Correlations between the Characteristic Rheological Quantities and Molecular Structure of Long-Chain Branched Metallocene Catalyzed Polyethylenes
Abstract
Different rheological quantities, such as the zero shear-rate viscosity η 0 and the linear steady-state elastic compliance J e 0 of long-chain branched metallocene-catalyzed ethene homopolymers and ethene-/α-olefin copolymers with a polydispersity M w /M n ≈ 2, were correlated with the molar mass M w and degree of long-chain branching λ. A linear reference for the δ(| G * |) plot was used to show the effect of long-chain branches on this rheological property. The linear steady-state elastic compliance J e 0 correlated with the zero shear-rate viscosity increase factor η 0 /η 0 lin and the characteristic phase angle δ c . However, the latter only works when compensating for the influence of the molar mass on J e 0 by the relationship between J e 0 and M w established elsewhere (Stadler and Münstedt, JoR, 2008). The characteristic phase angle δ c and zero shear-rate viscosity enhancement factor η 0 /η 0 lin are linked to each other by the linear dependencies for the type I and type II viscosity functions.
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Stadler et al. report that correlations between long-chain branched polyethylenes and linear polyethylenes can be made by the addition of a scaling factor, where the zero shear viscosity of the branched polyolefin is normalized by that of a linear polyethylene of the same Mw.
“Stadler et al ( 30 ) report that correlations between long-chain branched polyethylenes and linear polyethylenes can be made by the addition of a scaling factor, where the zero shear viscosity of the branched polyolefin is normalized by that of a linear polyethylene of the same M w.”
From Chemically recyclable polyolefin-like multiblock polymers (2023) · cites this paper as [30]
The zero-shear viscosity of the copolymers shows non-linear relationships with average degree of branching, consistent with literature observations.
“However, our observations of non-linear relationships between zero-shear viscosity and average degree of branching are consistent with observations from the literature.”
From Chemically recyclable polyolefin-like multiblock polymers (2023) · cites this paper as [30]
The authors discuss that architectures such as LDPE and comb-like PE do not adhere to the linear polyethylene η0-Mw relation even with this scaling factor applied.
“Additionally, the authors discuss that architectures such as LDPE and comb-like PE do not adhere to the linear polyethylene η 0 -M w relation even with this scaling factor applied.”
From Chemically recyclable polyolefin-like multiblock polymers (2023) · cites this paper as [30]
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Chemically recyclable polyolefin-like multiblock polymers
Zhao, Y., Rettner, E. M., Harry, K. L., Hu, Z., Miscall, J., Rorrer, N. A., & Miyake, G. M. (2023) · Science · doi:10.1126/science.adh3353 · Cited by 205 · see citing works
- Authors
- Stadler, F. J., & Karimkhani, V.
- Affiliations
- Friedrich-Alexander-Universität Erlangen-Nürnberg (DE)
- Amirkabir University of Technology (IR)
- Corresponding author
- Stadler, Florian J.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-06-09
- Volume
- 44
- Issue
- 13
- Pages
- 5401-5413
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2319862058
- Cited by
- 41
- References
- 86
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 4 · 2022: 2 · 2021: 4 · 2020: 4 · 2018: 1 · 2017: 3 · 2016: 6 · 2015: 5 · 2014: 1 · 2013: 5 · 2012: 2
- FWCI
- 2.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Macromolecules (publishedVersion)
- Topics
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Rheology and Fluid Dynamics Studies
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Chemistry › Organic Chemistry › Organometallic Complex Synthesis and Catalysis
- Keywords
- long-chain branching, metallocene-catalyzed polyethylene, rheological properties, zero-shear viscosity, degree of branching, molecular weight dependence, structure-property relationships
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