Study Of The Preparation Of Silica Nanocomposites And The Properties Of Silica Nanocomposites Filled SSBR/BR

Due to the excessive use of fossil energy,energy shortage and environmental protection have become the focus of attention.As one of the main sources of energy consumption and environmental pollution,automobile industry is gradually developing towards the direction of safety,energy conservation and environmental protection.Therefore,high-performance"green tire" with high wear resistance,low rolling resistance and high wet skid resistance has become the research focus in rubber industry.At present,it is still a challenge to solve the puzzles that the poor dispersion of SiO2 nanoparticles in the rubber matrix,easy agglomeration and poor comprehensive properties of rubber composites.Therefore,a single filler including only SiO2 can not statisfy the requirements of the development of high-performance green tires.And because each component has its own characteristics and the synergistic effect between each other can further improve the rubber properties,developing new nanocomposites consisting of two or more nano-materials has become the direction of new fillers.It is greatly significant to study and prepare tire rubber composites with high wear resistance,low roll resistance and high wet skid resistance.In this paper,the interaction between components in SiO2-based nanocomposites was studied.The SiO2-based nanocomposites were incorporated with SSBR and rare earth cis-butadiene rubber(BR)to prepare the SSBR/BR composites.The effects of SiO2 nanocomposites on the mechanical properties of rubber and the effect of the interfacial interaction between filler and rubber on the dynamic properties of rubber composites was studied.In addition,the corresponding reinforcement mechanism and the synergism between the components were analyzed.The primary coverage as follows:1.SiO2 nanodots/MgAl-layered double hydroxide(SiO2/LDH)nanocomposites were prepared by in situ self-assembly method,and SiO2/LDH-SSBR/BR composites were prepared by mixing SiO2/LDH with SSBR/BR.The characterization of the structure of SiO2/LDH shows that the particle size of SiO2 nanoparticles is about 3.2 nm and the SiO2 nanodots are uniformly dispersed on the surface of LDH.Compared with commercial Zeosil 1165MP highly-dispersed nano SiO2(Zeosil 1165MP),Si02/LDH showed a more weaken filler network,and a stronger filler-rubber interaction.At the filler content of 70 phr,the value of tan 8 increased 48%at 0 ?,and decreased 62%at 60 ?,indicating that Si02/LDH-SSBR/BR possesses higher wet skid resistance and lower rolling resistance than Zeosil 1165MP-SSBR/BR.Meanwhile,the heat-build-up decreased 6.1 ?,indicating that the well dispersion of Si02/LDH in rubber matrix.2.CNTs/SiO2 nanocomposites were prepared by self-assembled method,and then CNTs/SiO2-SSBR/BR composites were prepared by mixing with SSBR/BR.The morphology of CNTs/Si02 and CNTs/SiO2-SSBR/BR were characterized and the mechanical and dynamic properties of CNTs/SiO2-SSBR/BR were studied.The characterization of the structure of CNTs/SiO2 proved the covalent bond between CNTs and SiO2.The TEM images of CNTs/SiO2-SSBR/BR show that CNTs/SiO2 was highly dispersed in rubber matrix.The SEM images showed that CNTs acted as a bridge connection in rubber deformation.The mechanical properties were increased with the increasing of CNTs weight percentage,resulting that CNTs/SiO2 has the excellent reinforcement on SSBR/BR.The heat build-up and Akron abrasion showed a certain decreasing when the weight percentage of CNTs.3.The reduced graphene oxide/SiO2(RGO/SiO2)nanocomposites were prepared by self-assembly method,and then RGO/SiO2-SSBR/BR composites were prepared by mixing with SSBR/BR.The conprehensive properties of the RGO/SiO2-SSBR/BR were studied.The synergistic dispersion mechanism between components of RGO/SiO2 nanocomposites was analyzed.A large number of SiO2 nanoparticles(particle size 10-15 nm)can be observed on the surface of RGO by TEM.The results of XPS showed the covalent bond between RGO and SiO2.The SEM of the fracture surface and the dynamic rheological properties of RGO/SiO2-SSBR/BR showed the synergistic dispersion between RGO and SiO2 with the low weight percentage of RGO.In the study of the properties of RGO/SiO2-SSBR/BR,with the increase of RGO weight percentage,the mechanical properties of RGO/SiO2-SSBR/BR composites are enhanced,and the composite possessed the optimal comprehensive properties with the weight percentage of RGO is 1%.The heat build-up showed a significant decrease with the low weight percentage of RGO,while the Akron abrasion decreased with the increasing weight percentage of RGO.