Study On Structure And Gas Barrier Performance Of Functionalized Graphene Oxide/emulsion Styrene-butadiene Rubber Composites

The gas barrier performance of the tire inner liner has a great influence on the rolling resistance and tire wear of the tire.Therefore,it is very important to research the gas barrier performance of the nanofiller/rubber composites.As a nanofiller,graphene oxide(GO)has excellent gas barrier performance,except mechanical property,electrical conductivity,thermal conductivity.However,the large specific surface area the strong van der Waals force and the ?-? conjugate of GO sheetslead to the irreversible agglomeration between GO sheets.Achieving good dispersion of GO in the rubber matrix and improving the graphene-rubber interface are the key to preparing high performance graphene oxide/rubber composites.Hence,the modification of GO and the structure and properies of GO/emulsion styrene-butadiene rubber composite(GO/SBR)were investigated in this thesis.The main contents are as follows:(1)Sodium dodecyl benzene sulfonate(SDBS)and sodium polystyrene sulfonate(PSS),as the interfacial agents,were used to improvethe dispersion of GO,and amino-based silane coupling agent ?-aminopropyltriethoxysilane(KH550)was used to modified GO.KH550-GO/SDBS/SBR and KH550-GO/PSS/SBR composites were prepared.The results showed that KH550-GO/SDBS/SBR composites had a stronger filler network structure than KH550-GO/PSS/SBR composites,resulting into higher tensile strength but lower tensile strength and tear strength of KH550-GO/SDBS/SBR composites.In terms of gas barrier performance,SDBS was more helpful to the dispersion of KH550-GO in rubber than PSS.The well-dispersed GO prolonged the diffusion path of gas molecules.KH550-GO/SDBS/SBR composites had better gas barrier performance.(2)GO was chemically functionalized with an aliphatic amine octadecylamine(ODA)to obtain ODA-GOwhich was compounded with styrene-butadiene latex.The ODA-GO/SBR mixture was flocculated with different flocculants(concentrated sulfuric acid and calcium chloride)to obtain HOD A-GO/SBR composite and CaODA-GO/SBR composite.The results showed that HODA-GO had a good dispersion in SBR and formed a strong filler network.HODA-GO had a certain degree of orientation in the SBR matrix.The 100%and 300%modulus of the composites increased with the increase of the amount of graphene.The gas barrier performance of HODA-GO/SBR composites was generally improved compared with that of CaODA-GO/SBR composites.Futhermore,the sulfur content was increased to change the cross-linking network of the composites.It was found that the cross-linking density of the composites increased with the increase of sulfur content,and the gas barrier performance of HODA-GO was further improved.(3)The GO/SBR was modified by sulfonium-based silane coupling agent ?-mercaptopropyltrimethoxysilane(KH580),and the effect of addition of to KH580 on the properties of GO/SBR composites was investigated.The results showed that the GO dispersion was uniform in the composite due to the pre-flocculation of GO and SBR.The addition of KH580 enhanced the interfacial interaction between GO and SBR,and the cross-linking network of the composites was enhanced,leading to the improved mechanical properties and gas barrier performance...