Standard Test Method for Molecular Weight Averages and Molecular Weight Distribution of Polystyrene by High Performance Size-Exclusion Chromatography

Importancia y uso:

5.1 General Utility—The molecular weight (MW) and molecular weight distribution (MWD) are fundamental characteristics of a polymer sample. They are used for a wide variety of correlations for fundamental studies, processing, or product applications. For example, the observed MWD is compared to one predicted from assumed kinetics or mechanisms for a polymerization reaction. Differences between the values will allow alteration of theory or experimental design. Similarly, the strength, melt flow, and other properties of a polymer sample usually are dependent on MW and MWD. Determinations of MW and MWD are used for quality control of polymers.

5.2 Limitations—Because of the need for specific calibration of the polymer type under study, and because of the specific nature of polymer/solvent/column-packing interactions, this test method is valid only for polystyrene and non-exclusion effects are to be avoided. However, many of the principles of the method have been applied in generating HPSEC methods for other polymer systems, for example, using the principles of universal calibration. (see Practice D3016).

Subcomité:

D20.70

Referida por:

F0451-21, D6474-20, F2579-18, F2902-16E01, F1925-22, F3384-21, F2313-18, D6666-20, F2150-19, F0561-19

Volúmen:

08.03

Número ICS:

13.300 (Protection against dangerous goods)

Palabras clave:

high-performance size exclusion chromatography (HPSEC); molecular weight average; molecular weight distribution; polystyrene;