MODIFICATION OF POLYBUTADIENE RUBBER: A REVIEW
Developments in modification of polybutadiene rubber (PBR) using various reagents and catalysts have been reviewed. Hydrogenation and functionalization occurring at the site of unsaturation along chain length are discussed. Hydrogenation involving various metal catalyzed processes is discussed. Suitable conditions that are effective during hydrogenation and functionalization are mentioned in this article. Reactivity ratios associated with microstructures of polybutadiene rubber and possible mechanisms involved are described in the review. The importance of reaction conditions during reactivity and their impact on product properties are highlighted. A specific method that needs to be adopted in order to achieve expected product properties is discussed. Various industrial applications of modified PBR and their commercial products in the global market are discussed.ABSTRACT
Silica filler and epoxidized rubber interaction mechanism.3
Hydrogenation of polybutadiene rubber in presence of catalyst.10
Different hydrogenation catalyst based on titanium.
Thermal decomposition of p-toluenesulfonyl-hydrazide (TSH) to form diimide (blue) and hydrogenation.47
End group functionalization of polybutadiene rubber via depolymerization and cross metathesis.57
Bromination of butadiene rubber followed by substitution or elimination reactions.62
Bromonium ion formation during bromination reaction.60
Electrophilic addition of chlorine to polybutadiene.64
Acid catalyzed epoxide ring opening of epoxidized polybutadiene rubber.81
Silyl based co-monomers used in 1,3 butadiene copolymerization.88
Co-monomers bearing polar groups.87
Copolymerization of allyl borane monomer and functional group introduction89
Allylboration reaction with aldehydes.89
Free radical based HTPB reaction mechanism.93
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