BASIC CARBON BLACK AND SILICA DUAL-FILLER CONTROL: APPLICATION AND MECHANISM ANALYSIS IN SOLUTION POLYMERIZED STYRENE BUTADIENE RUBBER COMPOSITE MATERIALS

ABSTRACT The strengthening effect of carbon black (CB) and silica dual-filler in solution polymerized styrene butadiene rubber (SSBR) was studied. SSBR composites with different silica/CB filler ratios were prepared under the condition of constant filler amount. The vulcanization efficiency and crosslinking degree of rubber were evaluated by vulcanization experiments. The filler dispersion and network strength of rubber were comprehensively analyzed by linear and nonlinear rheological tests. The crosslinking characteristics of rubber were studied based on the tube model. The results show that the mixing of the dual filler can reduce the agglomeration between the filler particles, improve the dispersion of the filler, and improve the force between the filler and polymer molecules. The excellent dispersion and the interaction force inside the polymer improve the vulcanization degree of the rubber, and the crosslinking density of the rubber is improved. The results showed that the optimal ratio of silica to CB was 4:1. From the macro point of view, the uniaxial tensile test of vulcanizate samples was carried out, and it was found that the tensile strength, tensile stress and elastic modulus of SSBR vulcanizate were improved.