Application of manganese dioxide mixed system in polysulfide sealant
Three different crystalline forms of manganese dioxide were prepared by hydrothermal synthe-sis,and the three crystalline forms of δ-MnO2,γ-MnO2 and α-MnO2 were finally determined by X-ray dif-fraction(XRD)and scanning electron microscopy(SEM).A series of manganese dioxide hybrid systems were prepared by physical mixing using a non-invasive material homogenizer.The effects of different crys-talline manganese dioxide and different manganese dioxide blending systems on the vulcanization proper-ties and mechanical properties of polysulfide sealants were investigated.The study showed that the poly-sulfide sealants vulcanized with δ-MnO2 as vulcanizing agent had better mechanical properties.The quan-titative presence of δ-MnO2 and trivalent manganese in different mixing systems contributes to the vulcani-zation of polysulfide sealants and is beneficial to improve the mechanical properties of polysulfide seal-ants.
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