Investigation Of Extrusion And Rheological Behavior In Filled SBR

Effect of molecular structure, filler and types of silane coupling agent on extrusion and rheological behavior was investigated in filled SBR. The extrusion viscosity-temperature dependence and extrusion viscosity-rate dependence were investigated based on it.The results showed that the integral distortion was serious for both of the two pure SBR systems, which were ESBR1712 with high 1,4-polybutadiene content and SSBR2564 A with high vinyl group content. However, the distortion was depressed obviously after being filled system, the die swelling ratio of ESBR1712 was clearer than that of SSBR2564 A, and the shear rate dependence was much more sensitive than that of SSBR2564 A. However, the extrusion stability of filled SSBR2564 A was better.The bound rubber content, apparent shearing viscosity and shearing stress of ESBR1712 were higher than that of SSBR2564 A filled with the same CB content. The“Payne effect”of filled SSBR2564 A compounds was much more obvious. It indicated that the dispersion of CB in ESBR1712 was better than that in SSBR2564 A.The result of silica filled ESBR1712 showed that the non-Newtonian performance increased with increase of silica content. The apparent shear viscosity-shearing rate dependence also increased with increased of silica content. It was found that Si747 was the best choice to modify the silica and the linear area was the longest at low deformation for investigating the effect of different types of silane coupling agent on extrusion and rheological behavior of compounds. It was found that the apparent shearing viscosity and shearing stress increased with increasing of discharging temperature by investigated the effect of discharging temperature on extrusion rheological behavior with Si69 system. It was found that the integral and surfacedistortion of extruded samples were serious with too high filler content, discharging or extruded temperatures, when the extruded samples were observed by stereo microscope.The variation amplitude of non-Newtonian ratio n decreased with increase of filler content for CNT filled compounds and the CNT was good for depressing extrusion distortion. The extrusion was sensitive to the extrusion temperature and extrusion rate, when the CNT content was less than 10 phr. However, the extrusion temperature and extrusion rate did not affect the extrusion morphology, when the CNT content was more than 10 phr.It was found that the the apparent shear viscosity, shearing stress, storage modulus,and extrusion morphology of 5phr CNT filled SBR were similar to the corresponding parameters of 20 phr CB and 20 phr silica filled systems, when the effect of CB, silica and CNT on extrusion rheology behavior of filled SBR. However, these parameters of20 phr CNT filled SBR were much higher than those of 20 phr CB and 20 phr silica filled systems and its extrusion stability was higher than that of 20 phr CB and 20 phr silica filled systems. It was the best for depressing extrusion distortion with CNT. It was the worst for depressing extrusion distortion with silica.