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<p>ISO 13885-1:2008 describes the determination of the molar-mass distribution, number-average molar mass <i>M</i><sub>n</sub> and mass-average molar mass <i>M</i><sub>w</sub> of polymers that are soluble in THF (tetrahydrofuran) by gel permeation chromatography (GPC)<sup> </sup>[also known as size exclusion chromatography (SEC)].</p>
<p>It is possible that, in spite of the good repeatability obtained with this method, it cannot be used with certain polymer types because of specific interactions, such as adsorption within the sample/eluent/column system.</p>
<p>The method is not an absolute one and requires calibration with commercially available unbranched-polystyrene standards that have been characterized by absolute methods. The results for samples of polymers other than polystyrene are therefore only comparable within groups of samples of the same type.</p>
<p>The conditions specified in this part of ISO 13885 are not suitable for the GPC analysis of polymer samples with <i>M</i><sub>w</sub> values greater than 10<sup>6</sup>.</p>
<p>No correction methods, e.g. for the elimination of peak broadening, are included in this part of ISO 13885. 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>, must be used.</p>
Reģistrācijas numurs (WIID)
44648
Darbības sfēra
<p>ISO 13885-1:2008 describes the determination of the molar-mass distribution, number-average molar mass <i>M</i><sub>n</sub> and mass-average molar mass <i>M</i><sub>w</sub> of polymers that are soluble in THF (tetrahydrofuran) by gel permeation chromatography (GPC)<sup> </sup>[also known as size exclusion chromatography (SEC)].</p>
<p>It is possible that, in spite of the good repeatability obtained with this method, it cannot be used with certain polymer types because of specific interactions, such as adsorption within the sample/eluent/column system.</p>
<p>The method is not an absolute one and requires calibration with commercially available unbranched-polystyrene standards that have been characterized by absolute methods. The results for samples of polymers other than polystyrene are therefore only comparable within groups of samples of the same type.</p>
<p>The conditions specified in this part of ISO 13885 are not suitable for the GPC analysis of polymer samples with <i>M</i><sub>w</sub> values greater than 10<sup>6</sup>.</p>
<p>No correction methods, e.g. for the elimination of peak broadening, are included in this part of ISO 13885. 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>, must be used.</p>
