The Study Of A Novel Hybrid Material HNTs-silica And Its Multi-functional Supported Rubber Additives And Styrene Butadiene Rubber Composites

With the continuous development of the rubber industry,the preparation of rubber nanocomposites with high performance has become more and more important.Nowdays,the novel nano-filler,especially,nano-hybrid has sparked the interest from scientists and technologists.However,due to poor compatibility and weak interfilcial interaction between filler and rubber,the comprehensive performance of rubber composites with nanofillers(Halloysite nanotubes or Silcia)is largely decreased.To better solve these problems,the preparation of a novel nano-hybrid,which gives rise to a good synergy effect in the rubber matrix through the interfacial modification,is an important research topic.On the other hand,organic modification of inorganic nano-hybrid could have better dispersion in rubber matrix.In this work,a novel nanohybrid material HNTs-g-Silica and two novel rubber additives through the antioxidative intermediates(RT)and accelerator(M)modifying HNTs-g-Silica were prepared,respectively.That can not only significantly improve the dispersion of the hybrid filler in the rubber matrix and enhance interfical interaction hybrid with the rubber,but also can effectively solve environmental pollution due to the easy migration and volatilization of traditional low molecule rubber additives.Hence,the preparation of novel nano-hybrid and environmentally-friendly multifunctional supported rubber additives provide a new theoretical basis and research approach for the application of high-performance rubber composite.First,Silica nanoparticles were in-situ grown on the surface of halloysite nanotubes(HNTs)by a facile one-step approach to prepare a unique nano-structured hybrid(HNTs-g-Silica).The structure,morphology and composition of HNTs-g-Silica were investigated.HNTs-g-Silica was used as reinforcing filler in SBR.The dispersion of HNTs-g-Silica and the interfacial interaction between HNTs-g-Silica and SBR were systematically investigated.The results suggested that HNTs-g-Silica was uniformly dispersed in SBR matrix.Moreover,compared with HNTs or the mixture of mixed HNTs/Silica,HNTs-g-Silica could immobilize more rubber chains on its surface,manifesting a strong interfacial interaction between HNTs-g-Silica and SBR.Consequently,SBR/HNTs-g-Silica composites showed much higher mechanical strength and extensibility than SBR/HNTs/Silica or SBR/HNTs composites.Besides,the loss factor at 60 ~oC and 0 ~oC of SBR/HNTs-g-Silica composites was significantly lower and higher than that of SBR/HNTs composites,indicating SBR/HNTs-g-Silica has good dynamic mechanical properties.To further improve the interficical interaction between HNTs-g-Silica and SBR,a novel antioxidant(HS-s-RT)waspreparedbygraftingantioxidantintermediate p-aminodiphenylamine(RT)on the surface of HNTs-g-Silica(HS)via the linkage of silane coupling agent.The morphologies and rubber processing analyzer(RPA)analysis of SBR composites were studied.The results demonstrated HS modified by RT was more uniformly dispersed in SBR,and stronger interfacial interaction between HS-s-RT and SBR was formed.Consequently,compared to SBR/HS composites,the tensile strength and the stress of 100%and 300%strain of SBR/HS-s-RT were increased.At the same time,SBR/HS-s-RT composites have low rolling resistance.Furthermore,it was found that HS-s-RT can effectively improve the anti-aging of SBR composites than corresponding low molecular-weight antioxidant N-isopropyl-N'-phenyl-4-phenylenediamin(4010NA).A novel accelerator(HS-s-M)was fabricated by grafting accelerator M on the surface of HS.The effect of immobilized accelerator HS-s-M on structure and properties for SBR composites was studied.It's suggested that the good dispersion of HS-s-M weakened the filler-filler network,and SBR/HS-s-M showed the weaker Payne effect and better processibility than SBR/HS composites.The strong interfacial interaction between SBR and HS-s-M endowed SBR/HS-s-M composites with the thick immobilized polymer layer and large cross-linking density,furthermore decreasing the activation energy of vulcanization.Therefore,SBR/HS-s-M composites have excellent sulfurization property and great mechanical perfomance.