Preparation Of Modified Graphite Oxide And Its Application In Ssbr

Graphene oxide(GO)is derivant of graphene.It has some outstanding physical and chemical properties,such as high aspect ratio,high modulus,and it has oxygen-containing functional groups such as hydroxyl,carboxyl and epoxy groups on the surface of the sheet,which improves the dispersion in solvents.GO can be used as a new nano-filler in composites.In this paper,We have been studied different methods of preparing modified graphene oxide.The effects of different modification methods on the comprehensive properties of the nanocomposites were studied,and the relationship between the structure of graphene oxide and the properties of the nanocomposites was discussed.The main content of this paper is as follows:(1)Microwave reduction of graphene oxide(MEGO)was obtained by microwave treatment of graphene oxide,and the effect of filling fraction of graphene oxide on the properties of SSBR composites was studied.XRD,FTIR,Raman and SEM tests show that when the microwave treatment time is 3 minutes,the structure is complete and the conductivity is high.3 minutes is the best time.MEGO was modified by Si69 and MEGO was added into SSBR by mechanical blending.MEGO/SSBR composites were prepared.The results show that MEGO can improve the mechanical strength of SSBR,mainly by increasing its specific surface area,increasing the contact surface with rubber,achi eVing uniform dispersion of fillers in rubber and improving the interfacial bonding force with rubber.NVhen the content of MEGO is 3 phr,the strength reaches the maximum,the temperature rise is the lowest and the thermal stability is good.(2)Urea-modified graphene oxide was prepared by grinding load and calcining at high temperature under nitrogen atmosphere.Nitrogen-doped graphene g-C3N4/rGO(MGO)was obtained.MGO was modified by Si69 and MGO/SSBR composite was prepared by mechanical blending.The results of SEM,XPS,FTIR and XRD show that the vibration absorption peaks of C-N and C=N on g-C3N4 heterocycles appear in FTIR,and GO is partly reduced.XRID analysis shows that the spacing between layers decreases and the g-C3N4/rGO material is successfully prepared.The physical and mechanical properties and dynamic mechanical properties of the composites can be improved by replacing white carbon black with MGO equivalently.As a result,the interaction between nitrogen-containing groups at the edge of MGO and silica is strengthened,which is more conducive to the dispersion of fillers.When the content of MGO is 5 phr,the composite has the best comprehensive physical properties,the lowest rolling resistance,the lowest temperature rise and the lowest compression deformation rate.