Abstract
AbstractMolecular weights of Trogamid T® were determined by ultracentrifugation, light‐scattering, osmometry and viscometry, molecular weight distributions by gel permeation chromatography (GPC) and five different fractionation methods. The separation efficiency of GPC with N,N‐dimethylformamide as solvent was tested with three different types of gels, crosslinked polystyrene, porous glass and crosslinked poly(vinyl acetate), the last one yielding the best results. Solution fractionations show better results than precipitation methods. All fractionations gave far too small apparent non‐uniformities. After correction according to the non‐uniformities of the fractions the results corresponded to those of the other methods. All methods resulted in U = M̄w/M̄n − 1 = 0,7 for the technical product Trogamid T®. The discrepancy to U = 1 of a Schulz‐Flory distribution can be explained by the influence of the path of reaction.
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