Characterization on the Microstructures of Brominated Natural Rubber from Latex-中国Betway体育网页登陆

摘要 Toelucidatethemechanismofbrominatednaturalrubber(BNR),eightBNRsampleswithdifferentbrominecontentwerepreparedfromlatexindifferentbrominationtime,andthemicrostructureswerecharacterizedbyFouriertransforminfraredspectroscopy(FTIR)and1H-NMRspectroscopy,respectively.ThehardnessofBNRincreasedanditsnaturetransformedfromelastomertoresinwiththeincreaseofbrominecontent.Unlikechlorinatednaturalrubber(CNR),FTIRshowedthattherewerenocarbonylgroupsonthemolecularchainsofBNR.1H-NMRspectroscopyrevealedthatthereactionactivityofbromineandthesecondaryhydrogenatomofBNRweremuchhigherthanthoseoftheprimaryone.ThebrominatedsubstitutiontookplaceinthehydrogenatomofCH3andCH2groupsfirstly,theninthelateperiodofbrominationthebondofC=CwastransferredtothesaturatedbondofC-CduetotheMarkovnikovadditionofhydrogenbromide.Basedonthesefindings,themechanismofBNRfromlatexcouldbededucedasafreeradicalreactionandthedetailedbrominationprocesswaspresented.

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Characterization on the Microstructures of Brominated Natural Rubber from Latex

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