The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
Determination of Plateau Moduli and Entanglement Molecular Weights of Isotactic, Syndiotactic, and Atactic Polypropylenes Synthesized with Metallocene Catalysts
Abstract
Metallocene catalysis was employed to prepare model polypropylenes (PP) with very high molecular weights and narrow molecular weight distributions (MWDs) of M w / M n ≈ 2, typical for “single site” metallocene catalysts. The viscoelastic properties of PP melts were investigated by means of oscillatory rheometry. Arrhenius and WLF equations were applied to model the influence of temperature on PP rheology. With very high molecular weight polypropylene samples it became possible to determine the onset of the plateau zone, reflecting the rubber-like properties of PP. For the first time plateau moduli and entanglement molecular weights M e s were determined and found to be depend upon stereoregularity. The entanglement molecular weights were found to be 6900 g/mol for isotactic PP, 7050 g/mol for atactic PP, and 2170 g/mol for syndiotactic PP. This influence of stereoregularity was attributed to the different conformations of syndiotactic PP with respect to isotactic and atactic PP in PP melts.
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Citations
Cites
Fetters, L. J., Lohse, D. J., Richter, D., Witten, T. A., & Zirkel, A. (1994) · Macromolecules · doi:10.1021/ma00095a001 · Cited by 1,999
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Long-Chain Branched Polypropylenes by Electron Beam Irradiation and Their Rheological Properties
Auhl, D., Stange, J., Münstedt, H., Krause, B., Voigt, D., Lederer, A., Lappan, U., & Lunkwitz, K. (2004) · Macromolecules · doi:10.1021/ma030579w · Cited by 334
Gahleitner, M. (2001) · Progress in Polymer Science · doi:10.1016/s0079-6700(01)00011-9 · Cited by 278
Thermorheologically complex self-seeded melts of propylene–ethylene copolymers
Sangroniz, L., Cavallo, D., Santamaria, A., Müller, A. J., & Alamo, R. G. (2017) · Macromolecules · doi:10.1021/acs.macromol.6b02392 · Cited by 82
Rheology of self-nucleated poly(ɛ-caprolactone) melts
Sangroniz, L., Barbieri, F., Cavallo, D., Santamaria, A., Alamo, R. G., & Müller, A. J. (2018) · European Polymer Journal · doi:10.1016/j.eurpolymj.2018.01.009 · Cited by 63
Metadata
- Authors
- Eckstein, A., Suhm, J., Friedrich, C., Maier, R.-D., Sassmannshausen, J., Bochmann, M., & Mülhaupt, R.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 1998-01-27
- Volume
- 31
- Issue
- 4
- Pages
- 1335-1340
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2024854055
- Cited by
- 292
- References
- 1
- FWCI
- 9.70
- Type
- journal article
- Language
- en
- Open access
- closed
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