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