| Rubber/clay nanocomposites have attracted widespread attention.The commonly used melt blending,solution blending and latex compounding have some problems,such as high price and the use of organic solvents.Therefore,it is of great significance to develop a new method for preparing rubber/clay nanocomposites with low cost,environmental friendliness and industrial application prospect.In this study,because different proportions of clay dispersed differently in water,a novel method named gel compounding method was utilized to prepare acrylonitrile-butadiene rubber(NBR)/clay and ethylene propylene diene monomer(EPDM)/clay nanocomposites.Clay gels were prepared according to the different dispersive forms of clay in water.The XRD results showed that the clay layer spacing widened and dispersed in the form of sheets and thin layers in rubber matrix,indicating the formation of isolated structure.The tensile strength of NBR/clay nanocomposite was the most significant,which reached 13.7 MPa,more than 218%higher than that of pure NBR.The tensile strength of EPDM/clay nanocomposite reached 5.8 MPa.Compared with pure EPDM,the tensile strength of EPDM/clay nanocomposite increased 346%,and the elongation at break increased about 100%.In addition,the rubber/quaternary ammonium salt-modified clay nanocomposite was prepared with gel compounding.The XRD results showed that the layer spacing of clay was further expanded,which indicated that the modified clay had better dispersion effect.However,the viscosity of modified clay gel reduced,this was not beneficial for mechanical compounding using shear force.Moreover,there were a large number small bubbles in clay gel,which remained in the rubber as defects and reduced the mechanical properties.The optimal tensile strength of NBR/quaternary ammonium salt-modified clay and EPDM/quaternary ammonium salt-modified clay nanocomposites was 6.6 MPa and 3.4 MPa,which was better than pure rubber,but did not further improve founded on unmodified clay gel. |
PDF Full Text Request