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A Measuring System for Bulk and Shear Characterization of Polymers

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Abstract

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 −50 to +120°C with a precision of ±0.01°C, and pressures from atmospheric to 500 MPa with a precision of ±0.1 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 cm3/g. In all cases results are shown as measured, no additional smoothing or filtering was employed.

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Author information

Correspondence to I. Emri.

Additional information

This paper is dedicated to Professor Nicholas W. Tschoegl on the occasion of his 87th birthday, for his contributions to the field of time-dependent bulk properties of polymeric materials.

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Emri, I., Prodan, T. A Measuring System for Bulk and Shear Characterization of Polymers. Exp Mech 46, 429–439 (2006). https://doi.org/10.1007/s11340-006-8528-4

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Keywords

  • Effect of pressure and temperature
  • Time-dependent materials
  • Time-temperature-pressure superposition
  • Shear relaxation
  • Bulk creep compliance
  • Thermal expansion coefficient
  • Pressure jumps
  • Physical aging