Flame-retarding epoxy resin has become one of the basic materials in the electronic industry. For example, brominated epoxy resins are used as main materials for the copper clad laminate, because of their good flame retardancy, low cost, excellent physical and mechanical properties. However, halogenated epoxy resins or halogen-containing flame retardants cause serious environmental problems, i.e., emitting toxic and corrosive fumes during combustion. Driven by the urgent need of environmental protection, halogen-free flame retardant (HFFR) has been being developed rapidly.
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