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3. Data interpretation
At high temperatures, polymers are in a molten, amorphous state. As they cool, they generally solidify and pass through a semi-crystalline state, with a sudden increase in density, before undergoing the glass transition, a second-order transition with no change in density, to transform into amorphous glass. The following four examples illustrate the different situations that can be encountered.
3.1 Melted state
Some amorphous polymers show no solidification transition or transition to the semi-crystalline state when cooled to room temperature. This is the case with natural rubber, which decomposes at high temperatures when heated, as shown in figure
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Data interpretation
Determination of characteristic quantities
Bibliography
Standards
- Plastics – Determination of specific volume as a function of temperature and pressure (PvT diagram) – Method using a piston device. - ISO 17744:2004 - 11-04
The standard specifies the use of a piston apparatus, in which the sample under study, placed in a measuring cell, is pressurized by means of a piston. Measurements can be carried out under constant pressure or constant temperature conditions. In constant pressure...
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