Study On Tensile Induced Crystallization Behavior Of Crystalline Rubber/Organic Clay Nanocomposites

The research on the theory and technology development of rubber material’s performance enhancement has always been one of the core problems in this field.The addition of organic clay can effectively enhance the properties of rubber,and the tensile-induced crystallization of rubber composites is the main embodiment of the self-reinforcing behavior of crystalline rubber.Therefore,it is of great significance to study crystalline rubber/organic clay nanocomposites and their tensile induced crystallization behavior.The mechanical properties of crystalline rubber/organic clay nanocomposites with intercalated structure and the dependence of tensile induced crystallization behavior on the number and rate of pre-cycle stretching and the content of organic clay were studied.The main conclusions are as follows :(1)Organic clay can effectively improve the mechanical properties of rubber nanocomposites,that it is better than pure rubber.And organic clay has the best value,at this time the tensile strength of the composite is the largest;(2)The change rule of mechanical properties of three kinds of crystalline rubber nanocomposites is similar: within the change of certain organic clay content,the tensile strength increases first and then decreases,and the change of stress-strain curve shows that there will be a critical mutation point in the tensile process.Moreover,with the increase of clay content,the tensile induced crystallization behavior of rubber nanocomposites will take place rapidly under low strain;(3)Under the condition of changing the pre cycle drawing ratio and pre cycle drawing times,the nrcns,ircns and crcns will take place at high strain,but at low strain,the ircns will take place at low strain.After the pre cyclic stretching,the tensile strength of the composites will change with the change of the internal structure,even if the composites are oriented and crystallized in advance,but the constant tensile stress will decrease with the change of the non cyclic stretching.(4)In biaxial tensile test,when theorganic clay content is 8 phr,it has the highest magnitude relative to birefringence.The filler particles can give hardening effect,make the internal molecular chain extend directionally,and the structure tends to be relatively stable,so as to maximize the effect of strain induced crystallization under synchronous biaxial tension.