Abstract
Novel epoxy resin modifiers, DOPO–TMDS and DOPO–DMDP were synthesized by addition reaction of divinylsiloxane with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Halogen-free flame retardant epoxy resins were obtained through modification of o-cresol novolac epoxy resin cured by phenol novolac resin using DOPO–TMDS and DOPO–DMDP which were characterized by 1H NMR, 13C NMR, 31P NMR and FT-IR measurements. Effects of the phosphorus-containing siloxanes on thermal stabilities, mechanical properties and flame retardant properties of the epoxy resins were investigated. The cured epoxy resins exhibited better mechanical properties and greatly improved flame retardant properties due to the presence of phosphorus-containing siloxanes. The cured epoxy resins with phosphorus loading of 2.0 wt% showed LOI values of 32–33 and achieved UL94V-0 ratings.
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The authors wish to thank for financial support of National Natural Science Foundation of China (Project Grant No. 50803069).
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Ding, J., Tao, Z., Zuo, X. et al. Preparation and properties of halogen-free flame retardant epoxy resins with phosphorus-containing siloxanes. Polym. Bull. 62, 829–841 (2009). https://doi.org/10.1007/s00289-009-0052-0
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DOI: https://doi.org/10.1007/s00289-009-0052-0