Studies have been made on differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and dynamic mechanical
analysis (DMA) of binary blends of isobutylene-isoprene (IIR) copolymer and polychloroprene (CR) elastomers. Blends of IIR
and CR are incompatible and showed separateTg peaks in DSC curves similar to Tanδ peaks. However, addition of chlorinated polyethylene (CM) elastomer, as compatibilizer,
imparts miscibility between IIR and CR which could be judged both through DSC as well as by dynamic loss measurements (Loss
modulusE″ and Tanδ). The storage modulus (E′) showed variation of stiffness due to structural changes associated with the addition of compatibilizer. TG plots for these
blends showed improvement of thermal stability both by addition of a suitable compatibilizer as well as due to formation of
crosslinked structures associated with the vulcanization of the blends by standard curative package.