexity of LDPE might be the temperature dependence of the miscibility of the different molar mass fractions that differ in their content of short chain branches.",

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AU - Resch, Julia A.

AU - Keßner, Ute

AU - Stadler, Florian J.

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AB - Recent investigations have shown that different topographies in polyethylene (PE) lead to either thermorheological simplicity (linear and short-chain branched PE) or two different types of thermorheologically complex behavior. Low-density polyethylene (LDPE) has a thermorheological complexity, which can be eliminated by a modulus shift, while long-chain branched metallocene PE (LCB-mPE) has a temperature dependent shape of the spectrum and thus a total failure of the time-temperature superposition principle. The reason for that behavior lies in the different relaxation times of linear and long-chain branched chains, present in LCB-mPE. The origin of the thermorheological complexity of LDPE might be the temperature dependence of the miscibility of the different molar mass fractions that differ in their content of short chain branches.

KW - Activation energy

KW - Molecular architecture

KW - Polyethylene

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Thermorheological behavior of polyethylene: A sensitive probe to molecular structure

Abstract

Keywords

ASJC Scopus subject areas

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