Evaluation and comparison of routes to obtain pressure coefficients from high pressure capillary rheometry data

R.M. Cardinaels, P. Van Puyvelde, P. Moldenaers

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

49 Citaties (Scopus)

Uittreksel

A capillary rheometer equipped with a pressure chamber is used to measure the pressure-dependent viscosity of polymethylmethacrylate (PMMA), poly-a-methylstyrene-co-acrylonitrile (PaMSAN), 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 PaMSAN have a very similar pressure dependence, while LDPE is less sensitive to pressure.
TaalEngels
Pagina's495-505
Aantal pagina's11
TijdschriftRheologica Acta
Volume46
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 2007

Vingerafdruk

Capillarity
routes
evaluation
coefficients
shear stress
acrylonitriles
Shear deformation
Acrylonitrile
shear
Shear stress
polyethylenes
Low density polyethylenes
Polyethylene
Polymethyl Methacrylate
pressure chambers
rheometers
pressure dependence
Rheometers
viscosity
Polymers

Citeer dit

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abstract = "A capillary rheometer equipped with a pressure chamber is used to measure the pressure-dependent viscosity of polymethylmethacrylate (PMMA), poly-a-methylstyrene-co-acrylonitrile (PaMSAN), 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 PaMSAN have a very similar pressure dependence, while LDPE is less sensitive to pressure.",
author = "R.M. Cardinaels and {Van Puyvelde}, P. and P. Moldenaers",
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Evaluation and comparison of routes to obtain pressure coefficients from high pressure capillary rheometry data. / Cardinaels, R.M.; Van Puyvelde, P.; Moldenaers, P.

In: Rheologica Acta, Vol. 46, Nr. 4, 2007, blz. 495-505.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Evaluation and comparison of routes to obtain pressure coefficients from high pressure capillary rheometry data

AU - Cardinaels,R.M.

AU - Van Puyvelde,P.

AU - Moldenaers,P.

PY - 2007

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N2 - A capillary rheometer equipped with a pressure chamber is used to measure the pressure-dependent viscosity of polymethylmethacrylate (PMMA), poly-a-methylstyrene-co-acrylonitrile (PaMSAN), 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 PaMSAN have a very similar pressure dependence, while LDPE is less sensitive to pressure.

AB - A capillary rheometer equipped with a pressure chamber is used to measure the pressure-dependent viscosity of polymethylmethacrylate (PMMA), poly-a-methylstyrene-co-acrylonitrile (PaMSAN), 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 PaMSAN have a very similar pressure dependence, while LDPE is less sensitive to pressure.

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