A new method was developed for the determination of the content of secondary amino groups and thus of the corresponding trifunctional branching points in polyamides-6.6 introduced by thermal treatment. Bis(6-aminohexy1)amine is formed by total acid hydrolysis of the polyamide and determined by reversed-phase high-performance liquid chromatography using off-line pre-column derivatization with 4'-dimethylaminoazobenzene-4-sulfonyl chloride. In comparison to former analytical procedures described in literature, using paper chromatography, the new HPLC method has the advantage of higher sensitivity and better reproducibility.

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