PAPER CANCELLED: Characterization of Brominated Natural Rubber By Solution State 2D NMR Spectroscopy
In the present work, an attempt to characterize brominated natural rubber was carried out. Natural rubber, deproteinized with urea and surfactant, was brominated using N-bromosuccinimide (NBS) in a dichloromethane solution of the rubber. The amount of NBS controlled the bromine content. The resulting brominated natural rubber was characterized by 1D and 2D-NMR spectroscopy. Small signals were assigned to CH2 and CH3 groups linking to bromine atom. Cis-trans isomerization of isoprene units was found to take place during bromination of natural rubber with NBS.