Study On The Correlation Between SSBR's Structure & Properties And Rolling Resistance Of Tire

The microcosmic structure of SSBR SL563, 3830, 4850, HP350, HP355 and 5025-2 were studied by means of Fourier Transform Infrared Spectrometer (FTIR), Nuclear Magnetic Resonance (NMR), Differential Scanning Calorimeter (DSC) and Gel Permeation Chromatography (GPC). On the basis of fundamental formula and practical formula, the correlation between structure and properties of different SSBR were investigated by conventional mechanical properties, dynamic compression heat build-up as well as dynamic mechanical analysis (RPA, DMTS), and according to that optimize the best rubber materials with better wet traction and lower rolling resistance. The effects of blending ratio of the selected SSBR and BR9000 on the static and dynamic properties of rubber was studied to find out the optimal blending ratio, then basing on that, TDAE oil content, Naphthenic oil content, Silica varieties and content that had a bearing on the mechanical properties, dynamic compression heat build-up as well as dynamic mechanical property of Silica reinforced SSBR/BR blends were investigated.The experimental results showed that SSBR SL563 was tin-coupled rubber, HP350 and HP355 had silicon-coupled structure, 3830, 4850 and 5025-2 were oil extended SSBR; among them, SSBR 5025-2 had the highest content of vinyl, 4850 had the highest level of styrene, 3830 possessed the highest level of 1,4-strucure content. The glass transition temperature (Tg) of SL563 was the lowest, 3830's molecular weight was the highest of all. Mooney viscosity of SL563 was the highest, but that of 4850 was minimum. In the Carbon black reinforced vulcanizates, tin-coupled SL563 vulcanizate had a good balance between static and dynamic mechanical properties. In the Silica reinforced vulcanizates, silicon-coupled HP355 vulcanizate showed better static and dynamic properties. The mechanical properties of end-coupled rubber was better than the no-coupled one, it also had higher rebound resilience, lower heat build-up and better abrasion resistance. Vulcanizates of Silicon-coupled SSBR HP350 and HP355 had weak Payne effect. HP355 had better wet traction and lower rolling resistance.It was also indicated that at the blending ratio of 75/25, the HP355/BR9000 blends had better static and dynamic properties , minimum compression heat build-up and lower tanδat 60℃which meant lower rolling resistance of tire tread.With the increase of the BR9000 content, the rebound resilience of blends was improved while the hardness and Akron abrasion loss of vulcanizates increased.In the experiment, Mooney viscosity of HP355/BR9000 compounds decreased gradually with the increase of oil content,processing property was improved. At the same time, the rebound resilience increased while the hardness, compression heat build-up and Payne effect of Vulcanizates reduced. With the increase of TDAE oil content, both the wet traction and rolling resistance were improved. In the case of the same oil content, the naphthenic oil filled vulcanizates had lower dynamic loss at 60℃than that of TDAE oil extended, it meant that naphthenic oil filled vulcaniaztes exhibited lower rolling resistance.Compared with 175Gr and 1165Mp, Silica 1115Mp reinforced vulcanizates had lower compression heat build-up and higher rebound resilience at the same amount of silica. Meanwhile, Payne effect of vulcanizate became stronger with the increase of specific surface area. The results indicated that Silica 1115Mp reinforced vulcanizate showed higher wet traction and lower rolling resistance.