Quantification and characterization of the trifluoroacetic anhydride derivatives of N,N′-ethylenebisstearamide and N,N′-ethylenebisoleamide

Add time:08/20/2019    Source:sciencedirect.com

An analytical technique for the measurement of low levels (0.1–3.0%) of N,N′-ethylenebisstearamide (EBS) and N,N′-ethylenebisoleamide (EBO) in polymeric matrices has been developed. The method involves reaction of the secondary bis-amides with trifluoroacetic anhydride (TFAA) followed by high-performance liquid chromatographic (gel permeation chromatographic) separation and quantification of the N-trifluoroacyl derivatives. The method is linear in ranges typical of polymer compounding applications and offers a direct measurement of EBS and EBO without the need for prior extraction. The TFAA derivatives were isolated and characterized by infrared and direct-probe mass spectrometry.

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