Abstract
The mechanical properties of a brominated radial styrene–butadiene (SBS) and a linear styrene isoprene (SIS) block copolymer are investigated as a function of bromination level. The brominated SBS has been investigated by dynamic mechanical analysis (DMA). The mechanical properties of brominated styrene diene block copolymers indicate that the central (polyisoprene or polybutadiene) soft block loses some elasticity becoming harder. On the other hand, the miscibility of polystyrene hard blocks with the central soft blocks increases with increasing degree of soft block bromination. Consequently, mainly the tensile strength and the true tensile strength decrease with increasing bromine content. Bromination affects the mechanical properties of the SIS material more than those of the SBS.
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