Polymer Molecular Weight Measurement by
High-temperature Gel Permeation Chromatography (GPC)

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Summary

It is known that the molecular weight and molecular weight distribution of resin materials affect their molding processing properties and the physical properties of the moldings obtained from them. The average molecular weight and molecular weight distribution of polymers can be determined by using GPC. High-temperature GPC is used for making measurements of those olefin-based polymers that cannot be dissolved in solvents at normal temperature.

Outline of a high-temperature GPC equipment

The GPC column inside the equipment kept at high temperature (140℃) separates the molecules according to size, which are detected by the refractometer (RI detector).

* Main objects of measurement is olefin-based polymers
Solvent: o-Dichlorobenzene (ODCB)

Example of analysis: Measurement of the molecular weight of high-density polyethylene

It is possible to calculate the molecular weight by calculating the molecular weight on the basis of the calibration curve prepared by the use of standard polystyrene (PS) and converting it to polyethylene size.

Results of measurement of various average molecular weights (as converted into PS)
Mn Mw Mw/Mn
36,000 113,000 3.12

Mn: Number-average molecular weight
Mw: Weight-average molecular weight
Mw/Mn: Polydispersion

Search Number 1026

Download The Technical Note of This Exapmle.

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