<p>This document specifies the determination of the molar-mass distribution and the average molar mass values <i>M</i><sub>n</sub> (number average) and <i>M</i><sub>w</sub> (weight average) of polymers that are soluble in tetrahydrofuran (THF) by gel permeation chromatography (GPC).</p>
<p>NOTE Also known as size exclusion chromatography (SEC).</p>
<p>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.</p>
<p>The conditions specified in this document are not applicable to the GPC analysis of polymer samples with <i>M</i><sub>w</sub> values greater than 10<sup>6</sup> g/mol and/or of polymers with elution limits outside the calibration range (see 7.6 and Annex C).</p>
<p>This document includes no correction method (e.g. for the elimination of peak broadening. If absolute molar-mass values are required, an absolute method (e.g. membrane osmometry for <i>M</i><sub>n</sub> or light scattering for <i>M</i><sub>w</sub>) can be used.</p>
Registration number (WIID)
73850
Scope
<p>This document specifies the determination of the molar-mass distribution and the average molar mass values <i>M</i><sub>n</sub> (number average) and <i>M</i><sub>w</sub> (weight average) of polymers that are soluble in tetrahydrofuran (THF) by gel permeation chromatography (GPC).</p>
<p>NOTE Also known as size exclusion chromatography (SEC).</p>
<p>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.</p>
<p>The conditions specified in this document are not applicable to the GPC analysis of polymer samples with <i>M</i><sub>w</sub> values greater than 10<sup>6</sup> g/mol and/or of polymers with elution limits outside the calibration range (see 7.6 and Annex C).</p>
<p>This document includes no correction method (e.g. for the elimination of peak broadening. If absolute molar-mass values are required, an absolute method (e.g. membrane osmometry for <i>M</i><sub>n</sub> or light scattering for <i>M</i><sub>w</sub>) can be used.</p>
