BS ISO 13885-2. Gel permeation chromatography (GPC). Part 2. N,N-Dimenthylacetamide (DMAC) as eluent
87.060.20 - Binders
This document specifies the determination of the molar-mass distribution and the average molar mass values Mn (number average) and Mw (weight average) of polymers that are soluble in DMAC (N,N-Dimethylacetamide) by gel permeation chromatography (GPC)1
Also known as size exclusion chromatography (SEC).
Even though the chromatograms obtained show good repeatability, it is possible that this method cannot be used with certain polymer types because of specific interactions (e.g. adsorption) within the sample/eluent/column system.
The method is not an absolute one and requires calibration with commercially available unbranched polymethyl methacrylate standards that have been characterized by independent absolute methods. The results for samples of polymers with different chemical structures are therefore only comparable within groups of samples of the same type.
The conditions specified in this document are not suitable for the GPC analysis of polymer samples with Mw values greater than 106 g/mol and/or polymers with elution limits outside the calibration range (see 7.6 and Annex C).
No correction methods (e.g. for the elimination of peak broadening) are included in this document. If absolute molar mass values are required, an absolute method (e.g. membrane osmometry for Mn or light scattering for Mw) shall be used.
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