4. Control and designation
4.1 Characterization and control methods
Measurement of structural parameters and rheological properties
The structural parameters of PP can be measured by various methods:
the molar masses in number and mass and their I p ratio are measured by gel permeation chromatography;
the isotacticity rate is equal to the mass fraction of PP insoluble in boiling n-heptane;
the degree of crystallinity is assessed by differential scanning calorimetry (DSC), density measurement or X-ray measurement.
Melt rheological properties are characterized...
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Control and designation
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Statistical and economic data
1.Production trends
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France
In thirty years, French polypropylene production has risen from zero to 1.4 Mt/year (figure ).
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