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Abstract
A new polymer containing α-aminophosphonate unit (PAP) was synthesized through a simple and solvent-free Kabachnik–Fields reaction, and was characterized by NMR, FTIR, and gel permeation chromatography (GPC). This polymer was used as a novel reactive, halogen-free flame retardant. The curing behavior of bisphenol A type epoxy resin with PAP was investigated by differential scanning calorimetry (DSC), and the glass transition temperatures (Tg) of the cured sample were determined by dynamic mechanical analysis. Flammability and thermal stability of the cured epoxy resins with different contents of PAP were investigated by UL-94 test and thermogravimetric analysis (TGA). The results of UL-94 test and TGA show that PAP could improve the flame retardancy and thermal stability of cured epoxy resins. As the content of PAP was more than 20% in weight, the flame retardancy of epoxy resin can pass V-0 rating.
GRAPHICAL ABSTRACT
Acknowledgments
The authors are grateful for the support from the National Science Foundation of China (50703013, 21274049) and the Fundamental Research Fund for Central Universities (2013QN159). They also thank the Analytical and Testing Center of HUST for NMR, SEM, TGA, and DMA measurements and Mr. Ho Simon Wang at the HUST Academic Writing Center for providing tutorial assistance to improve the manuscript.