Preparation and properties of two-dimensional mica epoxy resin composite modified by ion complex
In order to achieve high performance of epoxy resin(EP),two-dimensional mica nanosheets(MNs)obtained by intercalation method were combined with toughening flame retardant methyl phosphonate-decanediamine ionic complex(MPA-DAD),and a multifunctional EP modified material MNs@MPA-DAD was prepared.The influence of MNs@MPA-DAD on the properties of EP composites was investigated by mechanical test,UL-94,limiting oxygen index(LOI),thermogravimetric,cone calorimetric and friction and wear test.The results exhibited that the ionic bond in MPA-DAD can act as a sacrificial bond and dissipate energy to improve toughness.Compared with neat EP,the tensile and flexural toughness of EP composites increased by 302%and 268%,respectively,when 8%MNs@MPA-DAD was added.Two-dimensional MNs could be used as a physical barrier to inhibit the transfer of heat and oxygen in the combustion process of materials,and played a synergistic flame retardancy mechanism with MPA-DAD.The limiting oxygen index of EP/8%MNs@MPA-DAD was increased from 20.4%(neat EP)to 28.9%,and the residues at 800℃was increased from 8.9%to 14.3%.UL-94 test passed the V-0 level,and the peak heat release rate(PHRR)and total heat release(THR)were reduced by 34.0%and 19.7%,respectively.MNs@MPA-DAD could produce a uniform lubricating transfer layer,reduced friction heat generation,avoided melting wear and improved the wear resistance of epoxy resin.The wear area of EP/8%MNs@MPA-DAD was 76.6%lower than that of neat EP.
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