Interaction Between Graphene Oxide And Rubber And Its Influence On Composites Performance

Graphene oxide(GO)has attracted great interest to prepare high-performance rubber composites due to its unique structure and properties.But the interaction between GO and nonpolar rubber is poor,which hinders reinforcing effect of GO for rubber.In this dissertation,high-performance GO/styrene-butadiene rubber(SBR)composites was modified by carboxylated acrylonitrile-butadiene rubber(xNBR)through the interaction between GO and xNBR.The result showed that the interaction between GO and xNBR was hydrogen bonding.The dispersion of xNBR modified GO in matrix was uniform,the crosslink density of composites increased with the rising of GO content.Compared with unfilled rubber,the tensile strength of composite increased by 359%with 3 phr GO.When GO loading reached 5 phr,Mioo,M300 and tear strength 149%,356%and 310%,respectively.Meanwhile,the maximum heat decomposition temperature(Tmax)and thermal conductivity coefficient rose 17.49 ? and 33%respectively,and solvent uptake in toluene(Qe)reduced by 41%.The oxidation degree of GO exerts a remarkable impact on its surface properties and GO-rubber interaction,then further influencing reinforcing effect of GO on rubber.The study on the preparation of GO with diverse oxidation levels revealed that the increased KMn04 agent lead to the larger interlayer spacing and higher exfoliation degree of GO,while there was a decline in C/O value,thermal stability and ?potential.The research on the reinforcing effect of GO with different oxidation degree towards rubber demonstrates that the stronger GO-rubber interaction and more homogeneous dispersion of GO in matrix can be attained upon increasing GO oxidation extents.In contrast with pristine rubber,Qe reduced by 41%with adding GOD 3.Upon adding GOD 15,thermal conductivity,tensile strength,tear strength,Mioo and M300 increased by 33%,115%,88%,111%and 269%respectively.Tmax increases by 8.41 °C at heating rate of 20 °C/min.In xNBR/SBR blends,contact angle gradually reduced from 98.56 ° to 69.33 ° as oxidation degree of GO increased.Glass transition temperature increased by 3.11 °C with adding GOD 3,and tensile strength is maximally enlarged by 192%with adding GOD 9 as well as Tmax improves by 29.42 °C with adding GOD 15,in comparison with blank rubber.