Influence of molecular structure on the rheology and thermorheology of metallocene polyethylenes

Ibnelwaleed A. Hussein; Tayyab Hameed; Michael C. Williams

doi:10.1002/app.24353

Influence of molecular structure on the rheology and thermorheology of metallocene polyethylenes

Ibnelwaleed A. Hussein^*
, Tayyab Hameed
, Michael C. Williams

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

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

17 Scopus citations

Abstract

The rheology of linear and branched metallocene polyethylenes (m-PEs) was investigated. The linear metallocenes were prepared by gas-phase polymerization, while the branched PEs were commercial resins. Molecular parameters such as M_w, branch type, and molecular weight distribution have influenced the viscoelastic behavior of both linear and branched PEs, whereas branch content (BC) had little influence on viscoelastic properties. Plots of log G′ versus log G″ revealed the effect of comonomer type on the viscoelastic behavior of m-PEs. Flow activation energy (E) was found to be sensitive to both M_w and BC. Also, E for ethylene-octene copolymers was observed to be always higher than the butene counterparts, which have been caused by the increase in molar volume of the repeating unit. For the effect of BC on E, different trends were observed for octene and butene m-LLDPEs.

Original language	English
Pages (from-to)	1717-1728
Number of pages	12
Journal	Journal of Applied Polymer Science
Volume	102
Issue number	2
DOIs	https://doi.org/10.1002/app.24353
State	Published - 15 Oct 2006

Keywords

Activation energy
Branch content
Comonomer type
Metallocene polyethylene
Molecular weight
Thermorheology

ASJC Scopus subject areas

General Chemistry
Surfaces, Coatings and Films
Polymers and Plastics
Materials Chemistry

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Cite this

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title = "Influence of molecular structure on the rheology and thermorheology of metallocene polyethylenes",

abstract = "The rheology of linear and branched metallocene polyethylenes (m-PEs) was investigated. The linear metallocenes were prepared by gas-phase polymerization, while the branched PEs were commercial resins. Molecular parameters such as Mw, branch type, and molecular weight distribution have influenced the viscoelastic behavior of both linear and branched PEs, whereas branch content (BC) had little influence on viscoelastic properties. Plots of log G′ versus log G″ revealed the effect of comonomer type on the viscoelastic behavior of m-PEs. Flow activation energy (E) was found to be sensitive to both Mw and BC. Also, E for ethylene-octene copolymers was observed to be always higher than the butene counterparts, which have been caused by the increase in molar volume of the repeating unit. For the effect of BC on E, different trends were observed for octene and butene m-LLDPEs.",

keywords = "Activation energy, Branch content, Comonomer type, Metallocene polyethylene, Molecular weight, Thermorheology",

author = "Hussein, \{Ibnelwaleed A.\} and Tayyab Hameed and Williams, \{Michael C.\}",

year = "2006",

month = oct,

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doi = "10.1002/app.24353",

language = "English",

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pages = "1717--1728",

journal = "Journal of Applied Polymer Science",

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TY - JOUR

T1 - Influence of molecular structure on the rheology and thermorheology of metallocene polyethylenes

AU - Hussein, Ibnelwaleed A.

AU - Hameed, Tayyab

AU - Williams, Michael C.

PY - 2006/10/15

Y1 - 2006/10/15

N2 - The rheology of linear and branched metallocene polyethylenes (m-PEs) was investigated. The linear metallocenes were prepared by gas-phase polymerization, while the branched PEs were commercial resins. Molecular parameters such as Mw, branch type, and molecular weight distribution have influenced the viscoelastic behavior of both linear and branched PEs, whereas branch content (BC) had little influence on viscoelastic properties. Plots of log G′ versus log G″ revealed the effect of comonomer type on the viscoelastic behavior of m-PEs. Flow activation energy (E) was found to be sensitive to both Mw and BC. Also, E for ethylene-octene copolymers was observed to be always higher than the butene counterparts, which have been caused by the increase in molar volume of the repeating unit. For the effect of BC on E, different trends were observed for octene and butene m-LLDPEs.

AB - The rheology of linear and branched metallocene polyethylenes (m-PEs) was investigated. The linear metallocenes were prepared by gas-phase polymerization, while the branched PEs were commercial resins. Molecular parameters such as Mw, branch type, and molecular weight distribution have influenced the viscoelastic behavior of both linear and branched PEs, whereas branch content (BC) had little influence on viscoelastic properties. Plots of log G′ versus log G″ revealed the effect of comonomer type on the viscoelastic behavior of m-PEs. Flow activation energy (E) was found to be sensitive to both Mw and BC. Also, E for ethylene-octene copolymers was observed to be always higher than the butene counterparts, which have been caused by the increase in molar volume of the repeating unit. For the effect of BC on E, different trends were observed for octene and butene m-LLDPEs.

KW - Activation energy

KW - Branch content

KW - Comonomer type

KW - Metallocene polyethylene

KW - Molecular weight

KW - Thermorheology

UR - https://www.scopus.com/pages/publications/33749503649

U2 - 10.1002/app.24353

DO - 10.1002/app.24353

M3 - Article

AN - SCOPUS:33749503649

SN - 0021-8995

VL - 102

SP - 1717

EP - 1728

JO - Journal of Applied Polymer Science

JF - Journal of Applied Polymer Science

IS - 2

ER -

Influence of molecular structure on the rheology and thermorheology of metallocene polyethylenes

Abstract

Keywords

ASJC Scopus subject areas

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