Detection of low levels of long-chain branching in polydisperse polyethylene materials
| Autor: | Teresa P. Karjala, Charles M. Hagen, Robert L. Sammler, Joseph W. L. Huang, Marc Mangnus, Kenneth N. Reichek, Mark S. Johnson, Lonnie G. Hazlitt, Jian Wang |
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| Rok vydání: | 2010 |
| Předmět: |
Detection limit
Materials science Polymers and Plastics Rheometer Thermodynamics General Chemistry Zero shear viscosity Polyethylene Branching (polymer chemistry) Surfaces Coatings and Films chemistry.chemical_compound chemistry Creep Polymer chemistry Materials Chemistry Molar mass distribution Long chain |
| Zdroj: | Journal of Applied Polymer Science. 119:636-646 |
| ISSN: | 0021-8995 |
| DOI: | 10.1002/app.32720 |
| Popis: | Creep experiments have been applied to probe the zero-shear viscosity, η0, of polyethylene chains directly and precisely in a constant-stress rheometer at 190°C. Such experiments, when combined with precise measurements of the weight-average molecular weight, Mw, calibrated relative to linear chains of high-density polyethylene, are shown to provide a very sensitive approach to detect low levels (0.005 branches per 1000 carbons) of long-chain branching (LCB). This detection limit is shown to be insensitive to whether the molecular weight distribution (MWD) breadth, Mw/Mn, rises from about two to ten. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 |
| Databáze: | OpenAIRE |
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