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Synthesis and characterization of an novel flame retardant based on phosphaphenanthrene for epoxy resin

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Abstract

A simple route to synthesize a new type of charring agent in high yield is reported. The polyphosphate oligomer polyphosphate poly(6-oxido-6H-dibenzo[c,e][1,2]oxa-phosphinin-6-yl phenyl phenylphosphate) (POBPP) was synthesized by addition reaction between 10-(2,5-dihydroxyl phenyl)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO-BQ) and phenyl dichlorophosphate. The structure of this product was characterized by means of the Fourier transform infrared spectra (FTIR) and nuclear magnetic resonance spectroscopy (1H–, 13C– and 31P-NMR. The molecular weight was determined by Gel Permeation Chromatography (GPC). By blending this flame retardant resin with diglycidyl ether of bisphenol-A (DGEBA) resin, a flame retardant and anti-dripping epoxy resin was obtained. Thermal stability of flame retardant (FR) and cured composites was studied by the Thermal Gravimetric Analysis (TGA). Flame retarding performances of this epoxy were characterized by limiting oxygen index (LOI) and vertical burning test (UL94). Morphology of residue was investigated by a scanning electron microscope (SEM). The results reveal that FR improve the thermal stability of epoxy resin and help matrix to leave more residue by forming net structure in char.

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Acknowledgments

This work was supported by the National Science Foundation of China Nos. 51273049 and Project of Social Development of Guizhou Province Nos. [2013]3146 and Innovation Team of Guizhou Province Nos. [2014]4006.

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Authors and Affiliations

  1. School of Chemistry and Material Science, Guizhou Normal University, Guiyang, 550001, P.R. China

    Yang Min, Pei Li, Xiao-gang Yin & Da-ming Ban

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  1. Yang Min
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  2. Pei Li
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  3. Xiao-gang Yin
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Correspondence to Da-ming Ban.

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Min, Y., Li, P., Yin, Xg. et al. Synthesis and characterization of an novel flame retardant based on phosphaphenanthrene for epoxy resin. Polym. Bull. 74, 1–10 (2017). https://doi.org/10.1007/s00289-016-1693-4

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  • DOI: https://doi.org/10.1007/s00289-016-1693-4

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