Synthesis and characterization of novel ethylene- graft -ethylene/propylene copolymers

Florian J. Stadler; Burçak Arikan-Conley; Joachim Kaschta; Walter Kaminsky; Helmut Münstedt

doi:10.1021/ma200588r

Synthesis and characterization of novel ethylene- graft -ethylene/propylene copolymers

Florian J. Stadler, Burçak Arikan-Conley, Joachim Kaschta, Walter Kaminsky, Helmut Münstedt

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

38 Scopus citations

Abstract

A sequential metallocene-catalyzed synthesis of ethylene/propylene macromers, which are subsequently incorporated into growing polyethylene chains, leads to comb-like polymers. After the synthesis, a Soxhlet extraction ensures the purity of the sample. The GPC-MALLS analysis reveals narrowly distributed samples with a non-negligible degree of branching. The comb polymers show a very high viscosity, which significantly differs from conventional long-chain branched metallocene polyethylenes (LCB-mPE) but is in agreement with findings on comb model polymers. The zero shear rate viscosity η₀ lies significantly above the relation between M_w and η₀ for linear and for conventional LCB-mPE. The thermorheological behavior is complex and differs from that observed for LCB-mPE but also does not resemble an LDPE-like thermorheological behavior.

Original language	English
Pages (from-to)	5053-5063
Number of pages	11
Journal	Macromolecules
Volume	44
Issue number	12
DOIs	https://doi.org/10.1021/ma200588r
State	Published - 28 Jun 2011
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Synthesis and characterization of novel ethylene- graft -ethylene/propylene copolymers",

abstract = "A sequential metallocene-catalyzed synthesis of ethylene/propylene macromers, which are subsequently incorporated into growing polyethylene chains, leads to comb-like polymers. After the synthesis, a Soxhlet extraction ensures the purity of the sample. The GPC-MALLS analysis reveals narrowly distributed samples with a non-negligible degree of branching. The comb polymers show a very high viscosity, which significantly differs from conventional long-chain branched metallocene polyethylenes (LCB-mPE) but is in agreement with findings on comb model polymers. The zero shear rate viscosity η0 lies significantly above the relation between Mw and η0 for linear and for conventional LCB-mPE. The thermorheological behavior is complex and differs from that observed for LCB-mPE but also does not resemble an LDPE-like thermorheological behavior.",

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AU - Stadler, Florian J.

AU - Arikan-Conley, Burçak

AU - Kaschta, Joachim

AU - Kaminsky, Walter

AU - Münstedt, Helmut

PY - 2011/6/28

Y1 - 2011/6/28

N2 - A sequential metallocene-catalyzed synthesis of ethylene/propylene macromers, which are subsequently incorporated into growing polyethylene chains, leads to comb-like polymers. After the synthesis, a Soxhlet extraction ensures the purity of the sample. The GPC-MALLS analysis reveals narrowly distributed samples with a non-negligible degree of branching. The comb polymers show a very high viscosity, which significantly differs from conventional long-chain branched metallocene polyethylenes (LCB-mPE) but is in agreement with findings on comb model polymers. The zero shear rate viscosity η0 lies significantly above the relation between Mw and η0 for linear and for conventional LCB-mPE. The thermorheological behavior is complex and differs from that observed for LCB-mPE but also does not resemble an LDPE-like thermorheological behavior.

AB - A sequential metallocene-catalyzed synthesis of ethylene/propylene macromers, which are subsequently incorporated into growing polyethylene chains, leads to comb-like polymers. After the synthesis, a Soxhlet extraction ensures the purity of the sample. The GPC-MALLS analysis reveals narrowly distributed samples with a non-negligible degree of branching. The comb polymers show a very high viscosity, which significantly differs from conventional long-chain branched metallocene polyethylenes (LCB-mPE) but is in agreement with findings on comb model polymers. The zero shear rate viscosity η0 lies significantly above the relation between Mw and η0 for linear and for conventional LCB-mPE. The thermorheological behavior is complex and differs from that observed for LCB-mPE but also does not resemble an LDPE-like thermorheological behavior.

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Synthesis and characterization of novel ethylene- graft -ethylene/propylene copolymers

Abstract

ASJC Scopus subject areas

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