Properties Of ESBR Reinforced By Nanosilica Surface-modified In Situ

In this thesis,the ESBR-based nanocomposites containing different surface -modified nano-SiO₂ were prepared on a two-roll mill,and the mechanical properties, cure properties and dynamic mechanical properties of nanocomposites were investigated.In order to farther analyse more deeply the interaction between different surface-modified nano-SiO₂ and ESBR matrix during the preparation of nanocompo -sites,the extraction treatment of nanocomposites was made,and bound rubber were investigated by thermogravimetric analysis,Fourier-transform infrared spectroscopy (FTIR),and transmission electron microscopy(TEM),and the SEM micrographs of tensile fracture surfaces were also obvsered.1.DNS-2/ESBR and RNS-D/ESBR nanocomposites were prepared by mechanical mix on a two-roll.Interaction at the interface of RNS-D and ESBR matrix was analysed by investigating TG curve and FTIR spectra of extraction products.The results of mechanical testing showed that addition of reactable DNS-2 could reinforce the tensile strength and tear strength of nanocomposites,because of nano-SiO₂ bound rubber and link network which were closely correlated with silica particle and surface-modifier.2.N330/RNS-D/ESBR nanocomposites were also prepared by mechanical-mix on a two-roll.Mechanical properties,cure properties and dynamic mechanical properties also were discussed thermogravimetric analysis,Fouriertransform infrared spectroscopy (FTIR),and transmission electron microscopy(TEM),and the SEM micrographs of tensile fracture surfaces were also discussed.It was found that mechanical properties, tear strength and elongation were improved greatly with the nano-SiO₂ increasing. Scorch time(t₁₀) and optimum cure time(t₉₀) were shorten,cure characteristics became easier.Storage modulus(G′)and loss modulus(G″) reduced gradually.Vitrification temperature(Tg) and loss factor(tanδ) also reduced from high temperature to low temperature.This can be explained by the fact that small diameter and better disperse of nano-SiO₂ in N330/ESBR composites.Which markedly alleviated the friction of carbon-carbon particle.And this was one essential reason of many analysis s on this phenomenon.3.Quantity of filler played an important effect to ESBR composites' properties,it were found that tensile strength and tear strength were improved with SiO₂ filling, however,too much nano-filler reduced the mechanical properties,which would become some objections in ESBR composites.