Effective halogen-free flame retardants for carbon fibre-reinforced epoxy composites
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The flammability and fire behaviour of fibre-reinforced epoxy composites has drawn increasing attention worldwide since the fire performance of such parts for transport applications especially is critical and is facing increasingly severe environmental legislation. Much progress has been made in improving the thermostability and flame retardancy of neat epoxy resins using a variety of compounds . In particular, halogen-free compounds such as the 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) successfully increase the flame retardancy of epoxy resins [2, 3, 4, 5, 6, 7] while avoiding many disadvantages such as poor compatibility, migration of the compound, and release of toxic gases upon burning as compared to other common compounds. Using such DOPO-based compounds, the flame retardancy of neat epoxies can be improved at phosphorus contents as low as 3 wt% [4, 7], thereby limiting processing difficulties and the often severe degradation of the resulting physical and...
KeywordsFlame Retardancy Heat Release Rate Flame Spread Strain Energy Release Total Heat Release
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