Primary amine (-NH 2) quantification in polymers: Functionality by 19F NMR spectroscopy

Shengxiang Ji, Thomas R Hoye, Chris Macosko

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

A convenient, reliable, and general method for determining the primary amine functionality of amino polymers is described. It is based on 19F NMR spectroscopy and has many advantages over known methods. The amino polymer is derivatized in situ with a reactive, trifluoromethylated aromatic aldehyde. The resultant, spontaneously formed inline (Schiff base) is then quantified by integration of its unique 19F resonance vs that of an added internal standard. The quantitative reliability of the method was first unequivocally established using a small molecule amine. Functionality determination was then demonstrated for a very broad range of polymer classes, including PS, PMMA, PEG-like, PDMS, PB, and polyamide. In contrast to, e.g., titration, this method can be carried out quickly, with small sample sizes (e.g., ca. 10 mg) and using routine NMR spectroscopic techniques.

Original languageEnglish (US)
Pages (from-to)4679-4686
Number of pages8
JournalMacromolecules
Volume38
Issue number11
DOIs
StatePublished - May 31 2005

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