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Cycloaliphatic epoxy resin (EP) is a new type of materials used outdoors. Its dielectric properties directly determine whether it can be used in transmission lines. Flame retardant is an essential component of insulating materials. However, only a few papers focus on the influence of flame retardant on the dielectric properties of insulating materials. In this paper, the influence of Decabromodiphenylethane (DBDPE) flame retardant on the glass transition temperature (Tg) and dielectric properties of EP was studied by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS). The results show that DBDPE improves the Tg of EP. At high temperature above Tg, the relaxation processes caused by the movement of molecular chains and the hopping of charge carriers are inhibited by DBDPE. The DC conductivity caused by the transport of charge carriers at low frequency are also suppressed by DBDPE. The reason for that is the steric hindrance prompted by the rigid benzene ring structure of DBDPE molecules. In glassy state, DBDPE does not affect the local movement of diester structure units. Therefore, it has no effect on the dielectric loss of cycloaliphatic epoxy resin. This paper can provide theoretical guidance for engineering application of DBDPE filled EP.
Inspec keywords: vitreous state; flame retardants; differential scanning calorimetry; resins; electrical conductivity; dielectric losses; polymer structure; polymers; glass transition
Subjects: Dielectric loss and relaxation; Electrical conductivity of organic compounds and polymers; Charge carriers: generation, recombination, lifetime, and trapping (semiconductors/insulators); Flames, combustion, and explosions; Structure of polymers, elastomers, and plastics; Glass transitions