An apparatus for measuring the effect of pressure on the time-dependent properties of polymers

Prodan, Ted; Emri, Igor

doi:10.1122/1.1380260

Cited by 26 publications

(22 citation statements)

References 5 publications

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“…Material functions in frequency domain were obtained through the process of interconversion from the shear relaxation modulus, G(t, T, P) measured on a specially designed apparatus known as the CEM Measuring System-CMS [9,10].…”

Section: Methodsmentioning

confidence: 99%

“…The CMS apparatus [9][10][11] was developed to study the combined effects of temperature and hydrostatic pressure on mechanical behavior of polymers. The system can measure the volume and the shear relaxation moduli of solid polymer specimens simultaneously subjected to temperatures from À40 to +120 C and pressures from atmospheric to 5,000 bar [9,10].…”

Section: Shear Relaxation Measurementsmentioning

confidence: 99%

“…The system can measure the volume and the shear relaxation moduli of solid polymer specimens simultaneously subjected to temperatures from À40 to +120 C and pressures from atmospheric to 5,000 bar [9,10].…”

Section: Shear Relaxation Measurementsmentioning

confidence: 99%

“…Using these quantities measured at constant or varying temperature and pressure, other material functions can be calculated [9,10]. In this particular case shear relaxation modulus is of interest and is determined by measuring the decaying moment of a specimen exposed to selected constant temperature and pressure boundary conditions.…”

Section: Measuring Principlementioning

confidence: 99%

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Effect of Pressure on Damping Properties of Granular Polymeric Materials

Bek

Oseli

Saprunov

et al. 2014

Challenges in Mechanics of Time-Dependent Materials, Volume 2

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Reduction of noise and vibration coming from the rail transport activities is an important objective of the environmental policy of the European Union, due to its impact on human and animal health. It has been identified that one of the major sources of noise and vibration in rail transport is from the interaction between the wheel and the rail, the so called rolling noise. One way to mitigate this noise is to attach polymeric damping elements to the rail. By modifying bulk properties of polymeric material we can modify its damping characteristics. In this paper we demonstrated on the example of thermoplastic polyurethane (TPU) the effect of inherent hydrostatic pressure on the time-and frequency-dependent behavior of polymers. For the selected TPU material we found that increasing hydrostatic pressure from 1 to 2,000 bar shifts frequency at which material exhibits its maximal damping properties (G 00 max) from 37 to 235 Hz. It was also found that change of pressure changes values of storage modulus G 0 up to 3.5 times (depending on the frequency), while the values of loss modulus G 00 are changed up to 5.5 times. Using this property of polymeric materials we designed new generation damping elements composed of glass fiber textile tubes filled with pressurized granulated polymeric materials. Granular material with properly selected multimodal particle size distribution acts as pressurizing agent. At the same time the generated hydrostatic pressure changes frequency dependence of the granular material bulk properties. By modifying material bulk properties we can modify damping characteristics of the new generation damping elements. Applying these damping elements to the rail can substantially reduce vibration amplitudes as well as sound pressure levels, thus reducing exposure of human and animal to noise and vibration.

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Section: Methodsmentioning

confidence: 99%

Section: Shear Relaxation Measurementsmentioning

confidence: 99%

Section: Shear Relaxation Measurementsmentioning

confidence: 99%

Section: Measuring Principlementioning

confidence: 99%

See 2 more Smart Citations

Effect of Pressure on Damping Properties of Granular Polymeric Materials

Bek

Oseli

Saprunov

et al. 2014

Challenges in Mechanics of Time-Dependent Materials, Volume 2

View full text Add to dashboard Cite

show abstract

“…Therefore, in our previous work [4] we have first repeated the experiments of Fillers, Moonan and Tschoegl and compared the results to verify the performance of the apparatus. The high pressure part of the apparatus was later redesigned to allow the volumetric and the relaxation experiments at hydrostatic pressures up to 500 MPa.…”

Section: Introductionmentioning

confidence: 99%

A Measuring System for Bulk and Shear Characterization of Polymers

Emri

Prodan

2006

Exp Mech

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This paper describes a novel measuring system for investigating the influence of pressure and temperature on the mechanical properties of time-dependent polymer materials. The system can measure the volume and the shear relaxation moduli of solid polymer specimens simultaneously subjected to temperatures from j50 to +120-C with a precision of T0.01-C, and pressures from atmospheric to 500 MPa with a precision of T0.1 MPa. The paper demonstrates the measuring capabilities of the apparatus. For poly(vinyl) acetate (PVAc) are presented sample measurements of the shear relaxation modulus as function of time, pressure and temperature; specific volume; the bulk creep compliance; the coefficient of thermal expansion; the bulk modulus; and the pressure drop experiments which simulate conditions to which a material is exposed during the injection molding process. The shear moduli may be measured in the range from 1 to 4,000 MPa with the relative error of 3%.The error of volumetric measurements is 0.05%, which corresponds to 0.00005 cm 3 /g. In all cases results are shown as measured, no additional smoothing or filtering was employed.

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Structural and mechanical properties of polystyrene nanocomposites with 1D titanate nanostructures prepared by an extrusion process

et al. 2008

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Polystyrene (PS) nanocomposites with titanate nanotubes and titanate nanoribbons were prepared by an extrusion process at 180°C. Nanocomposites with 1 wt% of nanofillers and pure PS that had also been exposed to the extrusion process were comparatively examined with scanning electron microscopy (SEM), electron dispersive X‐ray spectrometry (EDS) mapping, solid state proton nuclear magnetic resonance measurements (1H NMR), tensile tests, and shear creep measurements. SEM images and EDS mapping analysis show that titanate nanoribbons homogeneously distribute at a micrometer length‐scale in the PS matrix during the extrusion process. This is not the case for titanate nanotubes, which show a stronger tendency to form clusters. Solid state 1H NMR studies, however, proved that the nanocomposites are inhomogeneous at a nanometric scale where structural components with highly mobile PS molecules coexist with domains of rigid PS molecules. Differences in the 1H spin‐lattice relaxation at and above the glass transition temperature Tg = 373 K suggest that nanofillers affect the thermodynamic properties of nanocomposite domains. Only a slight increase in mechanical tensile properties was observed in the case of the nanocomposite containing 1 wt% of titanate nanoribbons (TiNRs) probably reflecting a weak interaction between the polymer matrix and the nanofiller. Nevertheless, our results prove that the use of functionalized TiNRs may, in combination with the extrusion process, represent a very promising starting point for the preparation of TiNR nanocomposites at the industrial level. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

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An apparatus for measuring the effect of pressure on the time-dependent properties of polymers

Cited by 26 publications

References 5 publications

Effect of Pressure on Damping Properties of Granular Polymeric Materials

Effect of Pressure on Damping Properties of Granular Polymeric Materials

A Measuring System for Bulk and Shear Characterization of Polymers

Structural and mechanical properties of polystyrene nanocomposites with 1D titanate nanostructures prepared by an extrusion process

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