Abstract：After conditioning in certain hygrothermal environment,70℃,85%RH,the mechanical and dielectric properties of Nomex/cyanate ester resin sandwich composite were investigated in the dry and wet conditions.The results show that the Nomex/cyanate ester sandwich composites have very good hygrothermal resistance properties.The conservation rate of dielectric properties of Nomex/cyanate ester sandwich composites is much higher than that of other kinds of materials,indicating its best hygrothermal resistance properties in dielectric properties.Comparing with the Nomex/epoxy sandwich composites,the Nomex/cyanate sandwich composite has better mechanical properties hygrothermal resistance performance,for its facing material of cyanate ester resin,which would bring better protection for its core structure.
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