ASTM D6474-12 Molecular Weight Distribution and Averages of Polyolefins

ASTM D6474-12 Molecular Weight Distribution and Averages of Polyolefins

The determination of molecular weight distributions and molecular weight averages of linear polyolefins by high-temperature gel permeation chromatography is covered by ASTM D6474-12 test technique (GPC). The final results are expressed in SI units.

    Scope:

    ASTM D6474-12 is used to determine the molecular weight distribution and molecular weight averages of polyethylene (except LDPE) and polypropylene resins. Physical qualities, such as shape, strength, melt flow, and so on, are greatly affected by differences in molecular weight and molecular weight distribution. As a result, the qualities of items made from these resins are different.

    Procedure

    A polyolefin sample is dissolved in a solvent and injected onto a chromatographic column(s) filled with a solid substrate, separating the molecules in solution according to their size. As the separated molecules elute from the column, they are detected and recorded according to concentration. Retention times are converted to molecular weights by calibration. The molecular weight concentration data helps calculates the average molecular weight parameters and molecular weight distribution.

    Test Apparatus

    A solvent reservoir, a pump, a solvent degasser, a sample injection system, packed columns, and a solute mass detector are all necessary components of the apparatus.

    Data

    Here Mw is Molecular Weight Average, Mn The number, and Mis z-average molecular weights.
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