Curing Agent and Additive Matrix Effect of Graphene Nanosheets-Exfoliated Manganese Oxides Absorbing Composites

Curing agents and additives are necessary in composite materials to obtain well solidified shape and required properties. The effect of curing agents and additives for electromagnetic wave (EMW) absorbing materials is investigated in this work. The reflection loss (RL) difference is no more than 0.5 dB between unfilled matrix composites solidified by typical curing agent 4,4’-diaminodiphenylmethane (DDM) and ethylenediamine (EDA). Curing agents have low effect on composite absorbing. The reason for low effect of curing agents on absorbing is attributed to its chemical reaction level role in matrix, producing a transparent effect to EM wave. The loss difference is about 1 dB between diphenyl amidophosphate (DAP) and 1,3-dichloro-2-propanol phosphate (DPP) added matrix of composites, solidified by commercial curing agent 5772. Additives have relative higher effect than curing agents, relating to the additive types. The effect of additives is related to additive types. Composites with graphene nanosheets (GNS) and exfoliated manganese oxides (EMO) filled are taken as a typical investigated case. Curing agents and additives of non electromagnetic (EM) response will not give rise to an essential effect to EMW absorbing generally. Matrix of non EM response is independent to EMW absorbing effect for filled composites. Factually, this is a prerequisite of most absorbing investigation on filled composites in literatures. An unaware potential factor for absorbing composites of EMW is clarified.