Study On Compatibility Of Acrylonitrile-butadiene Rubber/Styrene-butadiene Rubber Blends

Acrylonitrile-butadiene rubber is a kind of highly polar rubber,styrene-butadiene rubber is a non-polar rubber,two are thermodynamically incompatible,interface between two phases is difficult to produce co-crosslinking,showing micro phase separation,poor compatibility,lead to poor comprehensive performance.The compatibility depends acrylonitrile-butadiene rubber / styrene-butadiene rubber blends in two phases are key use exists,namely co-crosslinking.If the two phases produce co-crosslinking,then the compatibility will be improved,only to improve the compatibility of the two phases,phase separation can be improved,the macro performance can be improved.At first,this paper has adopted a new process,that is,two kinds of compound made of rubber and respective mother rubber mixing,parked for a period of time,produce the rubber blends.through this process,part of vulcanizing agent exists in their respective rubber phase,can prevent the vulcanization agent migration issues,due to different viscosity of rubber,ensure each component can be effective crosslinking;The other part is attached to the interface of intersecting,which may result in the co-crosslinking reaction on the phase interface.The new process is better than the traditional process by comparing the tensile test.Through the proportion of 50/50 were researched by FT-IR,crosslinking density determination,DSC,SEM.The results show that hydrogen bonding is produced at the interface between NBR/SBR blend in the new process,crosslinking density increases,co-crosslinking occurred.The two glass transition temperatures(Tg)are close to each other.rough degree increases,the crack width and height increased significantly,and scattered dense,indicating that the fracture to ductile fracture,fracture need more energy,which enhanced the interaction between two phases,the interface is more firmly combined,thus improve the compatibility of NBR/SBR blends,improve the performance.Secondly,the silane coupling agent was adopted on the basis of the new process,and the active sulfur released at high temperature was used to study whether the co-crosslinking reaction was involved in the interface.The study of the relationship between the sulfurization characteristic,glass transition temperature and micromorphology of the blends was studied bythe non-rotor foaming vulcanization instrument,DSC and SEM.The results showed that with the increase of the dosage of Si69,mooney viscosity decreased,hardness increased,tensile strength increased,the elongation decreased;the oil resistance becomes better,the crosslink density increases,the co-crosslinking occurs,and the glass transition temperature is close to each other,rough degree increases,increase of crack,indicating that the fracture to ductile fracture,fracture need more energy,which enhanced the interaction between two phases,the interface is more firmly combined,thus improve the compatibility,improve the performance.Finally,the study of the non-rotor foaming vulcanization instrument,Mooney viscometer and hot air aging box.The results show that When the dosage of ancient Malone resin was 5phr,the mechanical properties of NBR/SBR blend vulcanizates are the best;When the dosage of carbon black is 50 phr,the mechanical properties of NBR/SBR blend vulcanizates are the best;NBR/SBR blend vulcanizates is the best resistance to aging when 4010 NA is used for 1 phr.