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- W2141949811 abstract "A capillary rheometer equipped with a pressure chamber is used to measure the pressure-dependent viscosity of polymethylmethacrylate (PMMA), poly-α-methylstyrene-co-acrylonitrile (PαMSAN), and low-density polyethylene (LDPE). Data analysis schemes are discussed to obtain pressure coefficients at constant shear rate and at constant shear stress. It is shown that the constant shear stress pressure coefficients have the advantage of being shear stress independent for the three polymers. The constant shear rate pressure coefficients, on the other hand, turn out to depend on shear rate, which makes them less suitable for use, e.g., in process simulations. In addition to the commonly used superposition method, a direct calculation method for the pressure coefficients is tested. Values obtained from both methods are equivalent. However, the latter requires less experimental and calculational efforts. From the obtained pressure coefficients, it is clear that PMMA and PαMSAN have a very similar pressure dependence, while LDPE is less sensitive to pressure." @default.
- W2141949811 created "2016-06-24" @default.
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- W2141949811 date "2006-12-06" @default.
- W2141949811 modified "2023-09-26" @default.
- W2141949811 title "Evaluation and comparison of routes to obtain pressure coefficients from high-pressure capillary rheometry data" @default.
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- W2141949811 doi "https://doi.org/10.1007/s00397-006-0148-5" @default.
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