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1、NBRacrylonitrile-butadieneelastomerPARAMETERUNITVALUEREFERENCESGENERALCommonnameacrylonitrilebutadieneelastomer,nitrilerubberCASname2propenenitrile,polymerwith1,3butadiene;nitrilerubberAcronymNBRCASnumber9003183;9005985HISTORYPersontodiscoverSemon,WLSemon,WL,USPatent2,380
2、,551,BFGoodrich,July31,1945.Date1941Detailspatentforcopolymerizationofbutadieneandacrylonitrileinwateremulsioninreactorcomposedofnickel,chromium,andironSYNTHESISMonomer(s)structureCH=CHCN;CH=CHCH=CH222Monomer(s)CASnumber(s)107131;106990Monomer(s)molecularweight(s)dalton,g
3、/53.06;54.09mol,amuAcrylonitrilecontent%1551FormulationexampleAC32,butadiene68,water180,PMHP0.223,FeSO.Washington,ID;Duever,TA;4Penlidis,A,J.Macromol.Sci.A,HO0.0056,SFS0.12,Dresinate1.25,Tamol2.85,247,74769,2010.mercaptan0.42MethodofsynthesisNBRisproducedbyanemulsionpolym
4、erization.Thewater,Minari,RJ;Gugliotta,LM;Vega,Jemulsifier/soap,monomers(butadieneandacrylonitrile),radiR;Meira,GR,ComputersChem.calgeneratingactivator,andotheringredientsareintroducedEng.,31,107380,2007.intothepolymerizationvessels.Theemulsionprocessyieldsapolymerlatextha
5、tiscoagulatedusingcalciumchlorideoraluminumsulfatetoformcrumbrubberthatisdriedandcompressedintobales.Numberaveragemoleculardalton,g/58,0075,000weight,Mmol,amunMassaveragemolecularweight,dalton,g/199,000600,000Mmol,amuwPolydispersity,M/M26wnSTRUCTURECrystallinity%amorphous
6、Tacticity%78(transinbutadienesegments),12(cis),10(1,2sites)COMMERCIALPOLYMERSSomemanufacturersLanxessTradenamesKrynac,BaymodNPHYSICALPROPERTIESDensityat20oCgcm-30.921.01OdorslightrubberyThermaldecompositionoC>200(beginswithexcessivehardeningduetocroisslinking)Storagetempe
7、ratureoC<35GlasstransitiontemperatureoC60to10198HANDBOOKOFPOLYMERS/Copyrights2012;ChemTecPublishingNBRacrylonitrile-butadieneelastomerPARAMETERUNITVALUEREFERENCESSpecificheatcapacityJK-1kg-10.25MaximumservicetemperatureoC45to125LongtermservicetemperatureoC40to108Hildebrand
8、solubilityparameterMPa0.517.9021.38Permeabilitytonitrogen,25oCcm3cm0.01770.189(decreaseswithacry
