caa a22 4500 378943987 CHVBK 20180305123659.0 cr unu---uuuuu 161128e20040101xx s 000 0 eng 10.1351/pac200476112009 doi (NATIONALLICENCE)gruyter-10.1351/pac200476112009 Characterization of polyamides 6, 11, and 12. Determination of molecular weight by size exclusion chromatography (IUPAC Technical Report) [Elektronische Daten] [E. C. Robert, Rudolf Bruessau, J.-E. Dubois, Bernard Jacques, Nico Meijerink, T. Q. Nguyen, D. E. Niehaus, W. A. Tobisch] This report presents the results from IUPAC Working Party IV.2.2 of the global trial within the framework of IUPAC Commission IV.2, "Characterization of Commercial Polymers”. The results were compared on the basis of molecular weight obtained by size exclusion chromatography (SEC)using different techniques practiced in participating laboratories, the majority of which were materials suppliers. The practical methodologies used different solvents for the polymers, in particular, benzyl alcohol, 1,1,1,3,3,3 hexafluoropropan-2-ol and tetrahydrofuran; the latter solvent was used after chemical modification of the polyamides, in general with trifluoroacetic anhydride. Eight laboratories participated in the trial. The repeatability for molecular weight in each laboratory was good, whatever technique was used, the relative standard deviation averaged over all laboratories being around 3%. The deviations in distribution of molecular weights with different experimental methodologies were broader, but were reasonably good despite the diversity of methods. The differences in the distribution correspond to a confidence interval of about 30% in molecular weight. © 2013 Walter de Gruyter GmbH, Berlin/Boston Robert E. C. aut Bruessau Rudolf aut Dubois J.-E aut Jacques Bernard aut Meijerink Nico aut Nguyen T. Q. aut Niehaus D. E. aut Tobisch W. A. aut Pure and Applied Chemistry De Gruyter 76/11(2004-01-01), 2009-2025 0033-4545 76:11<2009 2004 76 pac https://doi.org/10.1351/pac200476112009 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1351/pac200476112009 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Robert E. C. aut NATIONALLICENCE 700 1- Bruessau Rudolf aut NATIONALLICENCE 700 1- Dubois J.-E aut NATIONALLICENCE 700 1- Jacques Bernard aut NATIONALLICENCE 700 1- Meijerink Nico aut NATIONALLICENCE 700 1- Nguyen T. Q. aut NATIONALLICENCE 700 1- Niehaus D. E. aut NATIONALLICENCE 700 1- Tobisch W. A. aut NATIONALLICENCE 773 0- Pure and Applied Chemistry De Gruyter 76/11(2004-01-01), 2009-2025 0033-4545 76:11<2009 2004 76 pac CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter