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- W1970696071 abstract "Background Measuring the dependence of the specific volume on pressure and temperature (PVT characterization or high-pressure dilatometry) is an important tool in understanding the thermodynamic behaviour of materials. Within the field of polymer engineering, valuable information can be obtained through PVT measurements as their behaviour is sensitive to pressure and temperature. A large variety of dilatometers have been developed to determine the PVT behaviour of materials. [ 1 ] The 'confining fluid' technique is the preferred method for polymer PVT characterization, [ 2 ] and has been used to generate virtually all recently published PVT data. In the Gnomix PVT apparatus, [ 3 ] a 1 cm 3 sample is contained in a nickel cup, used to maintain the hydrostatic pressure, and enclosed within a piezometer cell filled with a confining fluid, typically mercury. The pressure and temperature of the cell is automatically controlled and consequent variations in the volume of the sample are measured through deflection of the cell bellows. This particular apparatus can determine, with great accuracy, the specific volume of materials for temperatures between room temperature and 400°C and pressures from atmospheric to 200 MPa. However, the apparatus is limited to cooling rates of 5°C/min compared with several hundred °C/min found in the injection moulding process. Newer piston/cylinder PVT techniques can achieve cooling rates up to 300°C/min. [ 4 ] ." @default.
- W1970696071 created "2016-06-24" @default.
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- W1970696071 date "2002-01-01" @default.
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- W1970696071 title "Characterization of Polymers Through Pressure–Volume–Temperature (PVT) Analysis" @default.
- W1970696071 doi "https://doi.org/10.1071/ch02059" @default.
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