Research On The Physical An Dynamic Mechanical Properties Of Cb/SiO₂Filled SSBR

As far as SSBR (solution polymerized styrene-butadiene rubber) is concerned, it is owing to the character of no impurities and narrow molecular weight distribution that results in excellent performance in the tire tread application. It is necessary for such reinforcing filler as carbon black (CB) and silica to be applied in the SSBR which is of non self-reinforced rubber. The silica which has been in-situ modified by such coupling agent as Si69can play more vital roles in rubber products than CB used widely in rubber fields. In this paper, it was mainly discussed that the physical mechanical and dynamic viscoelastic properties on SSBR filled with CB and silica separately.In CB filled SSBR, the mechanical and dynamic properties of composites were analysed mainly by the specific surface ratio and structure degrees of CB. BL carbon black with high structure degree could endow the vulcanizates with great mechanical properties. Besides, it was just the high structure degree of BL that brought about high loss and storage modulus in the dynamic strain and frequency sweeping, and this character leaded to lower tanSat0℃in the temperature sweeping using DMTA, which brought the tire bad wet skid resistance.In silica filled SSBR, it is very difficult for silica to be dispersed in such polymer as SSBR for the high structure degree. On the contrary, the modified silica by using Si69dispersed more easily. In the compounds with no Si69, most junctions of network were rigid, and stress softening and Payne effect were evident during the process of strain sweeping. After in-situ modification with Si69, the network junction was flexible, which blocked the filler partical themodynamical movement and restrained further agglomeration during the time sweeping.In the SSBR filled with silica and CB, the dynamic viscoelastic properties of the compounds with different ratio of silica to CB were investigated using RPA and DMTA in the different sweeping pattern. In this part, the constitutes of Payne effect were redefined, and it was studied that how factors including time interval and pressure influenced the filler agglomeration during the process of strain sweeping.