Molmassebestimmung an Polyamiden und Reaktionsprodukten aus ε–Caprolactam und Phenylglycidether

Molar Mass Determination on Polyamides and on Reaction Products from ε-Caprolactam and Phenyl Glycidyl Ether Terminal groups (-NH₂, -COOH, -OH (-OH from termination reaction with epoxides)) of aliphatic oligo- and polyamides were titrated to determine the corresponding molar masses. ε-Caprolactam terminal groups were hydrolyzed to form -COOH permitting subsequent titration. The same samples were measured by using capillary viscometry, vapour pressure osmometry and size exclusion chromatography. It was shown that the molar masses obtained depend on the reaction process of the polyamide formation (anionic process with Na-caprolactam as initiator and activated anionic process with Na-caprolactam/N-acetylcaprolactam as initiator) and on the analytical method used. Molar masses from titration of terminal groups correspond to molar masses from capillary viscometry in sulfuric acid as solvent.