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