Abstract
EPDM/Graphene (GN) - Zinc dimethacrylate (ZDMA) nano-composite was prepared by in situ formation of ZDMA in GN layers. Both EPDM and ZDMA molecules were confirmed to intercalate into GN layers with strong interfacial interactions and high efficiency. Compared with neat EPDM, addition of GN-ZDMA resulted in 291% increase of tensile strength and 48% increase of elongation at break, superior to that of EPDN/GN and EPDM/ZDMA. Furthermore, the increase in compression set and decrease in contact stress relaxation coefficient can be retarded during aging, resulting in enhancing durable sealing resilience. GN sheets were homogeneously embedded in matrix, which helped uniform distribution of ZDMA itself. During vulcanization process, multiple crosslinking networks was constructed, including covalent crosslinking from EPDM, ZDMA and aid of GN, and ionic crosslinking from poly-ZDMA, resulting in significant increase in crosslinking density and retention ratio during aging, and thus exhibiting synergistic reinforcing and stabilizing effect of GN-ZDMA on EPDM.
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