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Synthesis of Bromobutyl Rubber: Effect of Reaction Temperature and Time on Bromobutyl Rubber Microstructure

Saurabh Tiwari, Virendrakumar Gupta

Abstract


Butyl rubber is prepared by cationic polymerization process either by solution or slurry phase by randomly copolymerizing isobutylene with small amount of isoprene (1-3 mol %). It has good air impermeability and oxidative stability and thus finds extensive use in inner tube applications. The presence of unsaturation in the form of isoprene units in butyl rubber provides a means of enhancing useful properties of this important commodity elastomer by incorporation of reactive functionality such as bromine by post-polymerization chemical modification of butyl rubber. There is a need of butyl rubber with ionic pendants which will impart compatibility of these elastomers with various other non-carbon black fillers for applications requiring higher mechanical properties and impermeability. Effect of reaction temperature and time as well as effect of controlled addition of bromine on bromobutyl rubber microstructure is studied in detail. Controlled addition of bromine shows 75-87% endo isomer which is similar to fast addition of bromine to butyl rubber. Further, microstructure of product bromobutyl rubber is seen to be independent of reaction temperature (55-62 ℃) and reaction time (1-4 min). Effect of mixture of hexane and water on microstructure properties of bromobutyl rubber was also studied in detail.


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