<p>ISO 17744:2004 describes procedures for determining the specific volume of plastics as a function of temperature and pressure in both the molten and solid states.</p>
<p>The standard specifies the use of a piston-equipped apparatus in which the test sample, held in a measurement cell, is pressurized by means of the piston. Measurements under conditions of constant pressure or constant temperature can be made. In the constant-pressure mode, the maximum heating and cooling rates permissible are restricted to 5 °C/min.</p>
<p>By using these procedures, it is possible to obtain:</p>
<ul><li><i>pvT</i> diagrams that represent the relationship which exists between pressure, specific volume and temperature for a given material;</li><li>compressibility and volumetric thermal-expansion coefficients;</li><li>information on first-order and glass transitions as a function of temperature and pressure.</li></ul>
Registration number (WIID)
33196
Scope
<p>ISO 17744:2004 describes procedures for determining the specific volume of plastics as a function of temperature and pressure in both the molten and solid states.</p>
<p>The standard specifies the use of a piston-equipped apparatus in which the test sample, held in a measurement cell, is pressurized by means of the piston. Measurements under conditions of constant pressure or constant temperature can be made. In the constant-pressure mode, the maximum heating and cooling rates permissible are restricted to 5 °C/min.</p>
<p>By using these procedures, it is possible to obtain:</p>
<ul><li><i>pvT</i> diagrams that represent the relationship which exists between pressure, specific volume and temperature for a given material;</li><li>compressibility and volumetric thermal-expansion coefficients;</li><li>information on first-order and glass transitions as a function of temperature and pressure.</li></ul>
