Ultrasound Measurement of Two-Filler Concentrations in Polypropylene Compounds. Part 1: Static Calibration

Nayfeh, Taysir H.; Abu‐Zahra, Nidal; Fedek, W.M.; Salem, Asad

doi:10.1007/s001700200157

Cited by 4 publications

(1 citation statement)

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“…It can be used to model the apparent wall slip phenomena in particulate fluids [5]. In recent years, investigators have used ultrasound methods to measure density, viscosity, molecular weight and mixing properties of the polymer melts through attenuation and sound speed measurements [6][7][8][9]. These studies employ pulse-echo or pitch-catch techniques to determine the characteristics of the reflected or transmitted waves in a fluid.…”

Section: Introductionmentioning

confidence: 99%

Measurement of polymer melt rheology using ultrasonics-based in-line rheometry

Dogan¹,

McCarthy²,

Powell³

2005

Meas. Sci. Technol.

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In-line rheological measurements of a polymer melt were investigated in steady tube flow using a combination of velocity and pressure drop measurements. In tube flow, the fluid experiences shear rates that theoretically range from zero at the centre to a maximum at the wall. For complex fluids, this implies that the fluid will exhibit a wide range of viscosities that vary across the tube. Hence, from a single velocity profile in a fully developed tube flow and a simultaneous pressure drop measurement, the shear viscosity as a function of shear rate can be calculated. This point-wise rheometrical technique was pioneered in our laboratory using magnetic resonance imaging to measure the velocity profiles. In the present study, ultrasonic velocimetry is used to measure the velocity profiles. Experimental results with a polydimethylsiloxane melt showed that the shear viscosity can be measured over nearly one and one-half decades of shear rate, 1.6–17 s−1, from a single velocity profile. Over this range of shear rates, the shear viscosity decreased from 113 Pa s to 102.6 Pa s. These are the first measurements of shear viscosity of a polymer melt by this technique. The shear viscosity as measured with a cone and plate rheometer compared favourably with the viscosities determined using point-wise rheometry in the same shear rate range.

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Section: Introductionmentioning

confidence: 99%

Measurement of polymer melt rheology using ultrasonics-based in-line rheometry

Dogan¹,

McCarthy²,

Powell³

2005

Meas. Sci. Technol.

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In‐line measurement and characterization in glass bead‐filled polypropylene extrusion based on machine vision

Zhu

Wang

et al. 2022

Polymer Composites

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Particle filling is a typical method for reinforcing polymer matrix materials, and the properties of particle filler have a significant impact on the performance of polymeric materials. However, there is still a lack of effective in situ measurement and characterization methods of particulate-filled polymer. In this paper, an in-line measurement and characterization method for glass bead-filled polypropylene (GB/PP) based on machine vision was proposed. A visual die was developed, and the polymer melt in the visual area was photographed by a high-speed camera to obtain images for analysis. An improved YOLO target detection algorithm was applied to identify particles in images. The particle size distribution, dispersion, and component content of glass beads in the polypropylene were measured and characterized through statistical analysis, and then verified by other off-line methods. These properties calculated by our method agree well with those measured by other off-line methods. This method can achieve the in-line measurement and characterization for GB/PP extrusion, which is promising for the in-line property monitoring of particulate-filled polymers in the industry.

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