Influence of type and content of various comonomers on long-chain branching of ethene/α-olefin copolymers

Florian J. Stadler; Christian Piel; Katja Klimke; Joachim Kaschta; Matthew Parkinson; Manfred Wilhelm; Walter Kaminsky; Helmut Mûnstedt

doi:10.1021/ma0514018

Influence of type and content of various comonomers on long-chain branching of ethene/α-olefin copolymers

Florian J. Stadler
, Christian Piel
, Katja Klimke
, Joachim Kaschta
, Matthew Parkinson
, Manfred Wilhelm
, Walter Kaminsky
, Helmut Mûnstedt^*

^*Corresponding author for this work

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

123 Scopus citations

Abstract

One polyethylene and nine ethene/α-olefm copolymers differing in amount (0.4-2.9 mol %) and molar mass of the comonomer were characterized by NMR, SEC-MALLS, and rheology. Samples were polymerized using a [Ph ₂C(2,7-di-f-BuFlu)(Cp)]ZrCl₂/MAO catalyst, with octene, octadecene, and hexacosene as comonomers, resulting in polymers of M_w ≈ 190 kg/mol. The comonomer content was determined by melt-state NMR. For the homopolymer 0.37 and 0.30 LCB/molecule were found by NMR and SEC-MALLS, respectively. Rheological quantities, such as the zero shear rate viscosity (η₀), increased with LCB as compared to linear samples of the same M_w. The shape of the viscosity function and the linear steady-state elastic compliance (J_e⁰) showed a dependence on comonomer content and length. These findings are used to elucidate the various long-chain branching architectures. The highest comonomer content samples behaved like typical linear polymers in rheological experiments, while those with less comonomer contents were found to be long-chain branched. Besides the comonomer content, the type of comonomer has an influence on the branching structure.

Original language	English
Pages (from-to)	1474-1482
Number of pages	9
Journal	Macromolecules
Volume	39
Issue number	4
DOIs	https://doi.org/10.1021/ma0514018
State	Published - 21 Feb 2006
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1021/ma0514018

Cite this

@article{228411c4bac54a129a6c5221800a6505,

title = "Influence of type and content of various comonomers on long-chain branching of ethene/α-olefin copolymers",

abstract = "One polyethylene and nine ethene/α-olefm copolymers differing in amount (0.4-2.9 mol \%) and molar mass of the comonomer were characterized by NMR, SEC-MALLS, and rheology. Samples were polymerized using a [Ph 2C(2,7-di-f-BuFlu)(Cp)]ZrCl2/MAO catalyst, with octene, octadecene, and hexacosene as comonomers, resulting in polymers of Mw ≈ 190 kg/mol. The comonomer content was determined by melt-state NMR. For the homopolymer 0.37 and 0.30 LCB/molecule were found by NMR and SEC-MALLS, respectively. Rheological quantities, such as the zero shear rate viscosity (η0), increased with LCB as compared to linear samples of the same Mw. The shape of the viscosity function and the linear steady-state elastic compliance (Je0) showed a dependence on comonomer content and length. These findings are used to elucidate the various long-chain branching architectures. The highest comonomer content samples behaved like typical linear polymers in rheological experiments, while those with less comonomer contents were found to be long-chain branched. Besides the comonomer content, the type of comonomer has an influence on the branching structure.",

author = "Stadler, \{Florian J.\} and Christian Piel and Katja Klimke and Joachim Kaschta and Matthew Parkinson and Manfred Wilhelm and Walter Kaminsky and Helmut M{\^u}nstedt",

year = "2006",

month = feb,

day = "21",

doi = "10.1021/ma0514018",

language = "English",

volume = "39",

pages = "1474--1482",

journal = "Macromolecules",

issn = "0024-9297",

publisher = "American Chemical Society",

number = "4",

}

TY - JOUR

T1 - Influence of type and content of various comonomers on long-chain branching of ethene/α-olefin copolymers

AU - Stadler, Florian J.

AU - Piel, Christian

AU - Klimke, Katja

AU - Kaschta, Joachim

AU - Parkinson, Matthew

AU - Wilhelm, Manfred

AU - Kaminsky, Walter

AU - Mûnstedt, Helmut

PY - 2006/2/21

Y1 - 2006/2/21

N2 - One polyethylene and nine ethene/α-olefm copolymers differing in amount (0.4-2.9 mol %) and molar mass of the comonomer were characterized by NMR, SEC-MALLS, and rheology. Samples were polymerized using a [Ph 2C(2,7-di-f-BuFlu)(Cp)]ZrCl2/MAO catalyst, with octene, octadecene, and hexacosene as comonomers, resulting in polymers of Mw ≈ 190 kg/mol. The comonomer content was determined by melt-state NMR. For the homopolymer 0.37 and 0.30 LCB/molecule were found by NMR and SEC-MALLS, respectively. Rheological quantities, such as the zero shear rate viscosity (η0), increased with LCB as compared to linear samples of the same Mw. The shape of the viscosity function and the linear steady-state elastic compliance (Je0) showed a dependence on comonomer content and length. These findings are used to elucidate the various long-chain branching architectures. The highest comonomer content samples behaved like typical linear polymers in rheological experiments, while those with less comonomer contents were found to be long-chain branched. Besides the comonomer content, the type of comonomer has an influence on the branching structure.

AB - One polyethylene and nine ethene/α-olefm copolymers differing in amount (0.4-2.9 mol %) and molar mass of the comonomer were characterized by NMR, SEC-MALLS, and rheology. Samples were polymerized using a [Ph 2C(2,7-di-f-BuFlu)(Cp)]ZrCl2/MAO catalyst, with octene, octadecene, and hexacosene as comonomers, resulting in polymers of Mw ≈ 190 kg/mol. The comonomer content was determined by melt-state NMR. For the homopolymer 0.37 and 0.30 LCB/molecule were found by NMR and SEC-MALLS, respectively. Rheological quantities, such as the zero shear rate viscosity (η0), increased with LCB as compared to linear samples of the same Mw. The shape of the viscosity function and the linear steady-state elastic compliance (Je0) showed a dependence on comonomer content and length. These findings are used to elucidate the various long-chain branching architectures. The highest comonomer content samples behaved like typical linear polymers in rheological experiments, while those with less comonomer contents were found to be long-chain branched. Besides the comonomer content, the type of comonomer has an influence on the branching structure.

UR - https://www.scopus.com/pages/publications/33644629052

U2 - 10.1021/ma0514018

DO - 10.1021/ma0514018

M3 - Article

AN - SCOPUS:33644629052

SN - 0024-9297

VL - 39

SP - 1474

EP - 1482

JO - Macromolecules

JF - Macromolecules

IS - 4

ER -

Influence of type and content of various comonomers on long-chain branching of ethene/α-olefin copolymers

Abstract

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this