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Analytical methods for the quantification of free melamine and cyanuric acid in Nylon 6/6,6 co-polymer

✍ Scribed by Deanna W. Hamilton; Patrick A. O'Neal

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 174 KB
Volume: 26
Category: Article
ISSN: 1615-9306
DOI: 10.1002/jssc.200390068

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✦ Synopsis

Abstract

Melamine cyanurate is a salt of melamine and cyanuric acid, which is commonly used as a flame retardant in nylon polymer. Free cyanuric acid and/or melamine in nylon polymer can cause processing problems in molded applications, resulting in brittle parts with low ductility. Analytical methods have been developed to extract free cyanuric acid and melamine from nylon 6/6,6 co‐polymer using an octanesulfonic acid/isopropanol solution. An ion exclusion chromatography method with ultraviolet spectroscopic detection has been developed to quantify free cyanuric acid in the nylon extractant. Extraction efficiency of 88–133% and limit of detection of 0.4 ppm was obtained for free cyanuric acid in nylon polymer using this method. A liquid chromatography method with ultraviolet spectroscopic detection has been developed to quantify free melamine in the nylon extractant. Extraction efficiency of 76–90% and limit of detection of 2.8 ppm was realized for free melamine in nylon polymer using this method. These new analytical techniques have been successfully utilized to quantify free melamine and cyanuric acid in nylon 6/6,6 co‐polymer.

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