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Analytical methods for the quantification of free melamine and cyanuric acid in Nylon 6/6,6 co‐polymer
Author(s) -
Hamilton Deanna W.,
O'Neal Patrick A.
Publication year - 2003
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200390068
Subject(s) - cyanuric acid , melamine , detection limit , polymer , cyanuric chloride , nylon 6 , extraction (chemistry) , chemistry , melamine resin , chromatography , polymer chemistry , materials science , organic chemistry , coating
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.