Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 104, Issue 2, Pages 1184-1194Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/app.25757
Keywords
molecular weight distribution/molar mass distribution; polyethylene (PE); elongational; processing; rheology; long-chain branching (LCB); viscosity
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The elongational viscosities of polyethylenes with different molecular characteristics were measured at different Hencky strains and temperatures with a capillary rheometer by the replacement of the capillary cylindrical die with a hyperbolic converging die. The hyperbolic shape of the die established a purely elongational flow field at a constant elongational strain rate throughout the die. The effects of molecular characteristics such as the molecular weight, molecular weight distribution, and long-chain branching and processing conditions such as the temperature and Hencky strain on the elongational rheology of the polyethylene samples were studied. Good master curves were generated for temperature and Hencky strain shifting and simultaneous shifting with respect to both the temperature and Hencky strain. Both the molecular weight distribution and long-chain branching seemed to promote strain rate thinning and reduce the elongational viscosity. (c) 2007 Wiley Periodicals, Inc.
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