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Analysis of polyamides by size exclusion chromatography and laser light scattering
Author(s) -
Chen Jinglu,
Radke Wolfgang,
Pasch Harald
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200390044
Subject(s) - molar mass , calibration curve , size exclusion chromatography , polyamide , calibration , light scattering , materials science , analytical chemistry (journal) , chromatography , scattering , electrolyte , phase (matter) , yield (engineering) , chemistry , polymer , polymer chemistry , optics , detection limit , physics , composite material , organic chemistry , quantum mechanics , electrode , enzyme
The molar mass analysis of polyamides is complicated due to the fact that only a limited range of solvents can be used and association and aggregation phenomena have to be screened by adding electrolytes to the mobile phase. Optimum SEC behaviour is obtained when hexafluoroisopropanol + 0.05 mol/L potassium trifluoroacetate is used as the mobile phase. The calibration of the SEC system can be conducted in different ways. While a calibration with narrow disperse polymethyl methacrylate standards does not yield accurate molar mass information, the quantification can be done using an “artificial” calibration curve. This calibration curve is obtained by correcting the PMMA calibration curve with polyamide molar mass data from light scattering. The resulting molar mass distributions for different types of polyamides are compared with molar masses that are determined by size exclusion chromatography with a light scattering detector and an excellent correlation is obtained.